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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Statement of Comprehensive Income [Abstract]        
Other Comprehensive Income (Loss), Tax     $ (31) $ 294
Unrealized gain on certain investments, tax $ 0 $ (2) 1 (3)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax Effect [Abstract]        
Unrealized loss arising during period, tax 9 (14) (23) 37
Reclassification adjustment for losses included in net earnings, tax (12) (10) (24) (16)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax, Portion Attributable to Parent [Abstract]        
Amortization of prior service cost included in net periodic pension cost, tax 8 (6) 15 (11)
Net actuarial gains arising during the period, tax 34 (17) 215 (17)
Amortization of actuarial losses included in net periodic pension cost, tax (73) (145) (145) (282)
Settlements and curtailments included in net income, tax (1) (2) (7) (2)
Pension and post retirement benefits related to our equity method investments, tax $ 3 $ 0 $ (1) $ 0