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Goodwill, Intangible Assets, and Long-Lived Assets - Impairment (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]        
Intangible assets $ 0 $ 0 $ 0 $ 23
Property and equipment $ 0 50 $ 0 140
Operating lease right-of-use assets   26   76
Intangible assets   $ 76   $ 239