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Pension and Other Postretirement Benefits Amounts reclassified from accumulated other comprehensive income (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]    
Income before income taxes $ 151 $ 178
Income Tax Expense (Benefit) (38) (48)
Net income 114 131
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 25
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement 37  
Prior service credit (6) (9)
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment 0 (14)
Income before income taxes 55 2
Income Tax Expense (Benefit) (4) (1)
Net income $ 51 $ 1