INVESTMENTS IN UNCONSOLIDATED ENTITIES (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended	3 Months Ended	6 Months Ended		12 Months Ended
	Apr. 15, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Investment In Joint Venture Disclosure [Abstract]
Distributable 2010 income of RBS Sempra Commodities LLP					$ 357
Due to RBS	(28)
Distributions from RBS Sempra Commodities LLP	329
Investment in RBS Sempra Commodities LLP			439		787	[1]
Pretax equity earnings (losses) from RBS Sempra Commodities LLP		$ (16)	$ (8)	$ (9)
Parent Company Member
Joint Venture Sales Of Businesses [Line Items]
Equity Method Investment Distribution Percentage			49.00%
Rbs Member
Joint Venture Sales Of Businesses [Line Items]
Equity Method Investment Distribution Percentage			51.00%

[1] Derived from audited financial statements.