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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, 2016
USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Amortization of prior service credit (in years) 28 years
United States Pension Benefits  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Actuarial loss $ 50
Prior service (credit) (3)
Total 47
Foreign Pension Benefits  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Actuarial loss 7
Prior service (credit) 0
Total 7
Other Postretirement Benefits  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Actuarial loss 0
Prior service (credit) (15)
Total $ (15)