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Derivatives, Hedging Activities and Interest Expense - Derivative Activity Impact on Consolidated Balance Sheets (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Mar. 31, 2016
Derivatives Fair Value [Line Items]    
Carrying value of derivative contracts – Other assets $ 51 $ 68
Carrying value of derivative contracts – Other liabilities 46 7
Counterparty netting and collateral held (154) (320)
Other assets [Member]    
Derivatives Fair Value [Line Items]    
Notional 66,117 35,849
Fair value 599 973
Counterparty netting and collateral held (548) (905)
Other assets [Member] | Interest rate swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 62,525 29,469
Fair value 475 640
Other assets [Member] | Interest rate floors [Member]    
Derivatives Fair Value [Line Items]    
Notional 1,673 1,679
Fair value 2 4
Other assets [Member] | Foreign currency swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 1,919 4,701
Fair value 122 329
Other liabilities [Member]    
Derivatives Fair Value [Line Items]    
Notional 57,990 77,753
Fair value 1,453 1,310
Counterparty netting and collateral posted (1,407) (1,303)
Other liabilities [Member] | Interest rate swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 45,297 68,383
Fair value 277 475
Other liabilities [Member] | Foreign currency swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 12,663 9,340
Fair value 1,176 835
Other liabilities [Member] | Interest rate caps [Member]    
Derivatives Fair Value [Line Items]    
Notional 30 30
Fair value 0 0
Carrying value [Member] | Other assets [Member]    
Derivatives Fair Value [Line Items]    
Carrying value of derivative contracts – Other assets 51 68
Carrying value [Member] | Other liabilities [Member]    
Derivatives Fair Value [Line Items]    
Carrying value of derivative contracts – Other liabilities 46 7
Hedge accounting derivatives [Member] | Other assets [Member]    
Derivatives Fair Value [Line Items]    
Notional 271 364
Fair value 28 39
Hedge accounting derivatives [Member] | Other assets [Member] | Interest rate swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 0 0
Fair value 0 0
Hedge accounting derivatives [Member] | Other assets [Member] | Interest rate floors [Member]    
Derivatives Fair Value [Line Items]    
Notional 0 0
Fair value 0 0
Hedge accounting derivatives [Member] | Other assets [Member] | Foreign currency swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 271 364
Fair value 28 39
Hedge accounting derivatives [Member] | Other liabilities [Member]    
Derivatives Fair Value [Line Items]    
Notional 93 0
Fair value 1 0
Hedge accounting derivatives [Member] | Other liabilities [Member] | Interest rate swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 0 0
Fair value 0 0
Hedge accounting derivatives [Member] | Other liabilities [Member] | Foreign currency swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 93 0
Fair value 1 0
Hedge accounting derivatives [Member] | Other liabilities [Member] | Interest rate caps [Member]    
Derivatives Fair Value [Line Items]    
Notional 0 0
Fair value 0 0
Non-hedge accounting derivatives [Member] | Other assets [Member]    
Derivatives Fair Value [Line Items]    
Notional 65,846 35,485
Fair value 571 934
Non-hedge accounting derivatives [Member] | Other assets [Member] | Interest rate swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 62,525 29,469
Fair value 475 640
Non-hedge accounting derivatives [Member] | Other assets [Member] | Interest rate floors [Member]    
Derivatives Fair Value [Line Items]    
Notional 1,673 1,679
Fair value 2 4
Non-hedge accounting derivatives [Member] | Other assets [Member] | Foreign currency swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 1,648 4,337
Fair value 94 290
Non-hedge accounting derivatives [Member] | Other liabilities [Member]    
Derivatives Fair Value [Line Items]    
Notional 57,897 77,753
Fair value 1,452 1,310
Non-hedge accounting derivatives [Member] | Other liabilities [Member] | Interest rate swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 45,297 68,383
Fair value 277 475
Non-hedge accounting derivatives [Member] | Other liabilities [Member] | Foreign currency swaps [Member]    
Derivatives Fair Value [Line Items]    
Notional 12,570 9,340
Fair value 1,175 835
Non-hedge accounting derivatives [Member] | Other liabilities [Member] | Interest rate caps [Member]    
Derivatives Fair Value [Line Items]    
Notional 30 30
Fair value $ 0 $ 0