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Intangible Assets Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets acquired $ 33  
Customer-Related Intangible Assets [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets acquired $ 5 $ 99
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 5 years 7 years
Selling and Marketing Expense [Member] | Retail Partner Contracts    
Finite-Lived Intangible Assets [Line Items]    
Amortization expense $ 32 $ 33
Other Expense | Finite-Lived Intangible Assets, Excluding Retail Partner Contracts    
Finite-Lived Intangible Assets [Line Items]    
Amortization expense $ 50 $ 37