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Retirement Benefits (Net Periodic Benefit Costs Schedule) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Interest Cost $ 3 $ 25
Defined Benefit Plan, Expected Return on Plan Assets (1) (16)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 0 0
Defined Benefit Plan, Amortization of Gains (Losses) 0 0
Net Periodic Benefit Costs, Settlements 0 32
Defined Benefit Plan, Net Periodic Benefit Cost 2 41
Other Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Interest Cost 4 4
Defined Benefit Plan, Expected Return on Plan Assets (8) (8)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 1 1
Defined Benefit Plan, Amortization of Gains (Losses) 0 0
Net Periodic Benefit Costs, Settlements 0 0
Defined Benefit Plan, Net Periodic Benefit Cost $ (3) $ (3)