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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, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]        
Fair value $ 72 $ 69 $ 13 $ 116
Total gains (losses) included in earnings 6 (64) 31 (76)
Total gains (losses) included in other comprehensive income (1) 0 0 2
Purchases 10 0 31 3
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements (7) (9) 7 (49)
Transfers in to Level 3 0 0 0 0
Transfers out of Level 3 0 0 (2) 0
Fair value 80 (4) 80 (4)
The amount of total gains (losses) included in earnings attributable to assets held at the reporting date 6 (64) 24 (76)
Available-for-sale securities [Member]        
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]        
Fair value 84 85 80 91
Total gains (losses) included in earnings 0 0 0 0
Total gains (losses) included in other comprehensive income (1) 0 0 2
Purchases 10 0 31 3
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements (11) (9) (27) (20)
Transfers in to Level 3 0 0 0 0
Transfers out of Level 3 0 0 (2) 0
Fair value 82 76 82 76
The amount of total gains (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
Total gains (losses) included in earnings   0 0 0
Total gains (losses) included in other comprehensive income   0 0 0
Purchases   0 0 0
Issuances   0 0 0
Sales   0 0 0
Settlements   0 0 0
Transfers in to Level 3   0 0 0
Transfers out of Level 3   0 (2) 0
Fair value 0 2 0 2
The amount of total gains (losses) included in earnings attributable to assets held at the reporting date   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 8 8 7
Total gains (losses) included in earnings 0 0 0 0
Total gains (losses) included in other comprehensive income 0 0 0 1
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 8 8 8 8
The amount of total gains (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 40 41 39 45
Total gains (losses) included in earnings 0 0 0 0
Total gains (losses) included in other comprehensive income 0 (1) 0 0
Purchases 0 0 5 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 36 36 36 36
The amount of total gains (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 34 31 37
Total gains (losses) included in earnings 0 0 0 0
Total gains (losses) included in other comprehensive income (1) 1 0 1
Purchases 10 0 26 3
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements (7) (5) (19) (11)
Transfers in to Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Fair value 38 30 38 30
The amount of total gains (losses) included in earnings attributable to assets held at the reporting date 0 0 0 0
Derivative [Member]        
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]        
The amount of total gains (losses) included in earnings attributable to assets held at the reporting date   (64) 24 (76)
Fair value   (16) (67) 25
Total gains (losses) included in earnings   (64) 31 (76)
Total gains (losses) included in other comprehensive income   0 0 0
Purchases   0 0 0
Issuances   0 0 0
Sales   0 0 0
Settlements   0 34 (29)
Transfers in to Level 3   0 0 0
Transfers out of Level 3   0 0 0
Fair value (2) (80) (2) (80)
Derivative [Member] | Interest rate swaps [Member]        
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]        
The amount of total gains (losses) included in earnings attributable to assets held at the reporting date 6 (47) 24 (27)
Fair value (12) 33 (5) 39
Total gains (losses) included in earnings 6 (47) 24 (27)
Total gains (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 3 (21) (23)
Transfers in to Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Fair value (2) (11) (2) (11)
Derivative [Member] | Foreign currency swaps [Member]        
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]        
The amount of total gains (losses) included in earnings attributable to assets held at the reporting date   (17) 0 (49)
Fair value   (49) (62) (14)
Total gains (losses) included in earnings   (17) 7 (49)
Total gains (losses) included in other comprehensive income   0 0 0
Purchases   0 0 0
Issuances   0 0 0
Sales   0 0 0
Settlements   (3) 55 (6)
Transfers in to Level 3   0 0 0
Transfers out of Level 3   0 0 0
Fair value $ 0 $ (69) $ 0 $ (69)