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Fair Value Measurements - Assets and Liabilities Measured on Recurring Basis Using Significant Unobservable Inputs (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value $ 116 $ 111
Total gains (losses) included in earnings (67) 21
Total gains (losses) included in other comprehensive income 2 (4)
Purchases 10 7
Issuances 0 0
Sales 0 (3)
Settlements (48) (12)
Transfers in to Level 3 0 0
Transfers out of Level 3 0 (4)
Fair value 13 116
The amount of total gains (losses) included in earnings attributable to assets held at the reporting date (67) 21
Available-for-sale securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value 91 103
Total gains (losses) included in earnings 0 0
Total gains (losses) included in other comprehensive income 2 (4)
Purchases 10 7
Issuances 0 0
Sales 0 (3)
Settlements (23) (8)
Transfers in to Level 3 0 0
Transfers out of Level 3 0 (4)
Fair value 80 91
The amount of total gains (losses) included in earnings attributable to assets held at the reporting date 0 0
Available-for-sale securities [Member] | U.S. government and agency obligations [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value 2 2
Total gains (losses) included in earnings 0 0
Total gains (losses) included in other comprehensive income 0 0
Purchases 0 0
Issuances 0 0
Sales 0 0
Settlements 0 0
Transfers in to Level 3 0 0
Transfers out of Level 3 0 0
Fair value 2 2
The amount of total gains (losses) included in earnings attributable to assets held at the reporting date 0 0
Available-for-sale securities [Member] | Corporate debt securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value 7 14
Total gains (losses) included in earnings 0 0
Total gains (losses) included in other comprehensive income 1 (1)
Purchases 0 0
Issuances 0 0
Sales 0 (2)
Settlements 0 0
Transfers in to Level 3 0 0
Transfers out of Level 3 0 (4)
Fair value 8 7
The amount of total gains (losses) included in earnings attributable to assets held at the reporting date 0 0
Available-for-sale securities [Member] | Mortgage-backed securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value 45 48
Total gains (losses) included in earnings 0 0
Total gains (losses) included in other comprehensive income 0 (2)
Purchases 4 2
Issuances 0 0
Sales 0 0
Settlements (10) (3)
Transfers in to Level 3 0 0
Transfers out of Level 3 0 0
Fair value 39 45
The amount of total gains (losses) included in earnings attributable to assets held at the reporting date 0 0
Available-for-sale securities [Member] | Asset-backed securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value 37 39
Total gains (losses) included in earnings 0 0
Total gains (losses) included in other comprehensive income 1 (1)
Purchases 6 5
Issuances 0 0
Sales 0 (1)
Settlements (13) (5)
Transfers in to Level 3 0 0
Transfers out of Level 3 0 0
Fair value 31 37
The amount of total gains (losses) included in earnings attributable to assets held at the reporting date 0 0
Derivative [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value 25 8
Total gains (losses) included in earnings (67) 21
Total gains (losses) included in other comprehensive income 0 0
Purchases 0 0
Issuances 0 0
Sales 0 0
Settlements (25) (4)
Transfers in to Level 3 0 0
Transfers out of Level 3 0 0
Fair value (67) 25
The amount of total gains (losses) included in earnings attributable to assets held at the reporting date (67) 21
Derivative [Member] | Interest rate swaps [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value 39 1
Total gains (losses) included in earnings (24) 34
Total gains (losses) included in other comprehensive income 0 0
Purchases 0 0
Issuances 0 0
Sales 0 0
Settlements (20) 4
Transfers in to Level 3 0 0
Transfers out of Level 3 0 0
Fair value (5) 39
The amount of total gains (losses) included in earnings attributable to assets held at the reporting date (24) 34
Derivative [Member] | Foreign currency swaps [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value (14) 7
Total gains (losses) included in earnings (43) (13)
Total gains (losses) included in other comprehensive income 0 0
Purchases 0 0
Issuances 0 0
Sales 0 0
Settlements (5) (8)
Transfers in to Level 3 0 0
Transfers out of Level 3 0 0
Fair value (62) (14)
The amount of total gains (losses) included in earnings attributable to assets held at the reporting date $ (43) $ (13)