Other Commitments and Contingencies (Details) (USD $)	12 Months Ended
	Dec. 31, 2009 Synthetic fuels matters	Dec. 31, 2011 Merger matters	Dec. 31, 2011 CVO holder matters	Dec. 31, 2011 Spent nuclear fuel matters
Gain Contingencies [Line Items]
Gain contingency, asserted damage				$ 90,000,000
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