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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Statement of Comprehensive Income [Abstract]      
Unrealized gain on certain investments, tax $ 1 $ (5) $ 0
Unrealized (loss)/gain on derivative instruments:      
Unrealized loss arising during period, tax 4 77 77
Reclassification adjustment for loss/(gain) included in net earnings, tax (43) (43) (4)
Defined benefit pension plans & other postretirement benefits:      
Net actuarial gain/(loss) arising during the period, tax 752 402 2,588
Amortization of actuarial losses included in net periodic pension cost, tax (288) (570) (367)
Settlements and curtailments included in net income, tax (7) (27) (101)
Pension and post retirement benefits related to our equity method investments, tax (7) (2) 15
Amortization of prior service cost included in net periodic pension cost, tax 31 (22) (12)
Prior service cost arising during the period, tax $ (18) $ (496) $ 3