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Derivatives, Hedging Activities and Interest Expense - Derivative Activity Impact on Consolidated Balance Sheet (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Mar. 31, 2019
Other assets [Member]    
Derivatives Fair Value [Line Items]    
Notional $ 30,850 $ 52,025
Fair value 1,437 544
Counterparty netting (966) (441)
Collateral held (420) (42)
Other assets [Member] | Interest rate swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 30,362 49,254
Fair value 1,410 472
Other assets [Member] | Foreign currency swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 488 2,771
Fair value 27 72
Other liabilities [Member]    
Derivatives Fair Value [Line Items]    
Notional 82,260 67,389
Fair value 3,116 1,407
Counterparty netting (966) (441)
Collateral posted (2,105) (940)
Other liabilities [Member] | Interest rate swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 69,079 57,593
Fair value 1,826 622
Other liabilities [Member] | Foreign currency swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 13,181 9,796
Fair value 1,290 785
Carrying value [Member] | Other assets [Member]    
Derivatives Fair Value [Line Items]    
Carrying value of derivative contracts – Other assets 51 61
Carrying value [Member] | Other liabilities [Member]    
Derivatives Fair Value [Line Items]    
Carrying value of derivative contracts – Other liabilities $ 45 $ 26