Consolidated Statements of Changes in Equity - USD ($) $ in Millions	Common Stock	Accumulated Other Comprehensive Loss Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Loss	Retained Earnings Impact of Change to FIFO	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Retained Earnings	Noncontrolling Interest	Impact of Change to FIFO	Cumulative Effect, Period of Adoption, Adjustment	Total
Balances at Dec. 31, 2017	$ 1	$ (7)	$ (354)	$ 23	$ 7	$ 3,750	$ 11	$ 23		$ 3,408
Comprehensive income (loss):
Net earnings						3		20		3
Other comprehensive income (loss), net of tax			(49)				(1)			(50)
Repurchase of common stock						(5)				(5)
Addition to noncontrolling interests							4			4
Reduction to noncontrolling interests						(1)	(3)			(4)
Dividends on common stock						(7)				(7)
Balances at Dec. 31, 2018	1		(410)			3,770	11			3,372
Comprehensive income (loss):
Net earnings						287		4		287
Other comprehensive income (loss), net of tax			(30)							(30)
Repurchase of common stock						(17)				(17)
Reduction to noncontrolling interests							(1)			(1)
Dividends on common stock						(10)				(10)
Balances at Dec. 31, 2019	1		(440)		$ (3)	4,030	10		$ (3)	3,601
Comprehensive income (loss):
Net earnings						283		$ 44		283
Other comprehensive income (loss), net of tax			(31)				1			(30)
Repurchase of common stock						(13)				(13)
Dividends on common stock						(10)				(10)
Balances at Dec. 31, 2020	$ 1		$ (471)			$ 4,287	$ 11			$ 3,828