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Benefit Plans (Estimated Net Loss and Prior Service Cost (Credit) Expected to be Amortized in 2016) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
Postretirement Benefit Plan [Member]  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Estimated future net loss $ 30
Estimate future prior service cost (credit) (40)
Pension [Member]  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Estimated future net loss 183
Estimate future prior service cost (credit) $ 5