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Derivatives, Hedging Activities and Interest Expense - Derivative Activity Impact on Consolidated Balance Sheet (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Mar. 31, 2022
Other assets [Member]    
Derivatives Fair Value [Line Items]    
Notional $ 64,331 $ 65,921
Fair value 1,665 1,480
Counterparty netting (890) (761)
Collateral held (723) (658)
Other assets [Member] | Interest rate swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 64,202 64,327
Fair value 1,647 1,425
Other assets [Member] | Foreign currency swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 129 1,594
Fair value 18 55
Other liabilities [Member]    
Derivatives Fair Value [Line Items]    
Notional 37,305 28,005
Fair value 2,388 1,539
Counterparty netting (890) (761)
Collateral posted (1,498) (753)
Other liabilities [Member] | Interest rate swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 27,862 19,903
Fair value 1,018 822
Other liabilities [Member] | Foreign currency swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 9,443 8,102
Fair value 1,370 717
Carrying value [Member] | Other assets [Member]    
Derivatives Fair Value [Line Items]    
Carrying value of derivative contracts – Other assets 52 61
Carrying value [Member] | Other liabilities [Member]    
Derivatives Fair Value [Line Items]    
Carrying value of derivative contracts – Other liabilities $ 0 $ 25