Consolidated Statements of Changes in Equity and Redeemable Non-Controlling Interest - USD ($) $ in Millions	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income/(Loss)	Non- Controlling Interest in Consolidated Subsidiaries	Cumulative Effect, Period Of Adoption, Adjustment	Cumulative Effect, Period Of Adoption, Adjustment Retained Earnings
Beginning Balance (in shares) at Dec. 31, 2019		607,000,000	53,000,000
Beginning Balance at Dec. 31, 2019	$ 17,286	$ 6	$ (3,879)	$ 11,742	$ 9,629	$ (243)	$ 31	$ (10)	$ (10)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss)	(30)					(30)
Stock consideration issued for acquisition (in shares)		18,000,000
Stock consideration issued for acquisition	1,895			1,895
Exercise of common stock options (in shares)		1,000,000
Exercise of common stock options	26			26
Repurchases of common stock (in shares)			(14,000,000)
Repurchases of common stock	(1,247)		$ (1,247)
Payments relating to treasury shares	(72)		$ (72)
Stock-based compensation	105			105
Issuance under the employee stock purchase plan	33			33
Warrants issued to minority interest holders	3			3
Issuance of restricted stock (in shares)		2,000,000
Distributions of profits	(31)						(31)
Dividends paid to stockholders	(500)				(500)
Issuance of non-controlling interest	9						9
Net income (loss) attributable to non-controlling interest	5				(17)		22
Net income	1,580				1,580
Ending Balance (in shares) at Sep. 30, 2020		628,000,000	67,000,000
Ending Balance at Sep. 30, 2020	19,052	$ 6	$ (5,198)	13,804	10,682	(273)	31
Redeemable non-controlling interest, Beginning balance at Dec. 31, 2019	78
Increase (Decrease) in Temporary Equity [Roll Forward]
Stock-based compensation	9
Warrants issued to minority interest holders	2
Redeemable non-controlling interest	10
Net income (loss) attributable to non-controlling interest	(5)
Redeemable non-controlling interest, Ending balance at Sep. 30, 2020	94
Beginning Balance (in shares) at Jun. 30, 2020		609,000,000	65,000,000
Beginning Balance at Jun. 30, 2020	16,994	$ 6	$ (5,050)	11,856	10,462	(321)	41
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss)	48					48
Stock consideration issued for acquisition (in shares)		18,000,000
Stock consideration issued for acquisition	1,895			1,895
Exercise of common stock options (in shares)		1,000,000
Exercise of common stock options	4			4
Repurchases of common stock (in shares)			(2,000,000)
Repurchases of common stock	(148)		$ (148)
Stock-based compensation	32			32
Issuance under the employee stock purchase plan	17			17
Distributions of profits	(16)						(16)
Dividends paid to stockholders	(170)				(170)
Net income (loss) attributable to non-controlling interest	2				(4)		6
Net income	394				394
Ending Balance (in shares) at Sep. 30, 2020		628,000,000	67,000,000
Ending Balance at Sep. 30, 2020	19,052	$ 6	$ (5,198)	13,804	10,682	(273)	31
Redeemable non-controlling interest, Beginning balance at Jun. 30, 2020	95
Increase (Decrease) in Temporary Equity [Roll Forward]
Stock-based compensation	1
Net income (loss) attributable to non-controlling interest	(2)
Redeemable non-controlling interest, Ending balance at Sep. 30, 2020	$ 94
Beginning Balance (in shares) at Dec. 31, 2020	629,000,000	629,000,000	68,000,000
Beginning Balance at Dec. 31, 2020	$ 19,534	$ 6	$ (5,200)	13,845	11,039	(192)	36
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss)	(14)					(14)
Exercise of common stock options	$ 10			10
Payments relating to treasury shares (in shares)	(1,000,000)
Payments relating to treasury shares	$ (69)		$ (69)
Stock-based compensation	122			122
Issuance under the employee stock purchase plan	42			42
Issuance of restricted stock (in shares)		2,000,000
Distributions of profits	(21)						(21)
Dividends paid to stockholders	(561)				(561)
Net income (loss) attributable to non-controlling interest	9				(9)		18
Net income	$ 2,540				2,540
Ending Balance (in shares) at Sep. 30, 2021	631,000,000	631,000,000	69,000,000
Ending Balance at Sep. 30, 2021	$ 21,592	$ 6	$ (5,269)	14,019	13,009	(206)	33
Redeemable non-controlling interest, Beginning balance at Dec. 31, 2020	93
Increase (Decrease) in Temporary Equity [Roll Forward]
Stock-based compensation	3
Net income (loss) attributable to non-controlling interest	(9)
Redeemable non-controlling interest, Ending balance at Sep. 30, 2021	87
Beginning Balance (in shares) at Jun. 30, 2021		631,000,000	68,000,000
Beginning Balance at Jun. 30, 2021	21,116	$ 6	$ (5,267)	13,952	12,563	(174)	36
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss)	(32)					(32)
Exercise of common stock options	$ 2			2
Payments relating to treasury shares (in shares)	(1,000,000)
Payments relating to treasury shares	$ (2)		$ (2)
Stock-based compensation	41			41
Issuance under the employee stock purchase plan	24			24
Distributions of profits	(10)						(10)
Dividends paid to stockholders	(187)				(187)
Net income (loss) attributable to non-controlling interest	3				(4)		7
Net income	$ 637				637
Ending Balance (in shares) at Sep. 30, 2021	631,000,000	631,000,000	69,000,000
Ending Balance at Sep. 30, 2021	$ 21,592	$ 6	$ (5,269)	$ 14,019	$ 13,009	$ (206)	$ 33
Redeemable non-controlling interest, Beginning balance at Jun. 30, 2021	89
Increase (Decrease) in Temporary Equity [Roll Forward]
Stock-based compensation	1
Net income (loss) attributable to non-controlling interest	(3)
Redeemable non-controlling interest, Ending balance at Sep. 30, 2021	$ 87