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Pensions and Other Postretirement Benefits (Net Periodic Benefit Costs) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Pension        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Service Cost $ 3 $ 6 $ 8 $ 18
Defined Benefit Plan, Interest Cost 17 22 49 65
Defined Benefit Plan, Expected Return (Loss) on Plan Assets 38 36 114 108
Amortization of actuarial losses 10 17 30 53
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment 0 0 0 (1)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total (8) 9 (27) 29
Other Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Service Cost 3 2 9 7
Defined Benefit Plan, Interest Cost 3 5 10 15
Amortization of actuarial losses 5 4 15 12
Amortization of prior service credit 14 14 41 44
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total $ (3) $ (3) $ (7) $ (10)