Goodwill and Intangible Assets - Changes in Goodwill and Intangible Assets (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Goodwill
Balance at January 1	$ 21,895,000,000	$ 20,848,000,000
Currency	(464,000,000)	516,000,000
Divestitures	0	0
Acquisitions	547,000,000	531,000,000
Asset impairments	0	0
Balance at December 31	21,978,000,000	21,895,000,000
Intangible Assets, at cost
Balance at January 1	20,399,000,000	19,670,000,000
Currency	(465,000,000)	320,000,000
Divestitures	(17,000,000)	0
Acquisitions	405,000,000	553,000,000
Asset impairments	(32,000,000)	(144,000,000)
Balance at December 31	$ 20,290,000,000	$ 20,399,000,000