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Retirement Plans (Narrative) (Details) - USD ($)
$ in Millions
9 Months Ended 10 Months Ended
Oct. 15, 2016
Sep. 30, 2016
Sep. 30, 2015
Oct. 31, 2016
Dec. 31, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Capitalization of pension and OPEB expense related to engineering and plant construction   $ 18 $ 15    
Contribution of Property   15      
Additional contributions to pension plan   25   $ 28  
Defined benefit plan, cash contributions by employer $ 3 10      
Plan assets   2,858     $ 1,572
Defined Benefit Plan, Fair Value of Plan Assets, Period Increase (Decrease)   $ 1,286      
Percentage of increase in pension plan   82.00%      
Positive investment returns   $ 235      
Benefit payments   101      
Verizon Transaction [Member]          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Plan assets related to acquisition   $ 1,127