Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Comprehensive Income (Loss), Net of Tax [Abstract]
Net earnings (loss)	$ (252)	$ 473
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Cumulative translation adjustments	2	1
Amortization of net actuarial loss and prior service cost	12	10
Total other comprehensive income (loss), net of tax	14	11
Total comprehensive income (loss), net of tax	$ (238)	$ 484