v3.26.1
Shareholder Report, Holdings (Details)
Mar. 31, 2026
American High-Income Trust - Class A | U.S. corporate bonds & notes [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 74.17%
American High-Income Trust - Class A | Corporate bonds & notes of issuers outside the U.S. [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.57%
American High-Income Trust - Class A | Loans [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
American High-Income Trust - Class A | Other bonds, notes & debt instruments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.08%
American High-Income Trust - Class A | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.95%
American High-Income Trust - Class A | Other Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.47%
American High-Income Trust - Class A | Short-term securities & other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.16% [1]
American High-Income Trust - Class C | U.S. corporate bonds & notes [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 74.17%
American High-Income Trust - Class C | Corporate bonds & notes of issuers outside the U.S. [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.57%
American High-Income Trust - Class C | Loans [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
American High-Income Trust - Class C | Other bonds, notes & debt instruments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.08%
American High-Income Trust - Class C | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.95%
American High-Income Trust - Class C | Other Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.47%
American High-Income Trust - Class C | Short-term securities & other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.16% [1]
American High-Income Trust - Class T | U.S. corporate bonds & notes [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 74.17%
American High-Income Trust - Class T | Corporate bonds & notes of issuers outside the U.S. [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.57%
American High-Income Trust - Class T | Loans [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
American High-Income Trust - Class T | Other bonds, notes & debt instruments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.08%
American High-Income Trust - Class T | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.95%
American High-Income Trust - Class T | Other Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.47%
American High-Income Trust - Class T | Short-term securities & other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.16% [1]
American High-Income Trust - Class F-1 | U.S. corporate bonds & notes [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 74.17%
American High-Income Trust - Class F-1 | Corporate bonds & notes of issuers outside the U.S. [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.57%
American High-Income Trust - Class F-1 | Loans [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
American High-Income Trust - Class F-1 | Other bonds, notes & debt instruments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.08%
American High-Income Trust - Class F-1 | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.95%
American High-Income Trust - Class F-1 | Other Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.47%
American High-Income Trust - Class F-1 | Short-term securities & other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.16% [1]
American High-Income Trust - Class F-2 | U.S. corporate bonds & notes [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 74.17%
American High-Income Trust - Class F-2 | Corporate bonds & notes of issuers outside the U.S. [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.57%
American High-Income Trust - Class F-2 | Loans [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
American High-Income Trust - Class F-2 | Other bonds, notes & debt instruments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.08%
American High-Income Trust - Class F-2 | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.95%
American High-Income Trust - Class F-2 | Other Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.47%
American High-Income Trust - Class F-2 | Short-term securities & other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.16% [1]
American High-Income Trust - Class F-3 | U.S. corporate bonds & notes [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 74.17%
American High-Income Trust - Class F-3 | Corporate bonds & notes of issuers outside the U.S. [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.57%
American High-Income Trust - Class F-3 | Loans [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
American High-Income Trust - Class F-3 | Other bonds, notes & debt instruments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.08%
American High-Income Trust - Class F-3 | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.95%
American High-Income Trust - Class F-3 | Other Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.47%
American High-Income Trust - Class F-3 | Short-term securities & other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.16% [1]
American High-Income Trust - Class 529-A | U.S. corporate bonds & notes [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 74.17%
American High-Income Trust - Class 529-A | Corporate bonds & notes of issuers outside the U.S. [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.57%
American High-Income Trust - Class 529-A | Loans [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
American High-Income Trust - Class 529-A | Other bonds, notes & debt instruments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.08%
American High-Income Trust - Class 529-A | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.95%
American High-Income Trust - Class 529-A | Other Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.47%
American High-Income Trust - Class 529-A | Short-term securities & other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.16% [1]
American High-Income Trust - Class 529-C | U.S. corporate bonds & notes [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 74.17%
American High-Income Trust - Class 529-C | Corporate bonds & notes of issuers outside the U.S. [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.57%
American High-Income Trust - Class 529-C | Loans [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
American High-Income Trust - Class 529-C | Other bonds, notes & debt instruments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.08%
American High-Income Trust - Class 529-C | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.95%
American High-Income Trust - Class 529-C | Other Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.47%
American High-Income Trust - Class 529-C | Short-term securities & other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.16% [1]
American High-Income Trust - Class 529-E | U.S. corporate bonds & notes [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 74.17%
American High-Income Trust - Class 529-E | Corporate bonds & notes of issuers outside the U.S. [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.57%
American High-Income Trust - Class 529-E | Loans [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
American High-Income Trust - Class 529-E | Other bonds, notes & debt instruments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.08%
American High-Income Trust - Class 529-E | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.95%
American High-Income Trust - Class 529-E | Other Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.47%
American High-Income Trust - Class 529-E | Short-term securities & other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.16% [1]
American High-Income Trust - Class 529-T | U.S. corporate bonds & notes [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 74.17%
American High-Income Trust - Class 529-T | Corporate bonds & notes of issuers outside the U.S. [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.57%
American High-Income Trust - Class 529-T | Loans [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
American High-Income Trust - Class 529-T | Other bonds, notes & debt instruments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.08%
American High-Income Trust - Class 529-T | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.95%
American High-Income Trust - Class 529-T | Other Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.47%
American High-Income Trust - Class 529-T | Short-term securities & other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.16% [1]
American High-Income Trust - Class 529-F-1 | U.S. corporate bonds & notes [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 74.17%
American High-Income Trust - Class 529-F-1 | Corporate bonds & notes of issuers outside the U.S. [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.57%
American High-Income Trust - Class 529-F-1 | Loans [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
American High-Income Trust - Class 529-F-1 | Other bonds, notes & debt instruments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.08%
