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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, 2019
Jun. 30, 2018
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value $ 94 $ 49
Total gains (losses) included in net income 18 (8)
Total gains (losses) included in other comprehensive income 2 0
Purchases 15 2
Issuances 0 0
Sales 0 0
Settlements 3 (3)
Transfers in to Level 3 0 0
Transfers out of Level 3 (25) 0
Fair value 107 40
The amount of total gains (losses) included in net income attributable to assets held at the reporting date 18 (8)
Available-for-sale debt securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value 93 70
Total gains (losses) included in net income 0 0
Total gains (losses) included in other comprehensive income 2 0
Purchases 15 2
Issuances 0 0
Sales 0 0
Settlements (3) (9)
Transfers in to Level 3 0 0
Transfers out of Level 3 0 0
Fair value 107 63
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] | Mortgage-backed securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Fair value 40 31
Total gains (losses) included in net income 0 0
Total gains (losses) included in other comprehensive income 1 0
Purchases 0 0
Issuances 0 0
Sales 0 0
Settlements 0 (6)
Transfers in to Level 3 0 0
Transfers out of Level 3 0 0
Fair value 41 25
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 53 39
Total gains (losses) included in net income 0 0
Total gains (losses) included in other comprehensive income 1 0
Purchases 15 2
Issuances 0 0
Sales 0 0
Settlements (3) (3)
Transfers in to Level 3 0 0
Transfers out of Level 3 0 0
Fair value 66 38
The amount of total gains (losses) included in net income attributable to assets held at the reporting date 0 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 18 (8)
Fair value 1 (21)
Total gains (losses) included in net income 18 (8)
Total gains (losses) included in other comprehensive income 0 0
Purchases 0 0
Issuances 0 0
Sales 0 0
Settlements 6 6
Transfers in to Level 3 0 0
Transfers out of Level 3 (25) 0
Fair value $ 0 $ (23)