Consolidated Statements of Changes in Equity and Redeemable Non-Controlling Interest - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income/(Loss)	Non- Controlling Interest in Consolidated Subsidiaries
Beginning balance (in shares) at Dec. 31, 2020		629.0	68.0
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 loss	8					8
Exercise of common stock options (in shares)		0.0
Exercise of common stock options	3			3
Payments relating to treasury shares	(65)		$ (65)
Stock-based compensation	42			42
Issuance under the employee stock purchase plan	18			18
Issuance of restricted stock (in shares)		2.0
Distributions of profits	(11)						(11)
Dividends paid to stockholders	(187)				(187)
Net income/(loss) attributable to non-controlling interest	2				(4)		6
Net income	650				650
Ending balance (in shares) at Mar. 31, 2021		631.0	68.0
Ending balance at Mar. 31, 2021	19,994	$ 6	$ (5,265)	13,908	11,498	(184)	31
Redeemable non-controlling interest, beginning balance at Dec. 31, 2020	93
Increase (Decrease) in Temporary Equity [Roll Forward]
Net income/(loss) attributable to non-controlling interest	(2)
Redeemable non-controlling interest, ending balance at Mar. 31, 2021	$ 91
Beginning balance (in shares) at Dec. 31, 2021	631.0	631.0	70.0
Beginning balance at Dec. 31, 2021	$ 22,748	$ 6	$ (5,520)	14,069	14,350	(196)	39
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive loss	(25)					(25)
Exercise of common stock options	$ 15			15
Repurchases of common stock (in shares)	(3.7)		(3.0)
Repurchases of common stock	$ (475)		$ (475)
Payments relating to treasury shares (in shares)			(1.0)
Payments relating to treasury shares	(69)		$ (69)
Stock-based compensation	45			45
Issuance under the employee stock purchase plan	24			24
Issuance of restricted stock (in shares)		2.0
Distributions of profits	(13)						(13)
Dividends paid to stockholders	(214)				(214)
Net income/(loss) attributable to non-controlling interest	0				(10)		10
Net income	$ 667				667
Ending balance (in shares) at Mar. 31, 2022	633.0	633.0	74.0
Ending balance at Mar. 31, 2022	$ 22,703	$ 6	$ (6,064)	$ 14,153	$ 14,793	$ (221)	$ 36