v3.26.1
Shareholder Report, Holdings (Details)
Apr. 30, 2026
American Funds® College 2042 Fund - Class 529-A | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 47.00%
American Funds® College 2042 Fund - Class 529-A | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 39.00%
American Funds® College 2042 Fund - Class 529-A | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.00%
American Funds® College 2042 Fund - Class 529-A | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.00%
American Funds® College 2042 Fund - Class 529-A | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [1]
American Funds® College 2042 Fund - Class 529-C | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 47.00%
American Funds® College 2042 Fund - Class 529-C | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 39.00%
American Funds® College 2042 Fund - Class 529-C | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.00%
American Funds® College 2042 Fund - Class 529-C | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.00%
American Funds® College 2042 Fund - Class 529-C | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [1]
American Funds® College 2042 Fund - Class 529-E | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 47.00%
American Funds® College 2042 Fund - Class 529-E | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 39.00%
American Funds® College 2042 Fund - Class 529-E | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.00%
American Funds® College 2042 Fund - Class 529-E | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.00%
American Funds® College 2042 Fund - Class 529-E | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [1]
American Funds® College 2042 Fund - Class 529-T | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 47.00%
American Funds® College 2042 Fund - Class 529-T | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 39.00%
American Funds® College 2042 Fund - Class 529-T | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.00%
American Funds® College 2042 Fund - Class 529-T | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.00%
American Funds® College 2042 Fund - Class 529-T | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [1]
American Funds® College 2042 Fund - Class 529-F-1 | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 47.00%
American Funds® College 2042 Fund - Class 529-F-1 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 39.00%
American Funds® College 2042 Fund - Class 529-F-1 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.00%
American Funds® College 2042 Fund - Class 529-F-1 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.00%
American Funds® College 2042 Fund - Class 529-F-1 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [1]
American Funds® College 2042 Fund - Class 529-F-2 | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 47.00%
American Funds® College 2042 Fund - Class 529-F-2 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 39.00%
American Funds® College 2042 Fund - Class 529-F-2 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.00%
American Funds® College 2042 Fund - Class 529-F-2 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.00%
American Funds® College 2042 Fund - Class 529-F-2 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [1]
American Funds® College 2042 Fund - Class 529-F-3 | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 47.00%
American Funds® College 2042 Fund - Class 529-F-3 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 39.00%
American Funds® College 2042 Fund - Class 529-F-3 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.00%
American Funds® College 2042 Fund - Class 529-F-3 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 6.00%
American Funds® College 2042 Fund - Class 529-F-3 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [1]
American Funds® College 2039 Fund - Class 529-A | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 34.00%
American Funds® College 2039 Fund - Class 529-A | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 36.00%
American Funds® College 2039 Fund - Class 529-A | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.00%
American Funds® College 2039 Fund - Class 529-A | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 20.00%
American Funds® College 2039 Fund - Class 529-A | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [1]
American Funds® College 2039 Fund - Class 529-C | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 34.00%
American Funds® College 2039 Fund - Class 529-C | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 36.00%
American Funds® College 2039 Fund - Class 529-C | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.00%
American Funds® College 2039 Fund - Class 529-C | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 20.00%
American Funds® College 2039 Fund - Class 529-C | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [1]
American Funds® College 2039 Fund - Class 529-E | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 34.00%
American Funds® College 2039 Fund - Class 529-E | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 36.00%
American Funds® College 2039 Fund - Class 529-E | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.00%
American Funds® College 2039 Fund - Class 529-E | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 20.00%
American Funds® College 2039 Fund - Class 529-E | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [1]
American Funds® College 2039 Fund - Class 529-T | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 34.00%
American Funds® College 2039 Fund - Class 529-T | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 36.00%
American Funds® College 2039 Fund - Class 529-T | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.00%
American Funds® College 2039 Fund - Class 529-T | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 20.00%
American Funds® College 2039 Fund - Class 529-T | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [1]
American Funds® College 2039 Fund - Class 529-F-1 | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 34.00%
American Funds® College 2039 Fund - Class 529-F-1 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 36.00%
American Funds® College 2039 Fund - Class 529-F-1 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.00%
American Funds® College 2039 Fund - Class 529-F-1 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 20.00%
American Funds® College 2039 Fund - Class 529-F-1 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [1]
American Funds® College 2039 Fund - Class 529-F-2 | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 34.00%
American Funds® College 2039 Fund - Class 529-F-2 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 36.00%
American Funds® College 2039 Fund - Class 529-F-2 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.00%
