Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Net earnings	$ 5,446	$ 4,585	$ 3,900
Currency translation adjustments	(97)	(64)	17
Unrealized (loss)/gain on derivative instruments:
Unrealized (loss)/gain arising during period, net of tax of $77, $42, and ($13)	(137)	(75)	25
Reclassification adjustment for loss/(gain) included in net earnings, net of tax of ($4), $9, and $3	7	(17)	(5)
Total unrealized (loss)/gain on derivative instruments, net of tax	(130)	(92)	20
Defined benefit pension plans & other postretirement benefits:
Net actuarial (loss)/gain arising during the period, net of tax of $2,588, ($3,437), and $1,382	(4,612)	6,143	(2,401)
Amortization of actuarial losses included in net periodic pension cost, net of tax of ($367), ($849), and ($752)	661	1,516	1,304
Settlements and curtailments included in net income, net of tax of ($101), ($33), and ($9)	180	59	15
Pension and postretirement (cost)/benefit related to our equity method investments, net of tax $15, ($13), and ($74)	(27)	24	127
Amortization of prior service cost included in net periodic pension cost, net of tax of ($12), ($6), and ($10)	21	10	18
Prior service cost arising during the period, net of tax of $3, $41, and $9	(5)	(74)	(16)
Total defined benefit pension plans & other postretirement benefits, net of tax	(3,782)	7,678	(953)
Other comprehensive (loss)/income, net of tax	(4,009)	7,522	(916)
Comprehensive income related to noncontrolling interests	10	9	3
Comprehensive income, net of tax	$ 1,447	$ 12,116	$ 2,987