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Fair Value (Fair Value Measurements - Reconciliation of Level 3 Assets And Liabilities) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value, measurement, recurring, asset value, beginning balance   $ 29
Fair value, measurement, recurring, asset, gain (loss) included in earnings $ (3) 4
Fair value, measurement, recurring, asset, gain (loss) included in other comprehensive income (loss) 0 0
Fair value, measurement, recurring, asset, purchases 303 137
Fair value, measurement, recurring, asset, sales (313) (118)
Fair value, measurement , recurring, asset, issuances 0 0
Fair value, measurement, recurring, asset, settlements (6) (33)
Fair value, measurement, recurring, asset value, ending balance 19  
Fair value, assets, recurring, net unrealized gains (losses) (10) 1
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 19  
Fair value, measurement, recurring, asset, gain (loss) included in earnings (7)  
Fair value, measurement, recurring, asset, gain (loss) included in other comprehensive income (loss) 0  
Fair value, measurement, recurring, asset, purchases 0  
Fair value, measurement, recurring, asset, sales 0  
Fair value, measurement , recurring, asset, issuances 0  
Fair value, measurement, recurring, asset, settlements (5)  
Fair value, measurement, recurring, asset value, ending balance 7 19
Fair value, assets, recurring, net unrealized gains (losses) (10)  
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 13 0
Fair value, measurement, recurring, asset, gain (loss) included in earnings 5 2
Fair value, measurement, recurring, asset, gain (loss) included in other comprehensive income (loss) 0 0
Fair value, measurement, recurring, asset, purchases 303 137
Fair value, measurement, recurring, asset, sales (313) (126)
Fair value, measurement , recurring, asset, issuances 0 0
Fair value, measurement, recurring, asset, settlements 0 0
Fair value, measurement, recurring, asset value, ending balance 8 13
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 5 29
Fair value, measurement, recurring, asset, gain (loss) included in earnings 0 1
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 8
Fair value, measurement , recurring, asset, issuances 0 0
Fair value, measurement, recurring, asset, settlements (1) (33)
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 1 0
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 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 0 1
Fair value, assets, recurring, net unrealized gains (losses) 0 1
Fair value, assets measured on recurring basis, change in unrealized gain (loss) included in other comprehensive income 0  
Total assets after adoption of ASU 2016-01    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value, measurement, recurring, asset value, beginning balance 38  
Fair value, measurement, recurring, asset value, ending balance   38
Total assets prior to adoption of ASU 2016-01    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value, measurement, recurring, asset value, beginning balance $ 19  
Fair value, measurement, recurring, asset value, ending balance   $ 19