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Consolidated Statement of Comprehensive Income (Parenthetical) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Statement of Other Comprehensive Income [Abstract]      
Unrealized loss on certain investments, taxes $ 0 $ 1 $ 0
Unrealized (loss)/gain on derivative instruments:      
Unrealized gain/(loss) arising during period, taxes (13) 7 (22)
Reclassification adjustment for (gain)/loss included in net earnings, taxes 3 9 5
Prior service cost arising during the period, taxes 9 (195) 4
Amortization of prior service cost included in net periodic pension cost, taxes (10) (54) (57)
Net actuarial loss arising during the period, taxes 1,382 2,297 1,506
Amortization of actuarial losses included in net periodic pension cost, taxes (752) (523) (305)
Settlements and curtailments included in net income, taxes (9) (25) (5)
Pension and post retirement benefits related to our equity method investments, taxes $ (74) $ 38 $ (34)