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Derivatives, Hedging Activities and Interest Expense - Derivative Activity Impact on Consolidated Balance Sheet (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Mar. 31, 2019
Other assets [Member]    
Derivatives Fair Value [Line Items]    
Notional $ 48,296 $ 52,025
Fair value 738 544
Counterparty netting (534) (441)
Collateral held (154) (42)
Other assets [Member] | Interest rate swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 45,525 49,254
Fair value 644 472
Other assets [Member] | Foreign currency swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 2,771 2,771
Fair value 94 72
Other liabilities [Member]    
Derivatives Fair Value [Line Items]    
Notional 68,407 67,389
Fair value 1,518 1,407
Counterparty netting (534) (441)
Collateral posted (982) (940)
Other liabilities [Member] | Interest rate swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 58,611 57,593
Fair value 850 622
Other liabilities [Member] | Foreign currency swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 9,796 9,796
Fair value 668 785
Carrying value [Member] | Other assets [Member]    
Derivatives Fair Value [Line Items]    
Carrying value of derivative contracts – Other assets 50 61
Carrying value [Member] | Other liabilities [Member]    
Derivatives Fair Value [Line Items]    
Carrying value of derivative contracts – Other liabilities $ 2 $ 26