CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net earnings	$ 317	$ 24	$ 586	$ 181
Other comprehensive income (loss):
Foreign currency translation adjustments	(16)	9	(31)	11
Changes in actuarial loss, net of tax expense of $63, $24, $82, and $50	199	43	253	72
Amortization of net prior service credit, net of tax benefit of $1, $1, $1, and $1	0	(3)	(1)	(4)
Unrealized gains on available-for-sale securities	0	0	0	1
Total other comprehensive income	183	49	221	80
Total comprehensive income	$ 500	$ 73	$ 807	$ 261