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, 2020	Dec. 31, 2019
Goodwill
Balance at beginning of period	$ 5,177	$ 5,196
Acquisitions	0	55
Asset impairment	0	(74)
Balance of end of period	5,177	5,177
Other Intangible Assets, net
Balance beginning of period	12,687	12,279
Acquisitions	0	451
Asset impairment	0	0
Amortization	(72)	(43)
Balance end of period	$ 12,615	$ 12,687