Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net earnings	$ 1,853	$ 2,279	$ 5,065	$ 3,264
Currency translation adjustments	44	(10)	121	(3)
Unrealized gain on certain investments, net of tax of $0, ($1), $0, and ($2)		2		1
Unrealized (loss)/gain on derivative instruments [Abstract]
Unrealized gain arising during period, net of tax of ($61), ($30), ($22), and ($7)	40	13	111	54
Reclassification adjustment for losses included in net earnings, net of tax of ($24), ($32), ($5), and ($8)	10	15	44	58
Total unrealized gain on derivative instruments, net of tax	50	28	155	112
Defined benefit pension plans & other postretirement benefits [Abstract]
Amortization of prior service credits included in net periodic pension cost, net of tax of $47, $23, $16, and $8	(27)	(15)	(84)	(42)
Net actuarial gain/(loss) arising during the period, net of tax of ($1), $215, $0, and $0		(1)	3	(388)
Amortization of actuarial losses included in net periodic pension cost, net of tax of ($217), ($217), ($72), and ($72)	131	131	394	392
Settlements and curtailments included in net income, net of tax of $0, ($7), $0, and $0				14
Pension and postretirement (cost)/benefit related to our equity method investments, net of tax of $1, ($2), $0, and ($1)		2	(2)	4
Total defined benefit pension plans and other postretirement benefits, net of tax	104	117	311	(20)
Other comprehensive income, net of tax	198	137	587	90
Comprehensive loss related to noncontrolling interests		(1)	(1)	(1)
Comprehensive income, net of tax	$ 2,051	$ 2,415	$ 5,651	$ 3,353