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Intangible Assets Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Finite-Lived Intangible Assets [Line Items]        
Finite-lived intangible assets acquired     $ 214  
Customer-Related Intangible Assets [Member]        
Finite-Lived Intangible Assets [Line Items]        
Finite-lived intangible assets acquired     $ 64 $ 22
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 $ 31 $ 32 $ 95 $ 97
Other Expense | Finite-Lived Intangible Assets, Excluding Retail Partner Contracts        
Finite-Lived Intangible Assets [Line Items]        
Amortization expense $ 49 $ 51 $ 150 $ 150