Supplementary Data - Quarterly Financial Data - Unaudited (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Quarterly Financial Data [Abstract]
Net revenues	$ 2,868	$ 2,606	$ 2,668	$ 2,129	$ 2,236	$ 2,083	$ 2,156	$ 2,161	$ 10,271	$ 8,636	$ 8,650
Gross profit	2,126	1,950	2,095	1,627	1,680	1,553	1,624	1,643	7,798	6,500	6,627
Income from continuing operations	781	621	709	431	469	210	377	460	2,542	1,516	2,128
Income (loss) from discontinued operations, net of income taxes	64	43	37	2,981	87	100	25	58	3,125	270	402
Net income (loss)	$ 845	$ 664	$ 746	$ 3,412	$ 556	$ 310	$ 402	$ 518	$ 5,667	$ 1,786	$ 2,530
Income (loss) per share - basic:
Continuing operations (in usd per share)	$ 1.14	$ 0.89	$ 1.01	$ 0.57	$ 0.58	$ 0.25	$ 0.44	$ 0.51	$ 3.58	$ 1.79	$ 2.17
Discontinued operations (in usd per share)	0.09	0.06	0.05	3.96	0.11	0.12	0.03	0.07	4.40	0.31	0.41
Net income (loss) per share - basic (in usd per share)	1.23	0.95	1.06	4.53	0.69	0.37	0.47	0.58	7.98	2.10	2.58
Income (loss) per share - diluted:
Continuing operations (in usd per share)	1.12	0.88	1.00	0.57	0.58	0.25	0.43	0.51	3.54	1.77	2.15
Discontinued operations (in usd per share)	0.09	0.06	0.05	3.94	0.11	0.12	0.03	0.06	4.35	0.32	0.40
Net income (loss) per share - diluted (in usd per share)	$ 1.21	$ 0.94	$ 1.05	$ 4.51	$ 0.69	$ 0.37	$ 0.46	$ 0.57	$ 7.89	$ 2.09	$ 2.55
Weighted average shares:
Basic (in shares)	688	696	703	753	807	830	860	900	710	849	980
Diluted (in shares)	697	708	711	757	812	837	867	908	718	856	991