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Derivatives, Hedging Activities and Interest Expense - Derivative Activity Impact on Consolidated Balance Sheet (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Mar. 31, 2019
Other assets [Member]    
Derivatives Fair Value [Line Items]    
Notional $ 37,448 $ 52,025
Fair value 710 544
Counterparty netting (456) (441)
Collateral held (204) (42)
Other assets [Member] | Interest rate swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 37,394 49,254
Fair value 689 472
Other assets [Member] | Foreign currency swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 54 2,771
Fair value 21 72
Other liabilities [Member]    
Derivatives Fair Value [Line Items]    
Notional 76,328 67,389
Fair value 2,009 1,407
Counterparty netting (456) (441)
Collateral posted (1,515) (940)
Other liabilities [Member] | Interest rate swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 63,632 57,593
Fair value 928 622
Other liabilities [Member] | Foreign currency swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 12,696 9,796
Fair value 1,081 785
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 $ 38 $ 26