FINANCIAL INSTRUMENTS Financial Instruments Recorded at Carrying Amount (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt	$ 2,349	$ 2,252
Project Debt	174	383
Project Debt, Held for Sale	510
Accounts Receivable, Net, Noncurrent	1	1
Reported Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Accounts Receivable, Fair Value Disclosure	342	333
Long-term Debt	2,349	2,252
Project Debt	174	383
Project Debt, Held for Sale	510	0
Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Accounts Receivable, Fair Value Disclosure	342	333
Long-term Debt	2,371	2,237
Project Debt	179	387
Project Debt, Held for Sale	$ 510	$ 0