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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Statement of Comprehensive Income [Abstract]        
Unrealized (loss)/gain on certain investments, tax     $ (1)  
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax [Abstract]        
Unrealized loss arising during period, tax $ 1 $ (22) 27 $ (61)
Reclassification adjustment for losses included in net earnings, tax (3) (5) (5) (24)
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 10 16 30 47
Net actuarial gains arising during the period, tax       (1)
Amortization of actuarial losses included in net periodic pension cost, tax $ (60) $ (72) (182) (217)
Settlements and curtailments included in net income, tax     (3)  
Pension and post retirement benefits related to our equity method investments, tax     $ 1 $ 1