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Pension and Other Postretirement Benefits Amounts reclassified from accumulated other comprehensive income (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]                
Income before income taxes $ 257     $ 293     $ 695 $ 646
Income Tax Expense (Benefit) (54)     (102)     (190) (196)
Net income 204 $ 174 $ 131 193 $ 147 $ 113 509 453
Reclassification out of Accumulated Other Comprehensive Income | Defined benefit plans                
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]                
Actuarial losses 21     28     70 76
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement 6           37  
Prior service credit (7)     (11)     (25) (36)
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment 0           (14)  
Income before income taxes 20     17     68 40
Income Tax Expense (Benefit) (5)     (6)     (13) (7)
Net income $ 15     $ 11     $ 55 $ 33