American High-Income Trust - Class 529-F-1 | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.95%
American High-Income Trust - Class 529-F-1 | Other Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.47%
American High-Income Trust - Class 529-F-1 | Short-term securities & other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.16% [1]
American High-Income Trust - Class 529-F-2 | U.S. corporate bonds & notes [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 74.17%
American High-Income Trust - Class 529-F-2 | Corporate bonds & notes of issuers outside the U.S. [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.57%
American High-Income Trust - Class 529-F-2 | Loans [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
American High-Income Trust - Class 529-F-2 | Other bonds, notes & debt instruments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.08%
American High-Income Trust - Class 529-F-2 | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.95%
American High-Income Trust - Class 529-F-2 | Other Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.47%
American High-Income Trust - Class 529-F-2 | Short-term securities & other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.16% [1]
American High-Income Trust - Class 529-F-3 | U.S. corporate bonds & notes [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 74.17%
American High-Income Trust - Class 529-F-3 | Corporate bonds & notes of issuers outside the U.S. [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.57%
American High-Income Trust - Class 529-F-3 | Loans [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
American High-Income Trust - Class 529-F-3 | Other bonds, notes & debt instruments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.08%
American High-Income Trust - Class 529-F-3 | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.95%
American High-Income Trust - Class 529-F-3 | Other Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.47%
American High-Income Trust - Class 529-F-3 | Short-term securities & other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.16% [1]
American High-Income Trust - Class R-1 | U.S. corporate bonds & notes [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 74.17%
American High-Income Trust - Class R-1 | Corporate bonds & notes of issuers outside the U.S. [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.57%
American High-Income Trust - Class R-1 | Loans [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
American High-Income Trust - Class R-1 | Other bonds, notes & debt instruments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.08%
American High-Income Trust - Class R-1 | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.95%
American High-Income Trust - Class R-1 | Other Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.47%
American High-Income Trust - Class R-1 | Short-term securities & other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.16% [1]
American High-Income Trust - Class R-2 | U.S. corporate bonds & notes [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 74.17%
American High-Income Trust - Class R-2 | Corporate bonds & notes of issuers outside the U.S. [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.57%
American High-Income Trust - Class R-2 | Loans [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
American High-Income Trust - Class R-2 | Other bonds, notes & debt instruments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.08%
American High-Income Trust - Class R-2 | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.95%
American High-Income Trust - Class R-2 | Other Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.47%
American High-Income Trust - Class R-2 | Short-term securities & other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.16% [1]
American High-Income Trust - Class R-2E | U.S. corporate bonds & notes [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 74.17%
American High-Income Trust - Class R-2E | Corporate bonds & notes of issuers outside the U.S. [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.57%
American High-Income Trust - Class R-2E | Loans [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
American High-Income Trust - Class R-2E | Other bonds, notes & debt instruments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.08%
American High-Income Trust - Class R-2E | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.95%
American High-Income Trust - Class R-2E | Other Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.47%
American High-Income Trust - Class R-2E | Short-term securities & other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.16% [1]
American High-Income Trust - Class R-3 | U.S. corporate bonds & notes [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 74.17%
American High-Income Trust - Class R-3 | Corporate bonds & notes of issuers outside the U.S. [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.57%
American High-Income Trust - Class R-3 | Loans [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
American High-Income Trust - Class R-3 | Other bonds, notes & debt instruments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.08%
American High-Income Trust - Class R-3 | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.95%
American High-Income Trust - Class R-3 | Other Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.47%
American High-Income Trust - Class R-3 | Short-term securities & other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.16% [1]
American High-Income Trust - Class R-4 | U.S. corporate bonds & notes [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 74.17%
American High-Income Trust - Class R-4 | Corporate bonds & notes of issuers outside the U.S. [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.57%
American High-Income Trust - Class R-4 | Loans [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
American High-Income Trust - Class R-4 | Other bonds, notes & debt instruments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.08%
American High-Income Trust - Class R-4 | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.95%
American High-Income Trust - Class R-4 | Other Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.47%
American High-Income Trust - Class R-4 | Short-term securities & other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.16% [1]
American High-Income Trust - Class R-5E | U.S. corporate bonds & notes [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 74.17%
American High-Income Trust - Class R-5E | Corporate bonds & notes of issuers outside the U.S. [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.57%
American High-Income Trust - Class R-5E | Loans [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
American High-Income Trust - Class R-5E | Other bonds, notes & debt instruments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.08%
American High-Income Trust - Class R-5E | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.95%
American High-Income Trust - Class R-5E | Other Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.47%
American High-Income Trust - Class R-5E | Short-term securities & other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.16% [1]
American High-Income Trust - Class R-5 | U.S. corporate bonds & notes [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 74.17%
American High-Income Trust - Class R-5 | Corporate bonds & notes of issuers outside the U.S. [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.57%
American High-Income Trust - Class R-5 | Loans [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
American High-Income Trust - Class R-5 | Other bonds, notes & debt instruments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.08%
American High-Income Trust - Class R-5 | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.95%
American High-Income Trust - Class R-5 | Other Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.47%
American High-Income Trust - Class R-5 | Short-term securities & other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.16% [1]
American High-Income Trust - Class R-6 | U.S. corporate bonds & notes [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 74.17%
American High-Income Trust - Class R-6 | Corporate bonds & notes of issuers outside the U.S. [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 10.57%
American High-Income Trust - Class R-6 | Loans [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
American High-Income Trust - Class R-6 | Other bonds, notes & debt instruments [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.08%
American High-Income Trust - Class R-6 | Common Stock [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 3.95%
American High-Income Trust - Class R-6 | Other Securities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 0.47%
American High-Income Trust - Class R-6 | Short-term securities & other assets less liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.16% [1]
[1] Includes derivatives.