Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income	Retained Earnings	Noncontrolling Interest
Beginning period (in shares) at Dec. 31, 2018		1,282,000,000
Beginning Balance at Dec. 31, 2018	$ 21,534	$ 1	$ 2,282	$ 80	$ 19,024	$ 147
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	3,843				3,855	(12)
Other comprehensive income (loss), net of tax	22			22
Issuances under employee stock purchase plan (in shares)		1,000,000
Issuances under employee stock purchase plan	63		63
Issuance under equity incentive plans (in shares)		6,000,000
Issuances under equity incentive plans	82		82
Stock-based compensation	319		319
Repurchases of common stock (in shares)		(22,000,000)
Repurchases of common stock	(1,496)		(62)		(1,434)
Dividends declared	(1,624)				(1,624)
Ending period (in shares) at Jun. 30, 2019		1,267,000,000
Ending Balance at Jun. 30, 2019	22,751	$ 1	2,684	102	19,829	135
Beginning period (in shares) at Mar. 31, 2019		1,274,000,000
Beginning Balance at Mar. 31, 2019	22,091	$ 1	2,494	130	19,326	140
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	1,875				1,880	(5)
Other comprehensive income (loss), net of tax	(28)			(28)
Issuance under equity incentive plans (in shares)		2,000,000
Issuances under equity incentive plans	41		41
Stock-based compensation	175		175
Repurchases of common stock (in shares)		(9,000,000)
Repurchases of common stock	(593)		(26)		(567)
Dividends declared	(810)				(810)
Ending period (in shares) at Jun. 30, 2019		1,267,000,000
Ending Balance at Jun. 30, 2019	$ 22,751	$ 1	2,684	102	19,829	135
Beginning period (in shares) at Dec. 31, 2019	1,266,000,000	1,266,000,000
Beginning Balance at Dec. 31, 2019	$ 22,650	$ 1	3,051	85	19,388	125
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Change in noncontrolling interest	10					10
Net income (loss)	(1,808)				(1,788)	(20)
Other comprehensive income (loss), net of tax	(15)			(15)
Issuances under employee stock purchase plan (in shares)		1,000,000
Issuances under employee stock purchase plan	66		66
Issuance under equity incentive plans (in shares)		8,000,000
Issuances under equity incentive plans	146		146
Stock-based compensation	309		309
Repurchases of common stock (in shares)		(21,000,000)
Repurchases of common stock	(1,476)		(61)		(1,415)
Dividends declared	$ (1,733)				(1,733)
Ending period (in shares) at Jun. 30, 2020	1,254,000,000	1,254,000,000
Ending Balance at Jun. 30, 2020	$ 18,142	$ 1	3,511	70	14,445	115
Beginning period (in shares) at Mar. 31, 2020		1,254,000,000
Beginning Balance at Mar. 31, 2020	22,179	$ 1	3,311	46	18,709	112
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Change in noncontrolling interest	10					10
Net income (loss)	(3,346)				(3,339)	(7)
Other comprehensive income (loss), net of tax	24			24
Issuance under equity incentive plans (in shares)		1,000,000
Issuances under equity incentive plans	35		35
Stock-based compensation	168		168
Repurchases of common stock (in shares)		(1,000,000)
Repurchases of common stock	(62)		(3)		(59)
Dividends declared	$ (866)				(866)
Ending period (in shares) at Jun. 30, 2020	1,254,000,000	1,254,000,000
Ending Balance at Jun. 30, 2020	$ 18,142	$ 1	$ 3,511	$ 70	$ 14,445	$ 115