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Fair Value Measurements - Assets and Liabilities Measured on Recurring Basis Using Significant Unobservable Inputs (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value $ 111 $ 162
Total gains (losses) included in earnings 21 (54)
Total gains (losses) included in other comprehensive income (4) 2
Purchases 7 37
Issuances 0 0
Sales (3) (15)
Settlements (12) (23)
Transfers in to Level 3 0 2
Transfers out of Level 3 (4) 0
Fair value 116 111
The amount of total gains (losses) included in earnings attributable to assets held at the reporting date 21 (54)
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 earnings 0 0
Total gains (losses) included in other comprehensive income (4) 2
Purchases 7 37
Issuances 0 0
Sales (3) (15)
Settlements (8) (12)
Transfers in to Level 3 0 2
Transfers out of Level 3 (4) 0
Fair value $ 91 $ 103
The amount of total gains (losses) included in earnings attributable to assets held at the reporting date
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
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
Total gains (losses) included in earnings 0 0
Total gains (losses) included in other comprehensive income (1) 0
Purchases 0 3
Issuances 0 0
Sales (2) (3)
Settlements 0 0
Transfers in to Level 3 0 2
Transfers out of Level 3 (4) 0
Fair value $ 7 $ 14
The amount of total gains (losses) included in earnings attributable to assets held at the reporting date
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 earnings 0 0
Total gains (losses) included in other comprehensive income (2) 2
Purchases 2 12
Issuances 0 0
Sales 0 (7)
Settlements (3) (7)
Transfers in to Level 3 0 0
Transfers out of Level 3 0 0
Fair value $ 45 $ 48
The amount of total gains (losses) included in earnings attributable to assets held at the reporting date
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
Total gains (losses) included in earnings 0 0
Total gains (losses) included in other comprehensive income (1) 0
Purchases 5 22
Issuances 0 0
Sales (1) (5)
Settlements (5) (5)
Transfers in to Level 3 0 0
Transfers out of Level 3 0 0
Fair value $ 37 $ 39
The amount of total gains (losses) included in earnings attributable to assets held at the reporting date
Derivative [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value $ 8 $ 73
Total gains (losses) included in earnings 21 (54)
Total gains (losses) included in other comprehensive income 0 0
Purchases 0 0
Issuances 0 0
Sales 0 0
Settlements (4) (11)
Transfers in to Level 3 0 0
Transfers out of Level 3 0 0
Fair value 25 8
The amount of total gains (losses) included in earnings attributable to assets held at the reporting date 21 (54)
Derivative [Member] | 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 34 0
Total gains (losses) included in other comprehensive income 0 0
Purchases 0 0
Issuances 0 0
Sales 0 0
Settlements 4 (2)
Transfers in to Level 3 0 0
Transfers out of Level 3 0 0
Fair value 39 1
The amount of total gains (losses) included in earnings attributable to assets held at the reporting date 34 0
Derivative [Member] | 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 (13) (54)
Total gains (losses) included in other comprehensive income 0 0
Purchases 0 0
Issuances 0 0
Sales 0 0
Settlements (8) (9)
Transfers in to Level 3 0 0
Transfers out of Level 3 0 0
Fair value (14) 7
The amount of total gains (losses) included in earnings attributable to assets held at the reporting date $ (13) $ (54)