CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock, at Cost	Non-controlling Interests
Balance, shares at Dec. 31, 2020		133.0
Balance, value at Dec. 31, 2020	$ 6,809	$ 2	$ 2,841	$ 9,303	$ (21)	$ (5,366)	$ 50
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,134			1,100			34
Other comprehensive income (loss), net of taxes	11				11
Dividends declared	(157)			(157)
Distributions to noncontrolling interest partners	(43)						(43)
Issuance of common stock under benefit plans	11		(27)			38
Stock-based compensation expense	39		39
Exercise of stock options, shares		1.0
Exercise of stock options	68		12			56
Shares to cover employee payroll tax withholdings on stock issued under stock-based compensation plans	(22)		(10)			$ (12)
Purchases of treasury stock, shares		(12.0)				(12.5)
Purchases of treasury stock	(1,910)		(300)			$ (1,610)
Balance, shares at Jun. 30, 2021		122.0
Balance, value at Jun. 30, 2021	5,940	$ 2	2,555	10,246	(10)	(6,894)	41
Balance, Value at Dec. 31, 2020	82
Redeemable Non-controlling Interest [Abstract]
Net income	6
Distributions to noncontrolling interest partners	(10)
Balance, Value at Jun. 30, 2021	78
Balance, shares at Mar. 31, 2021		131.0
Balance, value at Mar. 31, 2021	6,790	$ 2	2,824	9,690	(31)	(5,740)	45
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	648			631			17
Other comprehensive income (loss), net of taxes	21				21
Dividends declared	(75)			(75)
Distributions to noncontrolling interest partners	(21)						(21)
Issuance of common stock under benefit plans	6		2			4
Stock-based compensation expense	21		21
Exercise of stock options	51		9			42
Shares to cover employee payroll tax withholdings on stock issued under stock-based compensation plans	(1)		(1)
Purchases of treasury stock, shares		(9.0)
Purchases of treasury stock	(1,500)		(300)			(1,200)
Balance, shares at Jun. 30, 2021		122.0
Balance, value at Jun. 30, 2021	5,940	$ 2	2,555	10,246	(10)	(6,894)	41
Balance, Value at Mar. 31, 2021	79
Redeemable Non-controlling Interest [Abstract]
Net income	2
Distributions to noncontrolling interest partners	(3)
Balance, Value at Jun. 30, 2021	78
Balance, shares at Dec. 31, 2021		119.0
Balance, value at Dec. 31, 2021	6,483	$ 2	2,260	7,649	(14)	(3,453)	39
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	619			589			30
Other comprehensive income (loss), net of taxes	(9)				(9)
Dividends declared	(155)			(155)
Distributions to noncontrolling interest partners	(30)						(30)
Issuance of common stock under benefit plans, shares		1.0
Issuance of common stock under benefit plans	14		(40)			54
Stock-based compensation expense	37		37
Exercise of stock options, shares		1.0
Exercise of stock options	68		3			65
Shares to cover employee payroll tax withholdings on stock issued under stock-based compensation plans	(27)		(10)			$ (17)
Purchases of treasury stock, shares		(4.0)				(4.0)
Purchases of treasury stock	(550)					$ (550)
Balance, shares at Jun. 30, 2022		117.0
Balance, value at Jun. 30, 2022	6,450	$ 2	2,250	8,083	(23)	(3,901)	39
Balance, Value at Dec. 31, 2021	79
Redeemable Non-controlling Interest [Abstract]
Net income	4
Distributions to noncontrolling interest partners	(6)
Balance, Value at Jun. 30, 2022	77
Balance, shares at Mar. 31, 2022		117.0
Balance, value at Mar. 31, 2022	6,415	$ 2	2,226	7,926	(16)	(3,761)	38
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	248			234			14
Other comprehensive income (loss), net of taxes	(7)				(7)
Dividends declared	(77)			(77)
Distributions to noncontrolling interest partners	(13)						(13)
Issuance of common stock under benefit plans	7		1			6
Stock-based compensation expense	19		19
Exercise of stock options, shares		1.0
Exercise of stock options	58		4			54
Purchases of treasury stock, shares		(1.0)
Purchases of treasury stock	(200)					(200)
Balance, shares at Jun. 30, 2022		117.0
Balance, value at Jun. 30, 2022	6,450	$ 2	$ 2,250	$ 8,083	$ (23)	$ (3,901)	$ 39
Balance, Value at Mar. 31, 2022	78
Redeemable Non-controlling Interest [Abstract]
Net income	2
Distributions to noncontrolling interest partners	(3)
Balance, Value at Jun. 30, 2022	$ 77