Supplementary Data - Quarterly Financial Data - Unaudited (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Data [Abstract]
Net revenues	$ 2,821	$ 2,649	$ 2,687	$ 2,643	$ 2,877	$ 2,649	$ 2,640	$ 2,580	$ 10,800	$ 10,746	$ 9,927
Gross profit	2,171	2,022	2,057	2,042	2,259	2,041	2,043	2,021	8,292	8,364	7,706
Income (loss) from continuing operations	558	310	403	521	763	720	638	407	1,792	2,528	(1,013)
Income (loss) from discontinued operations, net of income taxes	(2)	0	(1)	(3)	(3)	1	4	0	(6)	2	(4)
Net income (loss)	$ 556	$ 310	$ 402	$ 518	$ 760	$ 721	$ 642	$ 407	$ 1,786	$ 2,530	$ (1,017)
Income (loss) per share - basic:
Continuing operations (in usd per share)	$ 0.69	$ 0.37	$ 0.47	$ 0.58	$ 0.81	$ 0.74	$ 0.64	$ 0.40	$ 2.11	$ 2.58	$ (0.95)
Discontinued operations (in usd per share)	0	0	0	0	0	0	0	0	(0.01)	0	0
Net income (loss) per share - basic (in usd per share)	0.69	0.37	0.47	0.58	0.81	0.74	0.64	0.40	2.10	2.58	(0.95)
Income (loss) per share - diluted:
Continuing operations (in usd per share)	0.69	0.37	0.46	0.57	0.80	0.73	0.64	0.40	2.10	2.55	(0.95)
Discontinued operations (in usd per share)	0	0	0	0	0	0	0	0	(0.01)	0	0
Net income (loss) per share - diluted (in usd per share)	$ 0.69	$ 0.37	$ 0.46	$ 0.57	$ 0.80	$ 0.73	$ 0.64	$ 0.40	$ 2.09	$ 2.55	$ (0.95)
Weighted average shares:
Basic (in shares)	807	830	860	900	945	974	992	1,010	849	980	1,064
Diluted (in shares)	812	837	867	908	950	983	1,004	1,029	856	991	1,064