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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 9 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]        
Fair value $ 100 $ 149 $ 111 $ 162
Total (losses) included in earnings (12) (17) (6) (29)
Total (losses) included in other comprehensive income (1) 0 (2) 1
Purchases 5 1 5 22
Issuances 0 0 0 0
Sales 0 (5) (3) (15)
Settlements (6) (6) (15) (19)
Transfers in to Level 3 0 2 0 2
Transfers out of Level 3 0 0 (4) 0
Fair value 86 124 86 124
The amount of total (losses) included in earnings attributable to assets held at the reporting date (12) (17) (6) (29)
Available-for-sale securities [Member]        
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]        
Fair value 91 94 103 89
Total (losses) included in earnings 0 0 0 0
Total (losses) included in other comprehensive income (1) 0 (2) 1
Purchases 5 1 5 22
Issuances 0 0 0 0
Sales 0 (5) (3) (15)
Settlements (4) (2) (8) (9)
Transfers in to Level 3 0 2 0 2
Transfers out of Level 3 0 0 (4) 0
Fair value 91 90 91 90
The amount of total (losses) included in earnings attributable to assets held at the reporting date 0 0 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 2 2
Total (losses) included in earnings 0 0 0 0
Total (losses) included in other comprehensive income 0 0 0 0
Purchases 0 0 0 0
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements 0 0 0 0
Transfers in to Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Fair value 2 2 2 2
The amount of total (losses) included in earnings attributable to assets held at the reporting date 0 0 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 12 14 12
Total (losses) included in earnings 0 0 0 0
Total (losses) included in other comprehensive income 0 0 0 0
Purchases 0 0 0 3
Issuances 0 0 0 0
Sales 0 0 (2) (3)
Settlements 0 0 0 0
Transfers in to Level 3 0 2 0 2
Transfers out of Level 3 0 0 (4) 0
Fair value 8 14 8 14
The amount of total (losses) included in earnings attributable to assets held at the reporting date 0 0 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 50 48 48
Total (losses) included in earnings 0 0 0 0
Total (losses) included in other comprehensive income 0 0 (1) 1
Purchases 1 0 1 12
Issuances 0 0 0 0
Sales 0 0 0 (7)
Settlements (1) (1) (3) (5)
Transfers in to Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Fair value 45 49 45 49
The amount of total (losses) included in earnings attributable to assets held at the reporting date 0 0 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 36 30 39 27
Total (losses) included in earnings 0 0 0 0
Total (losses) included in other comprehensive income (1) 0 (1) 0
Purchases 4 1 4 7
Issuances 0 0 0 0
Sales 0 (5) (1) (5)
Settlements (3) (1) (5) (4)
Transfers in to Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Fair value 36 25 36 25
The amount of total (losses) included in earnings attributable to assets held at the reporting date 0 0 0 0
Derivative        
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]        
Fair value 9 55 8 73
Total (losses) included in earnings (12) (17) (6) (29)
Total (losses) included in other comprehensive income 0 0 0 0
Purchases 0 0 0 0
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements (2) (4) (7) (10)
Transfers in to Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Fair value (5) 34 (5) 34
The amount of total (losses) included in earnings attributable to assets held at the reporting date (12) (17) (6) (29)
Derivative | Interest rate swap [Member]        
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]        
Fair value (1) 2 1 3
Total (losses) included in earnings (3) (1) (4) (1)
Total (losses) included in other comprehensive income 0 0 0 0
Purchases 0 0 0 0
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements 2 0 1 (1)
Transfers in to Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Fair value (2) 1 (2) 1
The amount of total (losses) included in earnings attributable to assets held at the reporting date (3) (1) (4) (1)
Derivative | Foreign currency swaps [Member]        
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]        
Fair value 10 53 7 70
Total (losses) included in earnings (9) (16) (2) (28)
Total (losses) included in other comprehensive income 0 0 0 0
Purchases 0 0 0 0
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements (4) (4) (8) (9)
Transfers in to Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Fair value (3) 33 (3) 33
The amount of total (losses) included in earnings attributable to assets held at the reporting date $ (9) $ (16) $ (2) $ (28)