CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Comprehensive income:
Net earnings (loss)	$ (76)	$ 748	$ 582
Other comprehensive income (loss):
Foreign currency translation adjustments	26	(54)	32
Changes in unamortized actuarial loss, net of tax (expense) benefit of ($73) in 2019, ($235) in 2018 and $2 in 2017	225	733	(132)
Changes in unamortized net prior service credit, net of tax (expense) benefit of ($1) in 2019, $3 in 2018 and $2 in 2017	(3)	(7)	(5)
Unrealized gains on available-for-sale securities	0	0	2
Total comprehensive income	$ 172	$ 1,420	$ 479