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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, 2015
Jun. 30, 2014
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value $ 111 $ 162
Total gains (losses) included in earnings 27 14
Total gains (losses) included in other comprehensive income (1) 1
Purchases 0 4
Issuances 0 0
Sales (3) (2)
Settlements (6) (10)
Transfers in to Level 3 0 0
Transfers out of Level 3 (4) 0
Fair value 124 169
The amount of total (losses) gains included in earnings attributable to assets still held at the reporting date 27 14
Available-for-sale securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value 103 89
Total gains (losses) included in other comprehensive income (1) 1
Purchases 0 4
Issuances 0 0
Sales (3) (2)
Settlements (2) (4)
Transfers in to Level 3 0 0
Transfers out of Level 3 (4) 0
Fair value 93 88
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
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
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 14 12
Purchases 0 0
Issuances 0 0
Sales (2) 0
Settlements 0 0
Transfers in to Level 3 0 0
Transfers out of Level 3 (4) 0
Fair value 8 12
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 48 48
Total gains (losses) included in other comprehensive income (1) 1
Purchases 0 1
Issuances 0 0
Sales 0 (2)
Settlements (1) (3)
Transfers in to Level 3 0 0
Transfers out of Level 3 0 0
Fair value 46 45
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 39 27
Purchases 0 3
Issuances 0 0
Sales (1) 0
Settlements (1) (1)
Transfers in to Level 3 0 0
Transfers out of Level 3 0 0
Fair value 37 29
Derivative    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value 8 73
Total gains (losses) included in earnings 27 14
Purchases 0 0
Issuances 0 0
Sales 0 0
Settlements (4) (6)
Transfers in to Level 3 0 0
Transfers out of Level 3 0 0
Fair value 31 81
The amount of total (losses) gains included in earnings attributable to assets still held at the reporting date 27 14
Derivative | Interest rate swap [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value 1 3
Total gains (losses) included in earnings   1
Purchases 0 0
Issuances 0 0
Sales 0 0
Settlements 0 (1)
Transfers in to Level 3 0 0
Transfers out of Level 3 0 0
Fair value 1 3
The amount of total (losses) gains included in earnings attributable to assets still held at the reporting date   1
Derivative | Foreign currency swaps [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value 7 70
Total gains (losses) included in earnings 27 13
Purchases 0 0
Issuances 0 0
Sales 0 0
Settlements (4) (5)
Transfers in to Level 3 0 0
Transfers out of Level 3 0 0
Fair value 30 78
The amount of total (losses) gains included in earnings attributable to assets still held at the reporting date $ 27 $ 13