Goodwill and Other Intangible Assets, net (Schedule of Goodwill and Net Carrying Amount of Intangible Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill
Balance at beginning of period	$ 5,196	$ 5,307
Acquisitions	55	0
Asset impairment	(74)	(111)
Balance of end of period	5,177	5,196	$ 5,307
Other Intangible Assets, net
Balance beginning of period	12,279	12,400
Acquisitions	451	15
Asset impairment	0	(98)
Amortization	(43)
Amortization	(44)	(38)	(21)
Balance end of period	$ 12,687	$ 12,279	$ 12,400