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Fair Value (Fair Value Measurements - Reconciliation of Level 3 Assets And Liabilities) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair value, measurement, recurring, asset value, beginning balance $ 32 $ 25 $ 19 $ 38
Fair value, measurement, recurring, asset, gain (loss) included in earnings 5 1 12 (2)
Fair value, measurement, recurring, asset, gain (loss) included in other comprehensive income (loss) 0 0 0 0
Fair value, measurement, recurring, asset, purchases 156 73 246 132
Fair value, measurement, recurring, asset, sales (152) (68) (236) (134)
Fair value, measurement , recurring, asset, issuances 0 0 0 0
Fair value, measurement, recurring, asset, settlements (5) (1) (5) (4)
Fair value, measurement, recurring, asset value, ending balance 36 30 36 30
Fair value, assets, recurring, net unrealized gains (losses) 2 0 8 (5)
Fair value, assets measured on recurring basis, change in unrealized gain (loss) included in other comprehensive income 0   0  
Equity securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair value, measurement, recurring, asset value, beginning balance 11 12 7 19
Fair value, measurement, recurring, asset, gain (loss) included in earnings 2 0 6 (4)
Fair value, measurement, recurring, asset, gain (loss) included in other comprehensive income (loss) 0 0 0 0
Fair value, measurement, recurring, asset, purchases 0 0 0 0
Fair value, measurement, recurring, asset, sales 0 0 0 0
Fair value, measurement , recurring, asset, issuances 0 0 0 0
Fair value, measurement, recurring, asset, settlements (4) 0 (4) (3)
Fair value, measurement, recurring, asset value, ending balance 9 12 9 12
Fair value, assets, recurring, net unrealized gains (losses) 2 0 6 (5)
Fair value, assets measured on recurring basis, change in unrealized gain (loss) included in other comprehensive income 0   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 15 7 8 13
Fair value, measurement, recurring, asset, gain (loss) included in earnings 3 1 4 2
Fair value, measurement, recurring, asset, gain (loss) included in other comprehensive income (loss) 0 0 0 0
Fair value, measurement, recurring, asset, purchases 156 73 246 132
Fair value, measurement, recurring, asset, sales (152) (68) (236) (134)
Fair value, measurement , recurring, asset, issuances 0 0 0 0
Fair value, measurement, recurring, asset, settlements 0 0 0 0
Fair value, measurement, recurring, asset value, ending balance 22 13 22 13
Fair value, assets, recurring, net unrealized gains (losses) 0 0 0 0
Fair value, assets measured on recurring basis, change in unrealized gain (loss) included in other comprehensive income 0   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 4 5
Fair value, measurement, recurring, asset, gain (loss) included in earnings 0 0 0 0
Fair value, measurement, recurring, asset, gain (loss) included in other comprehensive income (loss) 0 0 0 0
Fair value, measurement, recurring, asset, purchases 0 0 0 0
Fair value, measurement, recurring, asset, sales 0 0 0 0
Fair value, measurement , recurring, asset, issuances 0 0 0 0
Fair value, measurement, recurring, asset, settlements (1) (1) (1) (1)
Fair value, measurement, recurring, asset value, ending balance 3 4 3 4
Fair value, assets, recurring, net unrealized gains (losses) 0 0 0 0
Fair value, assets measured on recurring basis, change in unrealized gain (loss) included in other comprehensive income 0   0  
Derivative        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair value, measurement, recurring, asset value, beginning balance 2 1 0 1
Fair value, measurement, recurring, asset, gain (loss) included in earnings 0 0 2 0
Fair value, measurement, recurring, asset, gain (loss) included in other comprehensive income (loss) 0 0 0 0
Fair value, measurement, recurring, asset, purchases 0 0 0 0
Fair value, measurement, recurring, asset, sales 0 0 0 0
Fair value, measurement , recurring, asset, issuances 0 0 0 0
Fair value, measurement, recurring, asset, settlements 0 0 0 0
Fair value, measurement, recurring, asset value, ending balance 2 1 2 1
Fair value, assets, recurring, net unrealized gains (losses) 0 $ 0 2 $ 0
Fair value, assets measured on recurring basis, change in unrealized gain (loss) included in other comprehensive income $ 0   $ 0