v3.26.1
Investments in Affiliates - Summary of Transactions in, and Earnings from, Investments in Affiliates (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Investments in and Advances to Affiliates, Activity [Line Items]        
Beginning Value     $ 589,685,144  
Change in Unrealized Appreciation (Depreciation) $ 0 $ (69,689) 0 $ (261,587)
Ending Value 1,064,278,797   1,064,278,797  
Dividend Income 10,339,666 5,286,435 16,126,501 11,074,251
Investment, Affiliated Issuer [Member]        
Investments in and Advances to Affiliates, Activity [Line Items]        
Beginning Value     589,685,144  
Ending Value 1,064,278,797   1,064,278,797  
Affiliated Investments [Member]        
Investments in and Advances to Affiliates, Activity [Line Items]        
Purchases at Cost 458,803,366 294,326,021 1,037,698,435 493,905,180
Proceeds from Sales (521,144,543) (66,145,270) (563,014,078) (365,933,606)
Change in Unrealized Appreciation (Depreciation) 22,676 5,669 (90,704) (68,028)
Affiliated Investments [Member] | Investment, Affiliated Issuer [Member]        
Investments in and Advances to Affiliates, Activity [Line Items]        
Beginning Value 1,126,597,298 421,620,901 589,685,144 521,903,775
Ending Value 1,064,278,797 649,807,321 1,064,278,797 649,807,321
Dividend Income 10,339,666 5,286,435 16,126,501 11,074,251
Affiliated Investments [Member] | Invesco Government & Agency Portfolio, Institutional Class [Member]        
Investments in and Advances to Affiliates, Activity [Line Items]        
Purchases at Cost 458,803,366 294,326,021 1,037,698,435 493,905,180
Proceeds from Sales (521,144,543) (66,145,270) (563,014,078) (365,933,606)
Affiliated Investments [Member] | Invesco Government & Agency Portfolio, Institutional Class [Member] | Investment, Affiliated Issuer [Member]        
Investments in and Advances to Affiliates, Activity [Line Items]        
Beginning Value 1,006,924,708 301,965,318 469,899,174 402,174,495
Ending Value 944,583,531 530,146,069 944,583,531 530,146,069
Dividend Income 9,318,203 4,090,185 14,028,801 8,592,952
Affiliated Investments [Member] | Invesco Short Term Treasury ETF [Member]        
Investments in and Advances to Affiliates, Activity [Line Items]        
Change in Unrealized Appreciation (Depreciation) 22,676 5,669 (90,704) (68,028)
Affiliated Investments [Member] | Invesco Short Term Treasury ETF [Member] | Investment, Affiliated Issuer [Member]        
Investments in and Advances to Affiliates, Activity [Line Items]        
Beginning Value 119,672,590 119,655,583 119,785,970 119,729,280
Ending Value 119,695,266 119,661,252 119,695,266 119,661,252
Dividend Income $ 1,021,463 $ 1,196,250 $ 2,097,700 $ 2,481,299