Other Commitments and Contingencies (Details) (USD $)	9 Months Ended	12 Months Ended	9 Months Ended
	Sep. 30, 2011 Spent nuclear fuel matters	Dec. 31, 2009 Synthetic fuels matters	Sep. 30, 2011 Merger matters	Sep. 30, 2011 CVO holder matters
Gain Contingencies [Line Items]
Gain contingency, asserted damage	$ 90,000,000
Gain contingency, unrecorded amount	83,000,000
Former Gain Contingency, Recognized in Current Period	92,000,000
Former Gain Contingency, O&M Offset Recognized in Current Period	27,000,000
Loss Contingencies [Line Items]
Maximum legal fee reimbursement			550,000
Judgment award		78,000,000
Prejudgment interest		55,000,000
Total judgment		133,000,000
After-tax loss contingency, loss in period		74,000,000
Judgment payment		154,000,000
Contingent payment sought amount				$ 42,000,000