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Derivatives, Hedging Activities and Interest Expense - Derivative Activity Impact on Consolidated Balance Sheet (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Mar. 31, 2020
Other assets [Member]    
Derivatives Fair Value [Line Items]    
Notional $ 48,979 $ 30,850
Fair value 2,030 1,437
Counterparty netting (794) (966)
Collateral held (1,176) (420)
Other assets [Member] | Interest rate swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 38,555 30,362
Fair value 1,285 1,410
Other assets [Member] | Foreign currency swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 10,424 488
Fair value 745 27
Other liabilities [Member]    
Derivatives Fair Value [Line Items]    
Notional 58,568 82,260
Fair value 1,470 3,116
Counterparty netting (794) (966)
Collateral posted (652) (2,105)
Other liabilities [Member] | Interest rate swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 56,256 69,079
Fair value 1,361 1,826
Other liabilities [Member] | Foreign currency swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 2,312 13,181
Fair value 109 1,290
Carrying value [Member] | Other assets [Member]    
Derivatives Fair Value [Line Items]    
Carrying value of derivative contracts – Other assets 60 51
Carrying value [Member] | Other liabilities [Member]    
Derivatives Fair Value [Line Items]    
Carrying value of derivative contracts – Other liabilities $ 24 $ 45