OTHER FINANCIAL DATA - U.S. TREASURY GRANTS RECEIVABLE (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended				3 Months Ended
	Mar. 31, 2013	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012		Sep. 30, 2013 Mesquite Solar 1 [Member]	Jun. 30, 2013 Copper Mountain Solar 2 [Member]
U.S. Treasury Grants Receivable [Line Items]
U.S. Treasury grants receivable		$ 0		$ 258	[1]
Proceeds From U.S. Treasury Grants		238	0			164	74
Reduction in tax benefit due to sequestration	5
Sequestration of U.S. Treasury grants receivable		$ 23	$ 0

[1] Derived from audited financial statements.