American Funds® College 2039 Fund - Class 529-F-2 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 20.00%
American Funds® College 2039 Fund - Class 529-F-2 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [1]
American Funds® College 2039 Fund - Class 529-F-3 | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 34.00%
American Funds® College 2039 Fund - Class 529-F-3 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 36.00%
American Funds® College 2039 Fund - Class 529-F-3 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.00%
American Funds® College 2039 Fund - Class 529-F-3 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 20.00%
American Funds® College 2039 Fund - Class 529-F-3 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [1]
American Funds® College 2036 Fund - Class 529-A | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.00%
American Funds® College 2036 Fund - Class 529-A | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 38.00%
American Funds® College 2036 Fund - Class 529-A | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
American Funds® College 2036 Fund - Class 529-A | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.00%
American Funds® College 2036 Fund - Class 529-A | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 34.00%
American Funds® College 2036 Fund - Class 529-A | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [1]
American Funds® College 2036 Fund - Class 529-C | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.00%
American Funds® College 2036 Fund - Class 529-C | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 38.00%
American Funds® College 2036 Fund - Class 529-C | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
American Funds® College 2036 Fund - Class 529-C | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.00%
American Funds® College 2036 Fund - Class 529-C | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 34.00%
American Funds® College 2036 Fund - Class 529-C | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [1]
American Funds® College 2036 Fund - Class 529-E | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.00%
American Funds® College 2036 Fund - Class 529-E | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 38.00%
American Funds® College 2036 Fund - Class 529-E | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
American Funds® College 2036 Fund - Class 529-E | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.00%
American Funds® College 2036 Fund - Class 529-E | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 34.00%
American Funds® College 2036 Fund - Class 529-E | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [1]
American Funds® College 2036 Fund - Class 529-T | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.00%
American Funds® College 2036 Fund - Class 529-T | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 38.00%
American Funds® College 2036 Fund - Class 529-T | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
American Funds® College 2036 Fund - Class 529-T | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.00%
American Funds® College 2036 Fund - Class 529-T | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 34.00%
American Funds® College 2036 Fund - Class 529-T | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [1]
American Funds® College 2036 Fund - Class 529-F-1 | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.00%
American Funds® College 2036 Fund - Class 529-F-1 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 38.00%
American Funds® College 2036 Fund - Class 529-F-1 | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
American Funds® College 2036 Fund - Class 529-F-1 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.00%
American Funds® College 2036 Fund - Class 529-F-1 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 34.00%
American Funds® College 2036 Fund - Class 529-F-1 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [1]
American Funds® College 2036 Fund - Class 529-F-2 | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.00%
American Funds® College 2036 Fund - Class 529-F-2 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 38.00%
American Funds® College 2036 Fund - Class 529-F-2 | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
American Funds® College 2036 Fund - Class 529-F-2 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.00%
American Funds® College 2036 Fund - Class 529-F-2 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 34.00%
American Funds® College 2036 Fund - Class 529-F-2 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [1]
American Funds® College 2036 Fund - Class 529-F-3 | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 14.00%
American Funds® College 2036 Fund - Class 529-F-3 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 38.00%
American Funds® College 2036 Fund - Class 529-F-3 | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
American Funds® College 2036 Fund - Class 529-F-3 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.00%
American Funds® College 2036 Fund - Class 529-F-3 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 34.00%
American Funds® College 2036 Fund - Class 529-F-3 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [1]
American Funds College 2033 Fund® - Class 529-A | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
American Funds College 2033 Fund® - Class 529-A | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 27.00%
American Funds College 2033 Fund® - Class 529-A | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.00%
American Funds College 2033 Fund® - Class 529-A | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.00%
American Funds College 2033 Fund® - Class 529-A | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 50.00%
American Funds College 2033 Fund® - Class 529-A | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [1]
American Funds College 2033 Fund® - Class 529-C | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
American Funds College 2033 Fund® - Class 529-C | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 27.00%
American Funds College 2033 Fund® - Class 529-C | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.00%
American Funds College 2033 Fund® - Class 529-C | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.00%
American Funds College 2033 Fund® - Class 529-C | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 50.00%
American Funds College 2033 Fund® - Class 529-C | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [1]
American Funds College 2033 Fund® - Class 529-E | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
American Funds College 2033 Fund® - Class 529-E | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 27.00%
American Funds College 2033 Fund® - Class 529-E | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.00%
