Goodwill and Intangible Assets, net - Schedule of Goodwill and Other Intangible Assets, Net (Details) $ in Millions	9 Months Ended
Sep. 30, 2020 USD ($)
Amortizing Intangible Assets
Finite-lived intangible assets, net, beginning balance	$ 53
Amortization	(35)
Impairments	0
Acquired	488
Assets held for sale (see Note 4)	(5)
Finite-lived intangible assets, net, ending balance	501
Goodwill
Goodwill, gross, beginning balance	910
Goodwill, impairment	(100)
Goodwill, acquired	8,649
Goodwill, assets held for sale	(9)
Goodwill, gross, ending balance	9,450
Other
Indefinite-lived intangible assets (excluding goodwill), beginning balance	1,058
Impairments	(20)
Acquired	3,081
Assets held for sale (see Note 4)	(154)
Indefinite-lived intangible assets (excluding goodwill), ending balance	$ 3,965

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