CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Comprehensive income:
Net earnings (loss)	$ 2,607	$ 797	$ (76)
Other comprehensive income (loss):
Foreign currency translation adjustments	(11)	18	26
Changes in unamortized actuarial loss, net of tax expense of $112 in 2021, $22 in 2020 and $73 in 2019	351	62	225
Changes in unamortized net prior service credit, net of tax (expense) benefit of $1 in 2021, $0 in 2020 and ($1) in 2019	3	2	(3)
Total comprehensive income	$ 2,950	$ 879	$ 172