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Goodwill and Other Intangible Assets (Intangible Assets Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]      
Finite-lived intangible assets, gross $ 1,000,000 $ 1,000,000  
Net, intangible asset not subject to amortization 63,000,000 67,000,000  
Gross carrying amount of capitalized software 1,100,000,000 1,200,000,000  
Capitalized computer software, net 321,000,000 355,000,000  
Capitalized computer software, development stage costs $ 42,000,000    
Finite-Lived Intangible Assets, Except Capitalized Internal-Use Software [Member]      
Finite-Lived Intangible Assets [Line Items]      
Weighted-average amortization period 1 year    
Acquired finite-lived intangible asset, residual value $ 0    
Amortization expense 1,000,000 3,000,000 $ 4,000,000
Capitalized Internal Use Software [Member]      
Finite-Lived Intangible Assets [Line Items]      
Acquired finite-lived intangible asset, residual value 0    
Amortization expense 121,000,000 140,000,000 $ 178,000,000
Amortization expense for 2020 114,000,000    
Amortization expense for 2021 93,000,000    
Amortization expense for 2022 55,000,000    
Amortization expense for 2023 26,000,000    
Amortization expense for 2024 22,000,000    
Amortization expense thereafter $ 11,000,000    
Capitalized Internal Use Software, Except Significant System Conversions [Member]      
Finite-Lived Intangible Assets [Line Items]      
Weighted-average amortization period 3 years    
Minimum [Member] | Capitalized Internal Use Software, Significant System Conversions [Member]      
Finite-Lived Intangible Assets [Line Items]      
Weighted-average amortization period 8 years    
Maximum [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived intangible assets, net $ 1,000,000 $ 1,000,000  
Maximum [Member] | Finite-Lived Intangible Assets, Except Capitalized Internal-Use Software [Member]      
Finite-Lived Intangible Assets [Line Items]      
Amortization expense for 2020 $ 1,000,000    
Maximum [Member] | Capitalized Internal Use Software, Significant System Conversions [Member]      
Finite-Lived Intangible Assets [Line Items]      
Weighted-average amortization period 10 years