Condensed Consolidated Statements Of Changes In Equity (Unaudited) - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Retained Earnings (Deficit)	Treasury Stock	Accumulated Other Comprehensive Income (Loss)
Balance at Dec. 31, 2018	$ 1,516	$ 1	$ 1,954	$ 2,609	$ (1,760)	$ (1,288)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss)	400			400
Dividends declared	(107)			(107)
Stock compensation	(4)		(4)
Other comprehensive income (loss), net of tax	56					56
Treasury stock activity	(156)				(156)
Balance at Sep. 30, 2019	1,705	1	1,950	2,902	(1,916)	(1,232)
Balance at Jun. 30, 2019	1,628	1	1,943	2,783	(1,848)	(1,251)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss)	154			154
Dividends declared	(35)			(35)
Stock compensation	7		7
Other comprehensive income (loss), net of tax	19					19
Treasury stock activity	(68)				(68)
Balance at Sep. 30, 2019	1,705	1	1,950	2,902	(1,916)	(1,232)
Balance at Dec. 31, 2019	1,588	1	1,961	3,009	(1,974)	(1,409)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss)	447			447
Dividends declared	(126)			(126)
Stock compensation	3		3
Other comprehensive income (loss), net of tax	52					52
Treasury stock activity	(84)				(84)
Balance at Sep. 30, 2020	1,880	1	1,964	3,330	(2,058)	(1,357)
Balance at Jun. 30, 2020	1,678	1	1,961	3,150	(2,058)	(1,376)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss)	222			222
Dividends declared	(42)			(42)
Stock compensation	3		3
Other comprehensive income (loss), net of tax	19					19
Balance at Sep. 30, 2020	$ 1,880	$ 1	$ 1,964	$ 3,330	$ (2,058)	$ (1,357)