Goodwill and Other Intangible Assets - Schedule of Intangible Assets by Type (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Finite-Lived Intangible Assets, Net [Abstract]
Finite-lived intangible assets, gross	$ 4,918	$ 4,918		$ 5,994
Finite-lived intangible assets, accumulated amortization	(2,734)	(2,734)		(2,855)
Finite-lived intangible assets, net	2,184	2,184		3,139
Indefinite-lived intangible assets	2,193	2,193		2,242
Intangible assets, gross	7,111	7,111		8,236
Other intangible assets, net	4,377	4,377		5,381
Intangible assets impairment		729	$ 0
Customer relationships
Finite-Lived Intangible Assets, Net [Abstract]
Finite-lived intangible assets, gross	2,243	2,243		3,027
Finite-lived intangible assets, accumulated amortization	(888)	(888)		(1,045)
Finite-lived intangible assets, net	1,355	1,355		1,982
Intangible assets impairment	4	480
Technology
Finite-Lived Intangible Assets, Net [Abstract]
Finite-lived intangible assets, gross	1,097	1,097		1,075
Finite-lived intangible assets, accumulated amortization	(663)	(663)		(626)
Finite-lived intangible assets, net	434	434		449
Intangible assets impairment		8
Trade names and trademarks
Finite-Lived Intangible Assets, Net [Abstract]
Finite-lived intangible assets, gross	325	325		696
Finite-lived intangible assets, accumulated amortization	(178)	(178)		(254)
Finite-lived intangible assets, net	147	147		442
Intangible assets impairment		236
Capitalized software
Finite-Lived Intangible Assets, Net [Abstract]
Finite-lived intangible assets, gross	1,253	1,253		1,193
Finite-lived intangible assets, accumulated amortization	(1,005)	(1,005)		(928)
Finite-lived intangible assets, net	248	248		265
Intangible assets impairment		3
Other
Finite-Lived Intangible Assets, Net [Abstract]
Finite-lived intangible assets, gross	0	0		3
Finite-lived intangible assets, accumulated amortization	0	0		(2)
Finite-lived intangible assets, net	$ 0	$ 0		$ 1