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Derivatives, Hedging Activities and Interest Expense - Derivative Activity Impact on Consolidated Balance Sheet (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Mar. 31, 2021
Other assets [Member]    
Derivatives Fair Value [Line Items]    
Notional $ 56,123 $ 51,399
Fair value 1,389 1,356
Counterparty netting (726) (840)
Collateral held (609) (462)
Other assets [Member] | Interest rate swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 48,706 44,125
Fair value 1,041 1,026
Other assets [Member] | Foreign currency swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 7,417 7,274
Fair value 348 330
Other liabilities [Member]    
Derivatives Fair Value [Line Items]    
Notional 55,939 59,383
Fair value 1,162 1,385
Counterparty netting (726) (840)
Collateral posted (420) (544)
Other liabilities [Member] | Interest rate swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 50,656 55,062
Fair value 880 1,142
Other liabilities [Member] | Foreign currency swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 5,283 4,321
Fair value 282 243
Carrying value [Member] | Other assets [Member]    
Derivatives Fair Value [Line Items]    
Carrying value of derivative contracts – Other assets 54 54
Carrying value [Member] | Other liabilities [Member]    
Derivatives Fair Value [Line Items]    
Carrying value of derivative contracts – Other liabilities $ 16 $ 1