Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net earnings	$ 1,167	$ 2,363	$ 374	$ 7,036
Currency translation adjustments	(59)	2	(61)	(55)
Unrealized gain/(loss) on certain investments, net of tax of $0, $0, ($1) and $0			1	3
Unrealized (loss)/gain on derivative instruments [Abstract]
Unrealized (loss)/gain arising during period, net of tax of $1, ($22), $27 and ($61)	(89)	(4)	(106)	(97)
Reclassification adjustment for losses included in net earnings, net of tax of ($3), ($5), ($5) and ($24)	25	9	22	19
Total unrealized (loss)/gain on derivative instruments, net of tax	(64)	5	(84)	(78)
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	(22)	(35)	(67)	(106)
Net actuarial gain arising during the period, net of tax of $0, $0, $0 and $0				1
Amortization of actuarial losses included in net periodic pension cost, net of tax of ($60), ($72), ($182) and ($217)	117	219	350	657
Settlements and curtailments included in net income, net of tax of $0, ($3), $0 and $0				6
Pension and postretirement cost related to our equity method investments, net of tax of $0, $0, $1 and $1	9	(1)	17	(4)
Total defined benefit pension plans and other postretirement benefits, net of tax	104	183	300	554
Other comprehensive income/(loss), net of tax	(19)	190	156	424
Comprehensive loss related to noncontrolling interests	(15)	(2)	(22)	(12)
Comprehensive income, net of tax	$ 1,133	$ 2,551	$ 508	$ 7,448