Goodwill and Intangible Assets - Goodwill Rollforward (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Goodwill Roll Forward
Balance at beginning of period	$ 11,635,000,000	$ 7,143,000,000
Foreign currency and other	(72,000,000)	22,000,000
Acquired	5,270,000,000	4,470,000,000
Balance at end of period	16,833,000,000	11,635,000,000	$ 7,143,000,000
Goodwill, Impaired, Accumulated Impairment Loss
Accumulated impairments	700,000,000
Impairment		0	0
IS
Goodwill Roll Forward
Balance at beginning of period	476,000,000	261,000,000
Foreign currency and other	(1,000,000)	15,000,000
Acquired	0	200,000,000
Balance at end of period	475,000,000	476,000,000	261,000,000
Goodwill, Impaired, Accumulated Impairment Loss
Accumulated impairments	673,000,000
WM
Goodwill Roll Forward
Balance at beginning of period	10,278,000,000	6,001,000,000
Foreign currency and other	(68,000,000)	7,000,000
Acquired	115,000,000	4,270,000,000
Balance at end of period	10,325,000,000	10,278,000,000	6,001,000,000
Goodwill, Impaired, Accumulated Impairment Loss
Accumulated impairments	0
IM
Goodwill Roll Forward
Balance at beginning of period	881,000,000	881,000,000
Foreign currency and other	(3,000,000)	0
Acquired	5,155,000,000	0
Balance at end of period	6,033,000,000	$ 881,000,000	$ 881,000,000
Goodwill, Impaired, Accumulated Impairment Loss
Accumulated impairments	$ 27,000,000