Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net earnings (loss)	$ 29	$ 10
Other comprehensive income (loss):
Foreign currency translation gain (loss), net of income taxes	0	0
Net unrealized gain on hedging derivatives, net of income taxes	0	0
Net unrecognized gain (loss) on postretirement obligations, net of income taxes	(1)	(14)
Other comprehensive loss, net of income tax	(1)	(14)
Total comprehensive income (loss)	$ 28	$ (4)