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Pension and Other Postretirement Benefits Amounts reclassified from accumulated other comprehensive income (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]            
Income before income taxes $ 260   $ 201   $ 438 $ 353
Income Tax Expense (Benefit) (88)   (55)   (136) (94)
Net income 174 $ 131 147 $ 113 305 260
Reclassification out of Accumulated Other Comprehensive Income | Defined benefit plans            
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]            
Actuarial losses 24   24   49 48
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement 31       31  
Prior service credit (9)   (13)   (18) (25)
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment 0       (14)  
Income before income taxes 46   11   48 23
Income Tax Expense (Benefit) (7)   0   (8) (1)
Net income $ 39   $ 11   $ 40 $ 22