Consolidated Statement of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Change in cumulative foreign currency translation adjustment (less tax of $1, $1 and $1)	$ 1	$ 1	$ 1
Net gains (losses) arising during the period (less tax of $15, $2 and $5)	(15)	2	(5)
Reclassification adjustment for (gains) losses included in net earnings (less tax of $13, $2 and $1)	13	2	1
U.S. Plans
Amortization of pension and postretirement prior service costs and net loss:	56	54	196
Pension and postretirement liability adjustments:	76	7	6
Non-U.S. Plans
Amortization of pension and postretirement prior service costs and net loss:	0	0	0
Pension and postretirement liability adjustments:	$ (1)	$ (3)	$ (1)