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Derivatives, Hedging Activities and Interest Expense - Derivative Activity Impact on Consolidated Balance Sheet (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Mar. 31, 2021
Other assets [Member]    
Derivatives Fair Value [Line Items]    
Notional $ 65,921 $ 51,399
Fair value 1,480 1,356
Counterparty netting (761) (840)
Collateral held (658) (462)
Other assets [Member] | Interest rate swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 64,327 44,125
Fair value 1,425 1,026
Other assets [Member] | Foreign currency swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 1,594 7,274
Fair value 55 330
Other liabilities [Member]    
Derivatives Fair Value [Line Items]    
Notional 28,005 59,383
Fair value 1,539 1,385
Counterparty netting (761) (840)
Collateral posted (753) (544)
Other liabilities [Member] | Interest rate swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 19,903 55,062
Fair value 822 1,142
Other liabilities [Member] | Foreign currency swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 8,102 4,321
Fair value 717 243
Carrying value [Member] | Other assets [Member]    
Derivatives Fair Value [Line Items]    
Carrying value of derivative contracts – Other assets 61 54
Carrying value [Member] | Other liabilities [Member]    
Derivatives Fair Value [Line Items]    
Carrying value of derivative contracts – Other liabilities $ 25 $ 1