Additional Information (Schedule of Additional Information) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Additional Information [Abstract]
Research and development expense	$ 465	$ 383	$ 453
Advertising expense	730	896	830
Foreign currency net transaction (gains)/losses	(95)	21	49
Interest expense	796	855	1,096
Interest income	(226)	(190)	(182)
Interest expense, net	570	665	914
Total lease cost	$ 332
Total lease cost		$ 312	$ 313