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Postretirement Benefit Plans (Details Textual) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block        
Other Postretirement Benefit Expense $ 1 $ 1 $ 3 $ 4
Amortization of net actuarial loss (less than $1 million for the three and six months ended September 30, 2015) $ (1) (1) (1) (1)
Employer contribution to defined benefit plan     21 $ 30
Defined Benefit Plan, Plan Amendments   10    
Defined Benefit Plan, Effect of Plan Amendment on Actuarial Losses, before Tax   3    
Defined Benefit Plan, Effect of Plan Amendment on Actuarial Losses, net of Tax   1    
Defined Benefit Plan, Effect of Plan Amendment on Prior Service Credit, before Tax   13    
Defined Benefit Plan, Effect of Plan Amendment on Prior Service Credit, net of Tax   $ 8    
Minimum        
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block        
Additional contributions     6  
Maximum        
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block        
Additional contributions     $ 10