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Pension and Other Postretirement Benefit Plans (Estimated Pre-Tax Amounts That Will Be Amortized from Accumulated OCI) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Amortization of actuarial losses 21 years
Amortization of prior service credit (in years) 13 years
Other Postretirement Benefits  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Actuarial loss $ 1
Prior service (credit) (8)
Total (7)
United States Pension Benefits | Pension Benefits  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Actuarial loss 62
Prior service (credit) 0
Total 62
Foreign Pension Benefits | Pension Benefits  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Actuarial loss 12
Prior service (credit) 0
Total $ 12