DERIVATIVE FINANCIAL INSTRUMENTS (Details 2) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Derivatives designated as hedging instruments
Derivative [Line Items]
Asset Derivatives Fair Value	$ 2	$ 3	[1]
Liability Derivatives Fair Value	96	172
Derivatives designated as hedging instruments | Interest Rate Contract | Prepayments and other
Derivative [Line Items]
Asset Derivatives Fair Value	0	2
Derivatives designated as hedging instruments | Interest Rate Contract | Other current liabilities
Derivative [Line Items]
Liability Derivatives Fair Value	5	55
Derivatives designated as hedging instruments | Interest Rate Contract | Other deferred credits and other liabilities
Derivative [Line Items]
Liability Derivatives Fair Value	80	103
Derivatives designated as hedging instruments | Commodity contracts | Prepayments and other
Derivative [Line Items]
Asset Derivatives Fair Value	1
Liability Derivatives Fair Value	2	1
Derivatives designated as hedging instruments | Commodity contracts | Other current liabilities
Derivative [Line Items]
Asset Derivatives Fair Value	1	1	[1]
Liability Derivatives Fair Value	7	10
Derivatives designated as hedging instruments | Commodity contracts | Other deferred credits and other liabilities
Derivative [Line Items]
Liability Derivatives Fair Value	2	3
Derivatives not designated as hedging instruments
Derivative [Line Items]
Asset Derivatives Fair Value	31	27
Liability Derivatives Fair Value	30	25
Derivatives not designated as hedging instruments | Other Energy Management Contract [Member] | Prepayments and other
Derivative [Line Items]
Asset Derivatives Fair Value	19	17
Liability Derivatives Fair Value	3	3
Derivatives not designated as hedging instruments | Other Energy Management Contract [Member] | Other deferred debits and other assets
Derivative [Line Items]
Asset Derivatives Fair Value	12	10
Derivatives not designated as hedging instruments | Other Energy Management Contract [Member] | Other current liabilities
Derivative [Line Items]
Liability Derivatives Fair Value	16	13
Derivatives not designated as hedging instruments | Other Energy Management Contract [Member] | Other deferred credits and other liabilities
Derivative [Line Items]
Liability Derivatives Fair Value	$ 11	$ 9

[1] (c) Asset derivatives represent unrealized gains to the Company, and liability derivatives represent unrealized losses. In the Company’s condensed consolidated balance sheets, unrealized gain and loss positions on commodity contracts with the same counterparty are reported as either a net asset or liability, and for purposes of the above disclosure they are reported on a gross basis.