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Basis of presentation (Details) (USD $) In Millions	9 Months Ended
Basis of presentation (Details) (USD $) In Millions	Sep. 30, 2011
Basis of presentation
Decrease in operating cash flows related to unpaid invoices for electric utility property, plant and equipment	$ 13
Increase in investing cash flows related to unpaid invoices for electric utility property, plant and equipment	$ 13