Additional Information (Schedule of Additional Information) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Research and development expense	$ 168	$ 252	$ 241
Advertising expense	33	37	29
Interest expense	1,322	697	736
Interest income	(42)	(32)	(31)
Interest and other debt expense, net	$ 1,280	$ 665	$ 705