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Stockholders' Equity - Changes in Equity (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	$ 1,539	$ 1,215	$ 1,442	$ 1,114
Net income (loss)	(66)	127	35	238
Net income	(66)	127	36	237
Other comprehensive income	360	(56)	397	(47)
Other comprehensive income including portion attributable to nonredeemable noncontrolling interest	361	(54)	393	(46)
Common stock dividends	(14)	(15)	(29)	(30)
Distributions to noncontrolling interests	(11)	(3)	(12)	(4)
Increase from business combination	1		8
Purchase of noncontrolling interests				0
Common stock share repurchases		(25)	(25)	(25)
Stock compensation	4	6	8	11
Stock withheld for employee taxes			(6)	(6)
Ending Balance	1,814	1,251	1,814	1,251
Common Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	2	2	2	2
Ending Balance	2	2	2	2
Additional Paid-in Capital [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	2,372	2,350	2,368	2,354
Purchase of noncontrolling interests				(9)
Stock compensation	4	6	8	11
Ending Balance	2,376	2,356	2,376	2,356
Retained Earnings [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	538	181	456	86
Net income (loss)	(68)	124	30	232
Common stock dividends	(14)	(15)	(29)	(30)
Ending Balance	456	290	456	290
Treasury Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(150)	(93)	(119)	(87)
Common stock share repurchases		(25)	(25)	(25)
Stock withheld for employee taxes			(6)	(6)
Ending Balance	(150)	(118)	(150)	(118)
AOCI Attributable to Parent [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(1,328)	(1,336)	(1,362)	(1,342)
Other comprehensive income	360	(49)	394	(41)
Ending Balance	(968)	(1,385)	(968)	(1,385)
Non-Controlling Interests [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	105	111	97	101
Net income	2	3	6	5
Other comprehensive income	1	(5)	(1)	(5)
Distributions to noncontrolling interests	(11)	(3)	(12)	(4)
Increase from business combination	1		8
Purchase of noncontrolling Interests				9
Ending Balance	$ 98	$ 106	$ 98	$ 106
Accounting Standards Update 2016-02 [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Impact on retained earnings					$ (1)
Accounting Standards Update 2016-02 [Member] \| Retained Earnings [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Impact on retained earnings					$ (1)
Accounting Standards Update 2016-01 [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Impact on retained earnings						$ 0
Accounting Standards Update 2016-01 [Member] \| Retained Earnings [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Impact on retained earnings						2
Accounting Standards Update 2016-01 [Member] \| AOCI Attributable to Parent [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Impact on retained earnings						$ (2)