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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, 2016
Jun. 30, 2015
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value $ 116 $ 111
Total gains (losses) included in earnings (4) 27
Total gains (losses) included in other comprehensive income 1 (1)
Purchases 2 0
Issuances 0 0
Sales 0 (3)
Settlements (6) (6)
Transfers in to Level 3 0 0
Transfers out of Level 3 0 (4)
Fair value 109 124
The amount of total gains (losses) included in earnings attributable to assets held at the reporting date (4) 27
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 1 (1)
Purchases 2 0
Issuances 0 0
Sales 0 (3)
Settlements (5) (2)
Transfers in to Level 3 0 0
Transfers out of Level 3 0 (4)
Fair value 89 93
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 0 0
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 7 8
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 1 (1)
Purchases 0 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 45 46
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 0 0
Purchases 2 0
Issuances 0 0
Sales 0 (1)
Settlements (4) (1)
Transfers in to Level 3 0 0
Transfers out of Level 3 0 0
Fair value 35 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 (4) 27
Total gains (losses) included in other comprehensive income 0 0
Purchases 0 0
Issuances 0 0
Sales 0 0
Settlements (1) (4)
Transfers in to Level 3 0 0
Transfers out of Level 3 0 0
Fair value 20 31
The amount of total gains (losses) included in earnings attributable to assets held at the reporting date (4) 27
Derivative [Member] | Interest rate swap [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 20 0
Total gains (losses) included in other comprehensive income 0 0
Purchases 0 0
Issuances 0 0
Sales 0 0
Settlements 3 0
Transfers in to Level 3 0 0
Transfers out of Level 3 0 0
Fair value 62 1
The amount of total gains (losses) included in earnings attributable to assets held at the reporting date 20 0
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 (24) 27
Total gains (losses) included in other comprehensive income 0 0
Purchases 0 0
Issuances 0 0
Sales 0 0
Settlements (4) (4)
Transfers in to Level 3 0 0
Transfers out of Level 3 0 0
Fair value (42) 30
The amount of total gains (losses) included in earnings attributable to assets held at the reporting date $ (24) $ 27