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Derivatives, Hedging Activities and Interest Expense - Derivative Activity Impact on Consolidated Balance Sheet (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Mar. 31, 2020
Other assets [Member]    
Derivatives Fair Value [Line Items]    
Notional $ 51,399 $ 30,850
Fair value 1,356 1,437
Counterparty netting (840) (966)
Collateral held (462) (420)
Other assets [Member] | Interest rate swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 44,125 30,362
Fair value 1,026 1,410
Other assets [Member] | Foreign currency swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 7,274 488
Fair value 330 27
Other liabilities [Member]    
Derivatives Fair Value [Line Items]    
Notional 59,383 82,260
Fair value 1,385 3,116
Counterparty netting (840) (966)
Collateral posted (544) (2,105)
Other liabilities [Member] | Interest rate swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 55,062 69,079
Fair value 1,142 1,826
Other liabilities [Member] | Foreign currency swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 4,321 13,181
Fair value 243 1,290
Carrying value [Member] | Other assets [Member]    
Derivatives Fair Value [Line Items]    
Carrying value of derivative contracts – Other assets 54 51
Carrying value [Member] | Other liabilities [Member]    
Derivatives Fair Value [Line Items]    
Carrying value of derivative contracts – Other liabilities $ 1 $ 45