American Funds College 2033 Fund® - Class 529-E | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.00%
American Funds College 2033 Fund® - Class 529-E | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 50.00%
American Funds College 2033 Fund® - Class 529-E | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [1]
American Funds College 2033 Fund® - Class 529-T | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
American Funds College 2033 Fund® - Class 529-T | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 27.00%
American Funds College 2033 Fund® - Class 529-T | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.00%
American Funds College 2033 Fund® - Class 529-T | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.00%
American Funds College 2033 Fund® - Class 529-T | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 50.00%
American Funds College 2033 Fund® - Class 529-T | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [1]
American Funds College 2033 Fund® - Class 529-F-1 | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
American Funds College 2033 Fund® - Class 529-F-1 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 27.00%
American Funds College 2033 Fund® - Class 529-F-1 | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.00%
American Funds College 2033 Fund® - Class 529-F-1 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.00%
American Funds College 2033 Fund® - Class 529-F-1 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 50.00%
American Funds College 2033 Fund® - Class 529-F-1 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [1]
American Funds College 2033 Fund® - Class 529-F-2 | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
American Funds College 2033 Fund® - Class 529-F-2 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 27.00%
American Funds College 2033 Fund® - Class 529-F-2 | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.00%
American Funds College 2033 Fund® - Class 529-F-2 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.00%
American Funds College 2033 Fund® - Class 529-F-2 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 50.00%
American Funds College 2033 Fund® - Class 529-F-2 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [1]
American Funds College 2033 Fund® - Class 529-F-3 | Growth funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
American Funds College 2033 Fund® - Class 529-F-3 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 27.00%
American Funds College 2033 Fund® - Class 529-F-3 | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 13.00%
American Funds College 2033 Fund® - Class 529-F-3 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.00%
American Funds College 2033 Fund® - Class 529-F-3 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 50.00%
American Funds College 2033 Fund® - Class 529-F-3 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [1]
American Funds College 2030 Fund® - Class 529-A | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 17.00%
American Funds College 2030 Fund® - Class 529-A | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.00%
American Funds College 2030 Fund® - Class 529-A | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.00%
American Funds College 2030 Fund® - Class 529-A | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 66.00%
American Funds College 2030 Fund® - Class 529-A | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [1]
American Funds College 2030 Fund® - Class 529-C | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 17.00%
American Funds College 2030 Fund® - Class 529-C | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.00%
American Funds College 2030 Fund® - Class 529-C | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.00%
American Funds College 2030 Fund® - Class 529-C | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 66.00%
American Funds College 2030 Fund® - Class 529-C | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [1]
American Funds College 2030 Fund® - Class 529-E | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 17.00%
American Funds College 2030 Fund® - Class 529-E | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.00%
American Funds College 2030 Fund® - Class 529-E | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.00%
American Funds College 2030 Fund® - Class 529-E | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 66.00%
American Funds College 2030 Fund® - Class 529-E | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [1]
American Funds College 2030 Fund® - Class 529-T | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 17.00%
American Funds College 2030 Fund® - Class 529-T | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.00%
American Funds College 2030 Fund® - Class 529-T | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.00%
American Funds College 2030 Fund® - Class 529-T | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 66.00%
American Funds College 2030 Fund® - Class 529-T | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [1]
American Funds College 2030 Fund® - Class 529-F-1 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 17.00%
American Funds College 2030 Fund® - Class 529-F-1 | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.00%
American Funds College 2030 Fund® - Class 529-F-1 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.00%
American Funds College 2030 Fund® - Class 529-F-1 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 66.00%
American Funds College 2030 Fund® - Class 529-F-1 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [1]
American Funds College 2030 Fund® - Class 529-F-2 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 17.00%
American Funds College 2030 Fund® - Class 529-F-2 | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.00%
American Funds College 2030 Fund® - Class 529-F-2 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.00%
American Funds College 2030 Fund® - Class 529-F-2 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 66.00%
American Funds College 2030 Fund® - Class 529-F-2 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [1]
American Funds College 2030 Fund® - Class 529-F-3 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 17.00%
American Funds College 2030 Fund® - Class 529-F-3 | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.00%
American Funds College 2030 Fund® - Class 529-F-3 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 8.00%
American Funds College 2030 Fund® - Class 529-F-3 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 66.00%
American Funds College 2030 Fund® - Class 529-F-3 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [1]
American Funds College 2027 Fund® - Class 529-A | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.00%
