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Summary of Significant Accounting Policies - Indefinite-lived intangible assets and goodwill (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Indefinite-lived Intangible Assets [Line Items]    
Indefinite-lived intangible assets $ 143 $ 143
Goodwill 916 902
Trademarks/tradenames    
Indefinite-lived Intangible Assets [Line Items]    
Indefinite-lived intangible assets $ 143 $ 143