CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($) shares in Millions, $ in Millions	Total	Cumulative effect from the adoption of new accounting standard	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income	Retained Earnings	Retained Earnings Cumulative effect from the adoption of new accounting standard	Noncontrolling Interest
Beginning balance (in shares) at Dec. 31, 2019			1,266
Beginning balance at Dec. 31, 2019	$ 22,650	$ (7)	$ 1	$ 3,051	$ 85	$ 19,388	$ (7)	$ 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, net of tax	(15)				(15)
Issuances under employee stock purchase plan (in shares)			1
Issuances under employee stock purchase plan	66			66
Issuance under equity incentive plans (in shares)			8
Issuances under equity incentive plans	146			146
Stock-based compensation	309			309
Repurchases of common stock (in shares)			(21)
Repurchases of common stock	(1,476)			(61)		(1,415)
Dividends declared	(1,733)					(1,733)
Ending balance (in shares) at Jun. 30, 2020			1,254
Ending balance at Jun. 30, 2020	18,142		$ 1	3,511	70	14,445		115
Beginning balance (in shares) at Mar. 31, 2020			1,254
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, net of tax	24				24
Issuance under equity incentive plans (in shares)			1
Issuances under equity incentive plans	35			35
Stock-based compensation	168			168
Repurchases of common stock (in shares)			(1)
Repurchases of common stock	(62)			(3)		(59)
Dividends declared	(866)					(866)
Ending balance (in shares) at Jun. 30, 2020			1,254
Ending balance at Jun. 30, 2020	$ 18,142		$ 1	3,511	70	14,445		115
Beginning balance (in shares) at Dec. 31, 2020	1,254		1,254
Beginning balance at Dec. 31, 2020	$ 18,221		$ 1	3,880	(60)	14,381		19
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	3,239					3,251		(12)
Other comprehensive income, net of tax	99				99
Issuances under employee stock purchase plan (in shares)			1
Issuances under employee stock purchase plan	76			76
Issuance under equity incentive plans (in shares)			6
Issuances under equity incentive plans	24			24
Stock-based compensation	308			308
Repurchases of common stock (in shares)			(7)
Repurchases of common stock	(448)			(17)		(431)
Dividends declared	$ (1,809)					(1,809)
Ending balance (in shares) at Jun. 30, 2021	1,254		1,254
Ending balance at Jun. 30, 2021	$ 19,710		$ 1	4,271	39	15,392		7
Beginning balance (in shares) at Mar. 31, 2021			1,254
Beginning balance at Mar. 31, 2021	18,964		$ 1	4,092	38	14,821		12
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	1,517					1,522		(5)
Other comprehensive income, net of tax	1				1
Issuance under equity incentive plans (in shares)			1
Issuances under equity incentive plans	12			12
Stock-based compensation	168			168
Repurchases of common stock (in shares)			(1)
Repurchases of common stock	(49)			(1)		(48)
Dividends declared	$ (903)					(903)
Ending balance (in shares) at Jun. 30, 2021	1,254		1,254
Ending balance at Jun. 30, 2021	$ 19,710		$ 1	$ 4,271	$ 39	$ 15,392		$ 7