Consolidated Statements of Stockholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	AOCI Attributable to Parent	Retained Earnings [Member]	Noncontrolling Interest [Member]
Beginning period (in shares) at Dec. 31, 2015		1,422
Beginning Balance at Dec. 31, 2015	$ 19,113	$ 1	$ 444	$ 88	$ 18,001	$ 579
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Change in noncontrolling interest	(90)					(90)
Net income (loss)	13,488				13,501	(13)
Other comprehensive income, net of tax	190			190
Issuances under employee stock purchase plan, Shares		1
Issuances under employee stock purchase plan	84		84
Issuance under equity incentive plans, Shares		13
Issuances under equity incentive plans	128		128
Tax benefits from employee stock plans	186		186
Stock-based compensation	381		381
Repurchases of common stock, shares		(126)
Repurchases of common stock	(11,185)	$ 0	(302)		(10,883)
Warrants settlement	(469)		(469)
Convertible notes settlement	(95)		(95)
Convertible note hedges settlement	95		95
Dividends declared	(2,465)				(2,465)
Reclassification of conversion spread of convertible notes	(733)		(733)
Reclassification of convertible note hedges	733		733
Reclassification to equity component of currently redeemable convertible notes	2		2
Ending period (in shares) at Dec. 31, 2016		1,310
Ending Balance at Dec. 31, 2016	19,363	$ 1	454	278	18,154	476
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Change in noncontrolling interest	(436)		(3)			(433)
Net income (loss)	4,644				4,628	16
Other comprehensive income, net of tax	(113)			(113)
Issuances under employee stock purchase plan, Shares		1
Issuances under employee stock purchase plan	83		83
Issuance under equity incentive plans, Shares		11
Issuances under equity incentive plans	146		146
Stock-based compensation	618		618
Repurchases of common stock, shares		(14)
Repurchases of common stock	(1,062)		(34)		(1,028)
Dividends declared	$ (2,742)				(2,742)
Ending period (in shares) at Dec. 31, 2017	1,308	1,308
Ending Balance at Dec. 31, 2017	$ 20,501	$ 1	1,264	165	19,012	59
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Change in noncontrolling interest	83		0			83
Net income (loss)	5,460				5,455	5
Other comprehensive income, net of tax	208			208
Issuances under employee stock purchase plan, Shares		2
Issuances under employee stock purchase plan	91		91
Issuance under equity incentive plans, Shares		14
Issuances under equity incentive plans	197		197
Stock-based compensation	842		842
Repurchases of common stock, shares		(42)
Repurchases of common stock	(3,052)		(112)		(2,940)
Dividends declared	$ (2,986)				(2,986)
Ending period (in shares) at Dec. 31, 2018	1,282	1,282
Ending Balance at Dec. 31, 2018	$ 21,534	$ 1	$ 2,282	$ 80	$ 19,024	$ 147