Debt - Subsidiary Non-recourse Debt in Default or Accelerated (Details) $ in Millions	Sep. 30, 2016 USD ($)
Nonrecourse Debt Default [Line Items]
Materiality threshold for cash distribution from business to Parent	20.00%
Debt Default Amount	$ 134
Kavarna [Member]
Nonrecourse Debt Default [Line Items]
Net Assets	(50)
Sogrinsk [Domain]
Nonrecourse Debt Default [Line Items]
Net Assets	6
Covenant Violation [Member] | Kavarna [Member]
Nonrecourse Debt Default [Line Items]
Debt Default, Short-term Debt, Amount	129
Covenant Violation [Member] | Sogrinsk [Domain]
Nonrecourse Debt Default [Line Items]
Debt Default, Short-term Debt, Amount	$ 5