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Goodwill and Other Intangible Assets (Intangible Assets Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross $ 1,000,000 $ 18,000,000  
Indefinite-Lived Intangible Assets (Excluding Goodwill) 67,000,000 79,000,000  
Capitalized Computer Software, Gross 1,200,000,000 1,200,000,000  
Capitalized Computer Software, Net 355,000,000 416,000,000  
Capitalized Computer Software, Development Stage Costs $ 40,000,000    
Finite-Lived Intangible Assets, Except Capitalized Internal-Use Software [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Weighted-Average Useful Life 2 years    
Acquired Finite-lived Intangible Asset, Residual Value $ 0    
Amortization expense 3,000,000 4,000,000 $ 14,000,000
Capitalized Internal Use Software [Member]      
Finite-Lived Intangible Assets [Line Items]      
Acquired Finite-lived Intangible Asset, Residual Value 0    
Amortization expense 140,000,000 178,000,000 $ 201,000,000
Amortization expense for 2019 138,000,000    
Amortization expense for 2020 84,000,000    
Amortization expense for 2021 57,000,000    
Amortization expense for 2022 34,000,000    
Amortization expense for 2023 26,000,000    
Amortization expense thereafter $ 16,000,000    
Capitalized Internal Use Software, Except Significant System Conversions [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Weighted-Average Useful Life 3 years    
Minimum [Member] | Capitalized Internal Use Software, Significant System Conversions [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Weighted-Average Useful Life 8 years    
Maximum [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Net $ 1,000,000 $ 10,000,000  
Amortization expense for 2020 1,000,000    
Amortization expense for 2021 1,000,000    
Maximum [Member] | Finite-Lived Intangible Assets, Except Capitalized Internal-Use Software [Member]      
Finite-Lived Intangible Assets [Line Items]      
Amortization expense for 2019 $ 1,000,000    
Maximum [Member] | Capitalized Internal Use Software, Significant System Conversions [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Weighted-Average Useful Life 10 years