Consolidated Statement Of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Consolidated Statement Of Comprehensive Income [Abstract]
Net Earnings (Loss)	$ 827	$ (944)	$ (5,165)
Other Comprehensive Income (Loss), Net of Tax
Foreign currency translation adjustment	(171)	(183)	668
Pension and other post-employment benefit plans	3	3	33
Other Comprehensive Income (Loss)	(168)	(180)	701
Comprehensive Income (Loss)	$ 659	$ (1,124)	$ (4,464)