Consolidated Statements of Stockholders' 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, 2017	$ (4,995)	$ 4		$ (278)	$ (6,532)	$ 1,811
Balance, shares at Dec. 31, 2017		350,092,000.000
Comprehensive income (loss)	4,381			(8)	3,787	602
Repurchase of common stock	$ (1,530)	$ (1)	$ (103)		(1,426)
Repurchase of common stock, shares	(14,070,000.000)	(14,070,000.000)
Share-based benefit plans	$ 115		115
Share-based benefit plans, shares		6,873,000
Cash dividends declared	(496)				(496)
Distributions	(441)					(441)
Reclassification of stranded tax effects				(95)	95
Other	48		(12)			60
Balance at Dec. 31, 2018	(2,918)	$ 3		(381)	(4,572)	2,032
Balance, shares at Dec. 31, 2018		342,895,000
Comprehensive income (loss)	4,066			(79)	3,505	640
Repurchase of common stock	$ (1,031)		(302)		(729)
Repurchase of common stock, shares	(7,949,000)	(7,949,000)
Share-based benefit plans	$ 313		313
Share-based benefit plans, shares		3,500,000
Cash dividends declared	(555)				(555)
Distributions	(542)					(542)
Other	102		(11)			113
Balance at Dec. 31, 2019	(565)	$ 3		(460)	(2,351)	2,243
Balance, shares at Dec. 31, 2019		338,446,000
Comprehensive income (loss)	4,345			(42)	3,754	633
Repurchase of common stock	$ (441)				(441)
Repurchase of common stock, shares	(3,287,000)	(3,287,000)
Share-based benefit plans	$ 265		300		(35)
Share-based benefit plans, shares		4,267,000
Cash dividends declared	(150)				(150)
Distributions	(626)					(626)
Other	64		(6)			70
Balance at Dec. 31, 2020	$ 2,892	$ 3	$ 294	$ (502)	$ 777	$ 2,320
Balance, shares at Dec. 31, 2020		339,426,000