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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, 2018
Jun. 30, 2017
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value $ 49 $ 13
Total gains (losses) included in net income (8) 20
Total gains (losses) included in other comprehensive income 0 0
Purchases 2 16
Issuances 0 0
Sales 0 0
Settlements (3) 51
Transfers in to Level 3 0 0
Transfers out of Level 3 0 (2)
Fair value 40 98
The amount of total gains (losses) included in net income attributable to assets held at the reporting date (8) 13
Derivative [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
The amount of total gains (losses) included in net income attributable to assets held at the reporting date   13
Fair value   (67)
Total gains (losses) included in net income   20
Total gains (losses) included in other comprehensive income   0
Purchases   0
Issuances   0
Sales   0
Settlements   59
Transfers in to Level 3   0
Transfers out of Level 3   0
Fair value   12
Available-for-sale debt securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value 70 80
Total gains (losses) included in net income 0 0
Total gains (losses) included in other comprehensive income 0 0
Purchases 2 16
Issuances 0 0
Sales 0 0
Settlements (9) (8)
Transfers in to Level 3 0 0
Transfers out of Level 3 0 (2)
Fair value 63 86
The amount of total gains (losses) included in net income attributable to assets held at the reporting date 0 0
Available-for-sale debt 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
Total gains (losses) included in net income   0
Total gains (losses) included in other comprehensive income   0
Purchases   0
Issuances   0
Sales   0
Settlements   0
Transfers in to Level 3   0
Transfers out of Level 3   (2)
Fair value   0
The amount of total gains (losses) included in net income attributable to assets held at the reporting date   0
Available-for-sale debt securities [Member] | Mortgage-backed securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value 31 39
Total gains (losses) included in net income 0 0
Total gains (losses) included in other comprehensive income 0 0
Purchases 0 5
Issuances 0 0
Sales 0 0
Settlements (6) (1)
Transfers in to Level 3 0 0
Transfers out of Level 3 0 0
Fair value 25 43
The amount of total gains (losses) included in net income attributable to assets held at the reporting date 0 0
Available-for-sale debt securities [Member] | Asset-backed securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value 39 31
Total gains (losses) included in net income 0 0
Total gains (losses) included in other comprehensive income 0 0
Purchases 2 11
Issuances 0 0
Sales 0 0
Settlements (3) (7)
Transfers in to Level 3 0 0
Transfers out of Level 3 0 0
Fair value 38 35
The amount of total gains (losses) included in net income attributable to assets held at the reporting date 0 0
Available-for-sale debt securities [Member] | Corporate debt securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value   8
Total gains (losses) included in net income   0
Total gains (losses) included in other comprehensive income   0
Purchases   0
Issuances   0
Sales   0
Settlements   0
Transfers in to Level 3   0
Transfers out of Level 3   0
Fair value   8
The amount of total gains (losses) included in net income attributable to assets held at the reporting date   0
Interest rate swaps [Member] | Derivative [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
The amount of total gains (losses) included in net income attributable to assets held at the reporting date (8) 13
Fair value (21) (5)
Total gains (losses) included in net income (8) 13
Total gains (losses) included in other comprehensive income 0 0
Purchases 0 0
Issuances 0 0
Sales 0 0
Settlements 6 4
Transfers in to Level 3 0 0
Transfers out of Level 3 0 0
Fair value $ (23) 12
Foreign currency swaps [Member] | Derivative [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
The amount of total gains (losses) included in net income attributable to assets held at the reporting date   0
Fair value   (62)
Total gains (losses) included in net income   7
Total gains (losses) included in other comprehensive income   0
Purchases   0
Issuances   0
Sales   0
Settlements   55
Transfers in to Level 3   0
Transfers out of Level 3   0
Fair value   $ 0