Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net earnings	$ 2,149	$ 2,477
Currency translation adjustments	1	27
Unrealized gain/(loss) on certain investments, net of tax of $0, $0, ($1) and $0	1	2
Unrealized (loss)/gain on derivative instruments [Abstract]
Unrealized (loss)/gain arising during period, net of tax of $1, ($22), $27 and ($61)	11	(2)
Reclassification adjustment for losses included in net earnings, net of tax of ($3), ($5), ($5) and ($24)	(2)	4
Total unrealized gain on derivative instruments, net of tax	9	2
Defined benefit pension plans & other postretirement benefits [Abstract]
Amortization of prior service credits included in net periodic pension cost, net of tax of $10, $16, $30 and $47	(23)	(36)
Amortization of actuarial losses included in net periodic pension cost, net of tax of ($60), ($72), ($182) and ($217)	118	219
Pension and postretirement cost related to our equity method investments, net of tax of $0, $0, $1 and $1	8	(3)
Total defined benefit pension plans and other postretirement benefits, net of tax	103	180
Other comprehensive income, net of tax	114	211
Comprehensive income related to noncontrolling interests		(1)
Comprehensive income, net of tax	$ 2,263	$ 2,687