Condensed Consolidated Statements of Equity (Unaudited) - USD ($) $ in Millions	Total	Common Stock [member]	Additional Paid-in Capital [member]	Retained Earnings [member]	Accumulated Other Comprehensive Loss [member]	Non-Controlling Interests [member]	Net Parent Investment [Member]
Balance at Dec. 31, 2016	$ 3,823				$ (67)	$ (49)	$ 3,939
Net transfers to Parent	(9)						(9)
Issuance of common stock and reclassification of former Parent investment		$ 2	$ 3,928				$ (3,930)
Issuance of common stock and reclassification of former Parent investment (shares)		198,000,000
Share-based compensation	5		5
Share-based compensation (Shares)		1,000,000
Net income	2,465			$ 2,462		3
Other comprehensive income	14				14
Dividends and dividend equivalents	(295)		(110)	(185)
Dividends and dividend equivalents (Shares)		16,000,000
Distributions to noncontrolling interests	(2)					(2)
Balance at Jun. 30, 2017	6,001	$ 2	3,823	2,277	(53)	(48)
Balance (shares) at Jun. 30, 2017		215,000,000
Balance at Dec. 31, 2017	$ 5,962	$ 2	3,825	2,229	(45)	(49)
Balance (shares) at Dec. 31, 2017	214,845,244	215,000,000
Share-based compensation	$ 6		6
Net income	367			366		1
Other comprehensive income	37				37
Dividends and dividend equivalents	(266)			(266)
Repurchase of common stock	(348)		(250)	(98)
Repurchases of common stock (Shares)		(14,000,000)
Distributions to noncontrolling interests	(1)					(1)
Balance at Jun. 30, 2018	$ 5,757	$ 2	$ 3,581	$ 2,231	$ (8)	$ (49)
Balance (shares) at Jun. 30, 2018	201,178,717	201,000,000