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Variable Interest Entities - Programs Under Proportional Amortization Election (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Programs for which the Firm elected proportional amortization:    
Carrying value $ 29,821 $ 14,644
Tax credits and other tax benefits 1,266 566
Investments that qualify to be accounted for using proportional amortization:    
Amortization gains/(losses) recognized as a component of income tax expense (1,016) (399)
Non-income-tax-related gains/(losses) and other returns received that are recognized outside of income tax expense $ 48 $ 0