ASSETS HELD FOR SALE (Details) - Termoelectrica de Mexicali [Member] $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($)
Assets Held for Sale, Assets [Abstract]
Assets Held for Sale, Cash and Cash Equivalent	$ 1
Assets Held for Sale, Inventories	8
Assets Held for Sale, Other Current Assets	29
Assets Held for Sale, Other Assets	15
Assets Held for Sale, Property, Plant and Equipment, Net	250
Total Assets Held for Sale	303
Assets Held for Sale, Liabilities [Abstract]
Assets Held for Sale, Accounts Payable	1
Assets Held for Sale, Other Current Liabilities	7
Assets Held for Sale, Deferred Income Taxes	16
Assets Held for Sale, Asset Retirement Obligations	4
Assets Held for Sale, Other Liabilities	15
Total Liabilities Held for Sale	43
Disposal Group Including Discontinued Operation Additional Disclosures [Abstract]
Deferred Tax Expense From The Outside Basis Difference	29
Deferred Tax Expense From The Outside Basis Difference After NoncontrollingInterest	$ 24