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Derivatives, Hedging Activities and Interest Expense - Derivative Activity Impact on Consolidated Balance Sheet (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Mar. 31, 2022
Derivatives Fair Value [Line Items]    
Derivative Asset Statement Of Financial Position Other assets Other assets
Derivative liability Statement Of Financial Position Other liabilities Other liabilities
Other assets [Member]    
Derivatives Fair Value [Line Items]    
Notional $ 58,036 $ 65,921
Fair value 1,937 1,480
Counterparty netting (659) (761)
Collateral held (1,227) (658)
Other assets [Member] | Interest rate swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 56,799 64,327
Fair value 1,888 1,425
Other assets [Member] | Foreign currency swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 1,237 1,594
Fair value 49 55
Other liabilities [Member]    
Derivatives Fair Value [Line Items]    
Notional 52,529 28,005
Fair value 1,470 1,539
Counterparty netting (659) (761)
Collateral posted (794) (753)
Other liabilities [Member] | Interest rate swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 46,082 19,903
Fair value 468 822
Other liabilities [Member] | Foreign currency swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 6,447 8,102
Fair value 1,002 717
Carrying value [Member]    
Derivatives Fair Value [Line Items]    
Carrying value of derivative contracts – Other assets 51 61
Carrying value of derivative contracts – Other liabilities $ 17 $ 25