Restatement (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015	Sep. 30, 2014
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Accounts Receivable Payable, Affiliated Companies, Overstated Amount		$ 120
Net Cash Provided By Operating Activities, Overstated Amount	$ 120
Increase In Notes Payable, Affiliated Companies, Understated Amount		120
Net Cash Used in Financing Activites, Overstated Amount		120
Accounts receivable/payable–affiliated companies		(23)	$ (9)
Net cash provided by operating activities		687
Increase in notes payable–affiliated companies		120	$ (3)
Net cash used in financing activities		(190)
Scenario, Previously Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Accounts receivable/payable–affiliated companies		97
Net cash provided by operating activities		807
Increase in notes payable–affiliated companies		0
Net cash used in financing activities		$ (310)