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Debt and Other Obligations Lease/Leaseback Obligations (Details)
$ in Millions
 12 Months Ended
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2003
Units
Debt Disclosure [Abstract]      
Leasing transaction, number of units | Units     24
Percentage equity interests acquired 100.00%    
Number of Businesses Acquired 2    
Number of combustion units - Leaseback obligation 8    
CT and QTE outstanding leaseback obligation | $ $ 467 $ 466