American Funds College 2027 Fund® - Class 529-A | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
American Funds College 2027 Fund® - Class 529-A | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
American Funds College 2027 Fund® - Class 529-A | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 83.00%
American Funds College 2027 Fund® - Class 529-A | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [1]
American Funds College 2027 Fund® - Class 529-C | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.00%
American Funds College 2027 Fund® - Class 529-C | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
American Funds College 2027 Fund® - Class 529-C | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
American Funds College 2027 Fund® - Class 529-C | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 83.00%
American Funds College 2027 Fund® - Class 529-C | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [1]
American Funds College 2027 Fund® - Class 529-E | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.00%
American Funds College 2027 Fund® - Class 529-E | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
American Funds College 2027 Fund® - Class 529-E | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
American Funds College 2027 Fund® - Class 529-E | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 83.00%
American Funds College 2027 Fund® - Class 529-E | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [1]
American Funds College 2027 Fund® - Class 529-T | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.00%
American Funds College 2027 Fund® - Class 529-T | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
American Funds College 2027 Fund® - Class 529-T | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
American Funds College 2027 Fund® - Class 529-T | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 83.00%
American Funds College 2027 Fund® - Class 529-T | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [1]
American Funds College 2027 Fund® - Class 529-F-1 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.00%
American Funds College 2027 Fund® - Class 529-F-1 | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
American Funds College 2027 Fund® - Class 529-F-1 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
American Funds College 2027 Fund® - Class 529-F-1 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 83.00%
American Funds College 2027 Fund® - Class 529-F-1 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [1]
American Funds College 2027 Fund® - Class 529-F-2 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.00%
American Funds College 2027 Fund® - Class 529-F-2 | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
American Funds College 2027 Fund® - Class 529-F-2 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
American Funds College 2027 Fund® - Class 529-F-2 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 83.00%
American Funds College 2027 Fund® - Class 529-F-2 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [1]
American Funds College 2027 Fund® - Class 529-F-3 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.00%
American Funds College 2027 Fund® - Class 529-F-3 | Equity-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
American Funds College 2027 Fund® - Class 529-F-3 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
American Funds College 2027 Fund® - Class 529-F-3 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 83.00%
American Funds College 2027 Fund® - Class 529-F-3 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [1]
American Funds College Enrollment Fund® - Class 529-A | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.00%
American Funds College Enrollment Fund® - Class 529-A | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
American Funds College Enrollment Fund® - Class 529-A | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 86.00%
American Funds College Enrollment Fund® - Class 529-A | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [1]
American Funds College Enrollment Fund® - Class 529-C | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.00%
American Funds College Enrollment Fund® - Class 529-C | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
American Funds College Enrollment Fund® - Class 529-C | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 86.00%
American Funds College Enrollment Fund® - Class 529-C | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [1]
American Funds College Enrollment Fund® - Class 529-E | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.00%
American Funds College Enrollment Fund® - Class 529-E | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
American Funds College Enrollment Fund® - Class 529-E | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 86.00%
American Funds College Enrollment Fund® - Class 529-E | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [1]
American Funds College Enrollment Fund® - Class 529-T | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.00%
American Funds College Enrollment Fund® - Class 529-T | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
American Funds College Enrollment Fund® - Class 529-T | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 86.00%
American Funds College Enrollment Fund® - Class 529-T | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [1]
American Funds College Enrollment Fund® - Class 529-F-1 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.00%
American Funds College Enrollment Fund® - Class 529-F-1 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
American Funds College Enrollment Fund® - Class 529-F-1 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 86.00%
American Funds College Enrollment Fund® - Class 529-F-1 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [1]
American Funds College Enrollment Fund® - Class 529-F-2 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.00%
American Funds College Enrollment Fund® - Class 529-F-2 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
American Funds College Enrollment Fund® - Class 529-F-2 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 86.00%
American Funds College Enrollment Fund® - Class 529-F-2 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [1]
American Funds College Enrollment Fund® - Class 529-F-3 | Growth-and-income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 9.00%
American Funds College Enrollment Fund® - Class 529-F-3 | Balanced funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
American Funds College Enrollment Fund® - Class 529-F-3 | Fixed income funds [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 86.00%
American Funds College Enrollment Fund® - Class 529-F-3 | Other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.00% [1]
[1] Less than 1%.