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Derivatives, Hedging Activities and Interest Expense - Derivative Activity Impact on Consolidated Balance Sheet (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Mar. 31, 2021
Other assets [Member]    
Derivatives Fair Value [Line Items]    
Notional $ 54,784 $ 51,399
Fair value 1,019 1,356
Counterparty netting (613) (840)
Collateral held (332) (462)
Other assets [Member] | Interest rate swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 52,147 44,125
Fair value 895 1,026
Other assets [Member] | Foreign currency swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 2,637 7,274
Fair value 124 330
Other liabilities [Member]    
Derivatives Fair Value [Line Items]    
Notional 55,093 59,383
Fair value 1,053 1,385
Counterparty netting (613) (840)
Collateral posted (422) (544)
Other liabilities [Member] | Interest rate swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 47,653 55,062
Fair value 723 1,142
Other liabilities [Member] | Foreign currency swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 7,440 4,321
Fair value 330 243
Carrying value [Member] | Other assets [Member]    
Derivatives Fair Value [Line Items]    
Carrying value of derivative contracts – Other assets 74 54
Carrying value [Member] | Other liabilities [Member]    
Derivatives Fair Value [Line Items]    
Carrying value of derivative contracts – Other liabilities $ 18 $ 1