Related Party Transactions Related Party Transactions (Details) (Berkshire Hathaway Energy [Member], USD $) In Millions, unless otherwise specified	6 Months Ended
Jun. 30, 2014	Jun. 30, 2013
Berkshire Hathaway Energy [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Cash Paid for Income Taxes, Net	$ 27	$ 66

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