Goodwill and Intangible Assets, Net - Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Goodwill [Roll Forward]
Beginning balance, goodwill	$ 4,071	$ 3,900	$ 3,858
Foreign currency translation	(23)	60	28
Acquisitions			14
Goodwill impairment	(781)	0	0
Ending balance, goodwill	3,287	4,071	3,900
Goodwill, impairment loss, net of tax	750
Goodwill impairment	781	0	$ 0
U.K. Acquisitions
Goodwill [Roll Forward]
Acquisitions		98
U.S. Acquisitions
Goodwill [Roll Forward]
Acquisitions	9
Canada Acquisition
Goodwill [Roll Forward]
Acquisitions	16	10
Goodwill impairment
Goodwill [Roll Forward]
Goodwill impairment	(781)
Goodwill impairment	781
Other
Goodwill [Roll Forward]
Other	$ (5)	$ 3

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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