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Derivatives, Hedging Activities and Interest Expense - Derivative Activity Impact on Consolidated Balance Sheet (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Mar. 31, 2018
Derivatives Fair Value [Line Items]    
Counterparty netting and collateral held $ (366) $ (737)
Other assets [Member]    
Derivatives Fair Value [Line Items]    
Notional   79,678
Fair value   1,358
Counterparty netting and collateral held   (1,297)
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 and collateral posted   (822)
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
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
Fair value   0
Hedge accounting derivatives [Member] | Other assets [Member] | Interest rate floors [Member]    
Derivatives Fair Value [Line Items]    
Notional   0
Fair value   0
Hedge accounting derivatives [Member] | Other assets [Member] | Foreign currency swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional   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
Non-hedge accounting derivatives [Member] | Other assets [Member]    
Derivatives Fair Value [Line Items]    
Notional 67,556 79,559
Fair value 994 1,350
Counterparty netting and collateral held (945)  
Non-hedge accounting derivatives [Member] | Other assets [Member] | Interest rate swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 65,114 71,464
Fair value 889 872
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 2,442 7,248
Fair value 105 477
Non-hedge accounting derivatives [Member] | Other liabilities [Member]    
Derivatives Fair Value [Line Items]    
Notional 59,982 47,376
Fair value 1,533 828
Counterparty netting and collateral posted (1,502)  
Non-hedge accounting derivatives [Member] | Other liabilities [Member] | Interest rate swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 50,007 41,513
Fair value 837 628
Non-hedge accounting derivatives [Member] | Other liabilities [Member] | Foreign currency swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 9,975 5,863
Fair value 696 200
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
Carrying value [Member] | Non-hedge accounting derivatives [Member] | Other assets [Member]    
Derivatives Fair Value [Line Items]    
Carrying value of derivative contracts – Other assets 49  
Carrying value [Member] | Non-hedge accounting derivatives [Member] | Other liabilities [Member]    
Derivatives Fair Value [Line Items]    
Carrying value of derivative contracts – Other liabilities $ 31