Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net earnings	$ 1,583	$ 511
Other comprehensive income (loss), net of tax:
Cumulative translation adjustments	3	(6)
Amortization of net actuarial loss	14	15
Total other comprehensive income, net of tax	17	9
Total comprehensive income	$ 1,600	$ 520