Condensed Consolidated Statements of Changes in Equity (unaudited) - USD ($) $ in Millions		Total	Common Stock		Additional paid-in capital	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive Loss	Total Stockholders’ Equity	Non controlling Interests
Balance, beginning of period at Dec. 31, 2018		$ 15,403	$ 3		$ 13,657	$ (12)	$ 1,528	$ (72)	$ 15,104	$ 299
Balance, beginning of period (in shares) at Dec. 31, 2018	[1]		309,005,272
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		216					217		217	(1)
Other comprehensive income (loss), net of tax of $1.9, $3.7, $(6.6), and $(5.8), respectively		(27)						(27)	(27)
Comprehensive income		189
Dividends declared, $0.44/share		(136)					(136)		(136)
Stock-based compensation		1			1				1
Distributions to noncontrolling interests		(3)								(3)
Contributions from noncontrolling interests		3								3
Balance, end of period at Mar. 31, 2019		15,456	$ 3		13,658	(12)	1,620	(111)	15,158	298
Balance, end of period (in shares) at Mar. 31, 2019	[1]		309,005,272
Balance, beginning of period at Dec. 31, 2019		$ 15,586	$ 3		13,660	(12)	1,681	(95)	15,237	349
Balance, beginning of period (in shares) at Dec. 31, 2019		309,005,272	309,005,272	[1]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		$ 230					240		240	(10)
Other comprehensive income (loss), net of tax of $1.9, $3.7, $(6.6), and $(5.8), respectively		(21)						(21)	(21)
Comprehensive income		209
Dividends declared, $0.44/share		$ (136)					(136)		(136)
Release of common stock held in trust		213
Stock-based compensation		$ 7			7				7
Distributions to noncontrolling interests		(1)								(1)
Contributions from noncontrolling interests		244								244
Balance, end of period at Mar. 31, 2020		$ 15,908	$ 3		$ 13,667	$ (12)	$ 1,784	$ (116)	$ 15,326	$ 582
Balance, end of period (in shares) at Mar. 31, 2020		309,005,485	309,005,485	[1]

[1] (*) Par value of share amounts is $0.01