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Financial Instruments, Derivatives, Guarantees and Concentration of Credit Risk (Details 3) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Pre-tax gains and losses for energy commodity derivatives designated as cash flow hedges, as recognized in accumulated other comprehensive income (loss) (AOCI), revenues or costs and operating expenses
Net gain (loss) recognized in other comprehensive income (loss) (effective portion)	$ (18)	$ (12)
Net gain (loss) reclassified from accumulated other comprehensive income (loss) into income (effective portion)	(18)	(13)
Gain (loss) recognized in income (ineffective portion)	$ 0	$ 0

The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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- Definition

The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

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- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

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