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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Statement of Comprehensive Income [Abstract]        
Unrealized gain on certain investments, tax $ (1) $ 1 $ (1)  
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax Effect [Abstract]        
Unrealized loss arising during period, tax 26 (11) 26 $ (39)
Reclassification adjustment for losses included in net earnings, tax (1) (10) (2) (19)
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 15 20 31
Net actuarial gains arising during the period, tax       (1)
Amortization of actuarial losses included in net periodic pension cost, tax (62) $ (73) (122) (145)
Settlements and curtailments included in net income, tax (3)   (3)  
Pension and post retirement benefits related to our equity method investments, tax   $ 1 $ 1