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Derivatives, Hedging Activities and Interest Expense - Derivative Activity Impact on Consolidated Balance Sheet (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Mar. 31, 2020
Other assets [Member]    
Derivatives Fair Value [Line Items]    
Notional $ 41,805 $ 30,850
Fair value 1,647 1,437
Counterparty netting (850) (966)
Collateral held (731) (420)
Other assets [Member] | Interest rate swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 35,879 30,362
Fair value 1,387 1,410
Other assets [Member] | Foreign currency swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 5,926 488
Fair value 260 27
Other liabilities [Member]    
Derivatives Fair Value [Line Items]    
Notional 62,984 82,260
Fair value 1,911 3,116
Counterparty netting (850) (966)
Collateral posted (1,055) (2,105)
Other liabilities [Member] | Interest rate swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 56,816 69,079
Fair value 1,605 1,826
Other liabilities [Member] | Foreign currency swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 6,168 13,181
Fair value 306 1,290
Carrying value [Member] | Other assets [Member]    
Derivatives Fair Value [Line Items]    
Carrying value of derivative contracts – Other assets 66 51
Carrying value [Member] | Other liabilities [Member]    
Derivatives Fair Value [Line Items]    
Carrying value of derivative contracts – Other liabilities $ 6 $ 45