Consolidated Statements of Changes in Equity - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Retained Earnings (Deficit)	Treasury Stock	Accumulated Other Comprehensive Income (Loss)
Balance at Dec. 31, 2015	$ 1,490	$ 1	$ 1,978	$ 848	$ (492)	$ (845)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss)	573			573
Dividends declared	(98)			(98)
Additional paid-in capital	(14)		(14)
Other comprehensive income (loss), net of tax	(106)					(106)
Treasury stock activity	(192)				(192)
Balance at Dec. 31, 2016	1,653	1	1,964	1,323	(684)	(951)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss)	479			479
Dividends declared	(115)			(115)
Additional paid-in capital	(22)		(22)
Other comprehensive income (loss), net of tax	51					51
Treasury stock activity	(288)				(288)
Balance at Dec. 31, 2017	1,758	1	1,942	1,687	(972)	(900)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss)	836			836
Dividends declared	(132)			(132)
Additional paid-in capital	12		12
Other comprehensive income (loss), net of tax	(175)					(175)
Treasury stock activity	(788)				(788)
Cumulative Effect of ASU 2014-09	5			5
Cumulative Effect of ASU 2016-01				11		(11)
Cumulative Effect of ASU 2018-02				202		(202)
Balance at Dec. 31, 2018	$ 1,516	$ 1	$ 1,954	$ 2,609	$ (1,760)	$ (1,288)