Related Party Transactions (Details) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2015	Sep. 30, 2014
Berkshire Hathaway Energy [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Cash (Received) Paid for Income Taxes, Net	$ (35)	$ 100

The amount of cash received during the current period from affiliates for refunds for the overpayment of taxes on income, net of any amounts paid during the current period.

No definition available.

Name:	pcorp_RelatedPartyTransactionCashReceivedForIncomeTaxesNet
Namespace Prefix:	pcorp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration