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Fair Value (Fair Value Measurements - Reconciliation of Level 3 Assets And Liabilities) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value, measurement, recurring, asset value, beginning balance $ 19 $ 38
Fair value, measurement, recurring, asset, gain (loss) included in earnings 7 (3)
Fair value, measurement, recurring, asset, gain (loss) included in other comprehensive income (loss) 0 0
Fair value, measurement, recurring, asset, purchases 90 59
Fair value, measurement, recurring, asset, sales (84) (66)
Fair value, measurement , recurring, asset, issuances 0 0
Fair value, measurement, recurring, asset, settlements 0 (3)
Fair value, measurement, recurring, asset value, ending balance 32 25
Fair value, assets, recurring, net unrealized gains (losses) 6 (5)
Fair value, assets measured on recurring basis, change in unrealized gain (loss) included in other comprehensive income 0  
Equity securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value, measurement, recurring, asset value, beginning balance 7 19
Fair value, measurement, recurring, asset, gain (loss) included in earnings 4 (4)
Fair value, measurement, recurring, asset, gain (loss) included in other comprehensive income (loss) 0 0
Fair value, measurement, recurring, asset, purchases 0 0
Fair value, measurement, recurring, asset, sales 0 0
Fair value, measurement , recurring, asset, issuances 0 0
Fair value, measurement, recurring, asset, settlements 0 (3)
Fair value, measurement, recurring, asset value, ending balance 11 12
Fair value, assets, recurring, net unrealized gains (losses) 4 (5)
Fair value, assets measured on recurring basis, change in unrealized gain (loss) included in other comprehensive income 0  
Loans held-for-sale    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value, measurement, recurring, asset value, beginning balance 8 13
Fair value, measurement, recurring, asset, gain (loss) included in earnings 1 1
Fair value, measurement, recurring, asset, gain (loss) included in other comprehensive income (loss) 0 0
Fair value, measurement, recurring, asset, purchases 90 59
Fair value, measurement, recurring, asset, sales (84) (66)
Fair value, measurement , recurring, asset, issuances 0 0
Fair value, measurement, recurring, asset, settlements 0 0
Fair value, measurement, recurring, asset value, ending balance 15 7
Fair value, assets, recurring, net unrealized gains (losses) 0 0
Fair value, assets measured on recurring basis, change in unrealized gain (loss) included in other comprehensive income 0  
Retained interest    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value, measurement, recurring, asset value, beginning balance 4 5
Fair value, measurement, recurring, asset, gain (loss) included in earnings 0 0
Fair value, measurement, recurring, asset, gain (loss) included in other comprehensive income (loss) 0 0
Fair value, measurement, recurring, asset, purchases 0 0
Fair value, measurement, recurring, asset, sales 0 0
Fair value, measurement , recurring, asset, issuances 0 0
Fair value, measurement, recurring, asset, settlements 0 0
Fair value, measurement, recurring, asset value, ending balance 4 5
Fair value, assets, recurring, net unrealized gains (losses) 0 0
Fair value, assets measured on recurring basis, change in unrealized gain (loss) included in other comprehensive income 0  
Derivative    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value, measurement, recurring, asset value, beginning balance 0 1
Fair value, measurement, recurring, asset, gain (loss) included in earnings 2 0
Fair value, measurement, recurring, asset, gain (loss) included in other comprehensive income (loss) 0 0
Fair value, measurement, recurring, asset, purchases 0 0
Fair value, measurement, recurring, asset, sales 0 0
Fair value, measurement , recurring, asset, issuances 0 0
Fair value, measurement, recurring, asset, settlements 0 0
Fair value, measurement, recurring, asset value, ending balance 2 1
Fair value, assets, recurring, net unrealized gains (losses) 2 $ 0
Fair value, assets measured on recurring basis, change in unrealized gain (loss) included in other comprehensive income $ 0