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Fair Value Measurements - Assets and Liabilities Measured on Recurring Basis Using Significant Unobservable Inputs (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value $ 13 $ 116
Total gains (losses) included in earnings 20 (4)
Total gains (losses) included in other comprehensive income 0 1
Purchases 16 2
Issuances 0 0
Sales 0 0
Settlements 51 (6)
Transfers in to Level 3 0 0
Transfers out of Level 3 (2) 0
Fair value 98 109
The amount of total gains (losses) included in earnings attributable to assets held at the reporting date 13 (4)
Available-for-sale securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value 80 91
Total gains (losses) included in earnings 0 0
Total gains (losses) included in other comprehensive income 0 1
Purchases 16 2
Issuances 0 0
Sales 0 0
Settlements (8) (5)
Transfers in to Level 3 0 0
Transfers out of Level 3 (2) 0
Fair value 86 89
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 (2) 0
Fair value 0 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 8 7
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 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 39 45
Total gains (losses) included in earnings 0 0
Total gains (losses) included in other comprehensive income 0 1
Purchases 5 0
Issuances 0 0
Sales 0 0
Settlements (1) (1)
Transfers in to Level 3 0 0
Transfers out of Level 3 0 0
Fair value 43 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 31 37
Total gains (losses) included in earnings 0 0
Total gains (losses) included in other comprehensive income 0 0
Purchases 11 2
Issuances 0 0
Sales 0 0
Settlements (7) (4)
Transfers in to Level 3 0 0
Transfers out of Level 3 0 0
Fair value 35 35
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 (67) 25
Total gains (losses) included in earnings 20 (4)
Total gains (losses) included in other comprehensive income 0 0
Purchases 0 0
Issuances 0 0
Sales 0 0
Settlements 59 (1)
Transfers in to Level 3 0 0
Transfers out of Level 3 0 0
Fair value 12 20
The amount of total gains (losses) included in earnings attributable to assets held at the reporting date 13 (4)
Derivative [Member] | Interest rate swaps [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value (5) 39
Total gains (losses) included in earnings 13 20
Total gains (losses) included in other comprehensive income 0 0
Purchases 0 0
Issuances 0 0
Sales 0 0
Settlements 4 3
Transfers in to Level 3 0 0
Transfers out of Level 3 0 0
Fair value 12 62
The amount of total gains (losses) included in earnings attributable to assets held at the reporting date 13 20
Derivative [Member] | Foreign currency swaps [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value (62) (14)
Total gains (losses) included in earnings 7 (24)
Total gains (losses) included in other comprehensive income 0 0
Purchases 0 0
Issuances 0 0
Sales 0 0
Settlements 55 (4)
Transfers in to Level 3 0 0
Transfers out of Level 3 0 0
Fair value 0 (42)
The amount of total gains (losses) included in earnings attributable to assets held at the reporting date $ 0 $ (24)