DEBT (Details - Credit facilities) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($)
Schedule of Debt Instruments [Line Items]
Letter of credit outstanding	$ 140
Contingent liquidity facility	$ 500
5-Year Syndicated Facility
Schedule of Debt Instruments [Line Items]
Line of credit facilities, term of credit agreements	5 years
Maximum borrowing capacity	$ 4,500
Remaining borrowing capacity	4,500
Increased commitment to Five-Year Facility	$ 500
Debt Instrument, Maturity Date	November 2020
Debt Instrument Effective Date	Nov. 05, 2015