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Derivatives, Hedging Activities and Interest Expense - Derivative Activity Impact on Consolidated Balance Sheet (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Mar. 31, 2018
Other assets [Member]    
Derivatives Fair Value [Line Items]    
Notional   $ 79,678
Fair value   1,358
Counterparty netting   (560)
Collateral held   (737)
Other assets [Member] | Interest rate swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional   71,464
Fair value   872
Other assets [Member] | Interest rate floors [Member]    
Derivatives Fair Value [Line Items]    
Notional   847
Fair value   1
Other assets [Member] | Foreign currency swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional   7,367
Fair value   485
Other liabilities [Member]    
Derivatives Fair Value [Line Items]    
Notional   47,376
Fair value   828
Counterparty netting   (560)
Collateral posted   (262)
Other liabilities [Member] | Interest rate swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional   41,513
Fair value   628
Other liabilities [Member] | Foreign currency swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional   5,863
Fair value   200
Carrying value [Member] | Other assets [Member]    
Derivatives Fair Value [Line Items]    
Carrying value of derivative contracts – Other assets   61
Carrying value [Member] | Other liabilities [Member]    
Derivatives Fair Value [Line Items]    
Carrying value of derivative contracts – Other liabilities   6
Hedge accounting derivatives [Member] | Other assets [Member]    
Derivatives Fair Value [Line Items]    
Notional   119
Fair value   8
Hedge accounting derivatives [Member] | Other assets [Member] | Interest rate swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional $ 0 0
Fair value   0
Hedge accounting derivatives [Member] | Other assets [Member] | Interest rate floors [Member]    
Derivatives Fair Value [Line Items]    
Notional 0 0
Fair value   0
Hedge accounting derivatives [Member] | Other assets [Member] | Foreign currency swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 0 119
Fair value   8
Hedge accounting derivatives [Member] | Other liabilities [Member]    
Derivatives Fair Value [Line Items]    
Notional   0
Fair value   0
Hedge accounting derivatives [Member] | Other liabilities [Member] | Interest rate swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional   0
Fair value   0
Hedge accounting derivatives [Member] | Other liabilities [Member] | Foreign currency swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional   0
Fair value   0
Hedge accounting derivatives [Member] | Carrying value [Member] | Other liabilities [Member]    
Derivatives Fair Value [Line Items]    
Carrying value of derivative contracts – Other liabilities   0
Non-hedge accounting derivatives [Member] | Other assets [Member]    
Derivatives Fair Value [Line Items]    
Notional 52,025 79,559
Fair value 544 1,350
Counterparty netting (441)  
Collateral held (42)  
Non-hedge accounting derivatives [Member] | Other assets [Member] | Interest rate swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 49,254 71,464
Fair value 472 872
Non-hedge accounting derivatives [Member] | Other assets [Member] | Interest rate floors [Member]    
Derivatives Fair Value [Line Items]    
Notional   847
Fair value   1
Non-hedge accounting derivatives [Member] | Other assets [Member] | Foreign currency swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 2,771 7,248
Fair value 72 477
Non-hedge accounting derivatives [Member] | Other liabilities [Member]    
Derivatives Fair Value [Line Items]    
Notional 67,389 47,376
Fair value 1,407 828
Counterparty netting (441)  
Collateral posted (940)  
Non-hedge accounting derivatives [Member] | Other liabilities [Member] | Interest rate swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 57,593 41,513
Fair value 622 628
Non-hedge accounting derivatives [Member] | Other liabilities [Member] | Foreign currency swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 9,796 5,863
Fair value 785 $ 200
Non-hedge accounting derivatives [Member] | Carrying value [Member] | Other assets [Member]    
Derivatives Fair Value [Line Items]    
Carrying value of derivative contracts – Other assets 61  
Non-hedge accounting derivatives [Member] | Carrying value [Member] | Other liabilities [Member]    
Derivatives Fair Value [Line Items]    
Carrying value of derivative contracts – Other liabilities $ 26