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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Statement of Comprehensive Income [Abstract]        
Other Comprehensive Income (Loss), Tax $ (18) $ (31) $ (48) $ (81)
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax   (1)   (1)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax [Abstract]        
Unrealized loss arising during period, tax 8 26 5 26
Reclassification adjustment for losses included in net earnings, tax   (1) 1 (2)
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 7 10 13 20
Amortization of actuarial losses included in net periodic pension cost, tax $ (33) (62) (65) (122)
Other Comprehensive Income, Settlements and curtailments included in net income, tax   $ (3)   (3)
Pension and post retirement benefits related to our equity method investments, tax     $ (2) $ 1
Common Stock, Dividends, Per Share, Declared $ 4.11 $ 3.42 $ 4.11 $ 3.42