Goodwill, Customer Relationships and Other Intangible Assets - Goodwill Activity (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 7,405	$ 7,415
Reclassified as held for sale	(713)
Effect of foreign currency exchange rate changes and other	(26)	(10)
Goodwill, ending balance	6,666	7,405
Goodwill, accumulated impairment loss	$ 3,600	$ 3,700	$ 3,700