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Derivatives, Hedging Activities and Interest Expense - Derivative Activity Impact on Consolidated Balance Sheet (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Mar. 31, 2021
Other assets [Member]    
Derivatives Fair Value [Line Items]    
Notional $ 66,564 $ 51,399
Fair value 1,083 1,356
Counterparty netting (640) (840)
Collateral held (380) (462)
Other assets [Member] | Interest rate swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 63,788 44,125
Fair value 998 1,026
Other assets [Member] | Foreign currency swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 2,776 7,274
Fair value 85 330
Other liabilities [Member]    
Derivatives Fair Value [Line Items]    
Notional 40,134 59,383
Fair value 938 1,385
Counterparty netting (640) (840)
Collateral posted (298) (544)
Other liabilities [Member] | Interest rate swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 33,127 55,062
Fair value 514 1,142
Other liabilities [Member] | Foreign currency swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 7,007 4,321
Fair value 424 243
Carrying value [Member] | Other assets [Member]    
Derivatives Fair Value [Line Items]    
Carrying value of derivative contracts – Other assets 63 54
Carrying value [Member] | Other liabilities [Member]    
Derivatives Fair Value [Line Items]    
Carrying value of derivative contracts – Other liabilities $ 0 $ 1