Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net earnings/(loss)	$ 1,761	$ (234)	$ 3,212	$ 985
Currency translation adjustments	43	(16)	77	7
Unrealized (loss)/gain on certain investments, net of tax of $0, $1, $1, and $0	(1)	1		(1)
Unrealized (loss)/gain on derivative instruments [Abstract]
Unrealized gain/(loss) arising during period, net of tax of ($39), ($23), ($11), and $9	19	(17)	71	41
Reclassification adjustment for losses included in net earnings, net of tax of ($19), ($24), ($10), and ($12)	18	20	34	43
Total unrealized gain on derivative instruments, net of tax	37	3	105	84
Defined benefit pension plans & other postretirement benefits [Abstract]
Amortization of prior service credits included in net periodic pension cost, net of tax of $31, $15, $15, and $8	(29)	(13)	(57)	(27)
Net actuarial gain/(loss) arising during the period, net of tax of ($1), $215, $0, and $34		(59)	3	(387)
Amortization of actuarial losses included in net periodic pension cost, net of tax of ($145), ($145), ($73), and ($73)	131	130	263	261
Settlements and curtailments included in net income, net of tax of $0, ($7), $0, and ($1)		3		14
Pension and postretirement (cost)/benefit related to our equity method investments, net of tax of $1, ($1), $0, and $3		(6)	(2)	2
Total defined benefit pension plans and other postretirement benefits, net of tax	102	55	207	(137)
Other comprehensive income/(loss), net of tax	181	43	389	(47)
Comprehensive loss related to noncontrolling interests	(1)	(1)	(1)
Comprehensive income/(loss), net of tax	$ 1,941	$ (192)	$ 3,600	$ 938