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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Statement of Comprehensive Income [Abstract]        
Other Comprehensive Income (Loss), Tax $ (12) $ (52) $ (60) $ (133)
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax       (1)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax [Abstract]        
Unrealized loss arising during period, tax 25 1 30 27
Reclassification adjustment for losses included in net earnings, tax (7) (3) (6) (5)
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 5 10 18 30
Amortization of actuarial losses included in net periodic pension cost, tax (32) $ (60) (97) (182)
Other Comprehensive Income, Settlements and curtailments included in net income, tax       (3)
Pension and post retirement benefits related to our equity method investments, tax $ (3)   $ (5) $ 1
Common Stock, Dividends, Per Share, Declared     $ 4.11 $ 3.42