CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Millions	Total	Common Shares ($1 par value)	Paid-In Capital	Retained Earnings (Deficit)	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2014-09	$ 5			$ 5
Balance at Dec. 31, 2015	58	$ 330	$ 0	(300)	$ (165)	$ 193
Balance (Accounting Standards Update 2014-09) at Dec. 31, 2015	63	330	0	(295)	(165)	193
Increase (Decrease) in Stockholders' Equity
Total comprehensive income (loss)	456			493	(70)	33
Shares issued	(24)	3	(27)
Shares retired:
Repurchased	(459)	(15)	(14)	(430)
Surrendered (non-cash)	(14)			(14)
Cash dividends declared	(128)			(128)
Dividends paid to noncontrolling interest	(31)					(31)
Stock-based compensation	41		41
Balance at Dec. 31, 2016	(96)	318	0	(374)	(235)	195
Increase (Decrease) in Stockholders' Equity
Total comprehensive income (loss)	779			533	170	76
Shares issued	(19)	2	(21)
Shares retired:
Repurchased	(331)	(9)	(8)	(314)
Surrendered (non-cash)	(15)	(1)		(14)
Cash dividends declared	(129)			(129)
Dividends paid to noncontrolling interest	(35)					(35)
Stock-based compensation	29		29
Balance at Dec. 31, 2017	183	310	0	(298)	(65)	236
Increase (Decrease) in Stockholders' Equity
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2018-02	0			59	(59)
Total comprehensive income (loss)	764			734	(3)	33
Shares issued	(9)	3	(4)	(8)
Shares retired:
Repurchased	(654)	(19)	(26)	(609)
Surrendered (non-cash)	(19)			(19)
Cash dividends declared	(137)			(137)
Dividends paid to noncontrolling interest	(89)					(89)
Stock-based compensation	30		30
Balance at Dec. 31, 2018	$ 69	$ 294	$ 0	$ (278)	$ (127)	$ 180