Consolidated Statement of Comprehensive Income (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net earnings	$ 3,900	$ 4,018	$ 3,307
Currency translation adjustments	17	(35)	16
Unrealized loss on certain investments, net of tax of $0, $1 and $0		(2)
Effective portion recognized in other comprehensive loss, net of taxes:	25	(13)	37
Effective portion reclassified out of Accumulated other comprehensive loss into earnings, net of taxes:	(5)	(16)	(9)
Total unrealized gain/(loss) on derivative instruments, net of tax	20	(29)	28
Prior service cost arising during the period, net of tax of $9, ($195) and $4	(16)	338	(8)
Amortization of prior service cost included in net periodic pension cost, net of tax of ($10), ($54) and ($57)	18	94	113
Net actuarial loss arising during the period, net of tax of $1,382, $2,297 and $1,506	(2,401)	(3,993)	(2,625)
Amortization of actuarial losses included in net periodic pension cost, net of tax of ($752), ($523) and ($305)	1,304	909	529
Settlements and curtailments included in net income, net of tax of ($9), ($25) and ($5)	(15)	(42)	(9)
Pension and post retirement benefits related to our equity method investments, net of tax ($74), $38 and ($34)	127	(66)	57
Total defined benefit pension plans & other postretirement benefits, net of tax	953	2,676	1,925
Other comprehensive loss, net of tax	(916)	(2,742)	(1,881)
Comprehensive income/(loss) related to non-controlling interest	3	(1)	1
Comprehensive income, net of tax	2,987	1,275	1,427
Accumulated Other Comprehensive Loss [Member]
Other comprehensive loss, net of tax	$ (916)	$ (2,742)	$ (1,881)