Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net earnings	$ 2,477	$ 1,579
Currency translation adjustments	27	34
Unrealized gain on certain investments, net of tax of $0 and ($1)	2	1
Unrealized (loss)/gain on derivative instruments [Abstract]
Unrealized (loss)/gain arising during period, net of tax of $0 and ($28)	(2)	52
Reclassification adjustment for losses included in net earnings, net of tax of $(1) and ($9)	4	16
Total unrealized gain on derivative instruments, net of tax	2	68
Defined benefit pension plans & other postretirement benefits [Abstract]
Amortization of prior service credits included in net periodic pension cost, net of tax of $10 and $16	(36)	(28)
Net actuarial gain arising during the period, net of tax of $0 and $(1)		3
Amortization of actuarial losses included in net periodic pension cost, net of tax of ($60) and ($72)	219	132
Pension and postretirement cost related to our equity method investments, net of tax of $1 and $1	(3)	(2)
Total defined benefit pension plans and other postretirement benefits, net of tax	180	105
Other comprehensive income, net of tax	211	208
Comprehensive income related to noncontrolling interests	(1)
Comprehensive income, net of tax	$ 2,687	$ 1,787