Condensed Consolidated Statements of Stockholders' Equity (Deficit) - USD ($) $ in Millions	Total	Common Stock [Member]	Capital in Excess of Par Value [Member]	Accumulated Other Comprehensive Loss [Member]	Retained Earnings (Deficit) [Member]	Equity Attributable to Noncontrolling Interests [Member]
Balances at Dec. 31, 2019	$ (565)	$ 3		$ (460)	$ (2,351)	$ 2,243
Balance, shares at Dec. 31, 2019		338,446,000
Comprehensive income (loss)	587			(111)	581	117
Repurchase of common stock	(441)				(441)
Repurchase of common stock, shares		(3,287,000)
Share-based benefit plans	(33)		$ 2		(35)
Share-based benefit plans, shares		2,449,000
Cash dividends declared	(148)				(148)
Distributions	(154)					(154)
Other	51		(2)			53
Balance at Mar. 31, 2020	(703)	$ 3		(571)	(2,394)	2,259
Balance, shares at Mar. 31, 2020		337,608,000
Balances at Dec. 31, 2019	(565)	$ 3		(460)	(2,351)	2,243
Balance, shares at Dec. 31, 2019		338,446,000
Comprehensive income (loss)	2,638
Balance at Sep. 30, 2020	1,299	$ 3	185	(515)	(647)	2,273
Balance, shares at Sep. 30, 2020		338,370,000
Balances at Mar. 31, 2020	(703)	$ 3		(571)	(2,394)	2,259
Balance, shares at Mar. 31, 2020		337,608,000
Comprehensive income (loss)	1,225			9	1,079	137
Share-based benefit plans	93		93
Share-based benefit plans, shares		352,000
Distributions	(45)					(45)
Other	(2)		(5)			3
Balance at Jun. 30, 2020	568	$ 3	88	(562)	(1,315)	2,354
Balance, shares at Jun. 30, 2020		337,960,000
Comprehensive income (loss)	826			47	668	111
Share-based benefit plans	97		97
Share-based benefit plans, shares		410,000
Distributions	(194)					(194)
Other	2					2
Balance at Sep. 30, 2020	1,299	$ 3	185	(515)	(647)	2,273
Balance, shares at Sep. 30, 2020		338,370,000
Comprehensive income (loss)	1,707			13	1,426	268
Share-based benefit plans	108		108
Share-based benefit plans, shares		1,056,000.000
Cash dividends declared	(2)				(2)
Distributions	(233)					(233)
Other	13		1			12
Balance at Dec. 31, 2020	2,892	$ 3	294	(502)	777	2,320
Balance, shares at Dec. 31, 2020		339,426,000
Comprehensive income (loss)	1,591			11	1,423	157
Repurchase of common stock	(1,527)		(225)		(1,302)
Repurchase of common stock, shares		(8,477,000)
Share-based benefit plans	(75)		(75)
Share-based benefit plans, shares		2,765,000
Cash dividends declared	(163)				(163)
Distributions	(234)					(234)
Other	(2)		6			(8)
Balance at Mar. 31, 2021	2,482	$ 3		(491)	735	2,235
Balance, shares at Mar. 31, 2021		333,714,000
Balances at Dec. 31, 2020	2,892	$ 3	294	(502)	777	2,320
Balance, shares at Dec. 31, 2020		339,426,000
Comprehensive income (loss)	$ 5,726
Repurchase of common stock, shares	(29,343,000)
Balance at Sep. 30, 2021	$ 1,825	$ 3		(492)	(206)	2,520
Balance, shares at Sep. 30, 2021		313,502,000
Balances at Mar. 31, 2021	2,482	$ 3		(491)	735	2,235
Balance, shares at Mar. 31, 2021		333,714,000
Comprehensive income (loss)	1,680			16	1,450	214
Repurchase of common stock	(2,287)		(142)		(2,145)
Repurchase of common stock, shares		(11,261,000)
Share-based benefit plans	140		140
Share-based benefit plans, shares		372,000
Cash dividends declared	(161)				(161)
Distributions	(123)					(123)
Other	59		2			57
Balance at Jun. 30, 2021	1,790	$ 3		(475)	(121)	2,383
Balance, shares at Jun. 30, 2021		322,825,000
Comprehensive income (loss)	2,455			(17)	2,269	203
Repurchase of common stock	(2,329)		(130)		(2,199)
Repurchase of common stock, shares		(9,605,000)
Share-based benefit plans	127		127
Share-based benefit plans, shares		282,000
Cash dividends declared	(155)				(155)
Distributions	(144)					(144)
Other	81		$ 3			78
Balance at Sep. 30, 2021	$ 1,825	$ 3		$ (492)	$ (206)	$ 2,520
Balance, shares at Sep. 30, 2021		313,502,000