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Income Taxes Schedule of Components of Income Tax Expense (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current:
Federal	$ 20us-gaap_CurrentFederalTaxExpenseBenefit	$ 10us-gaap_CurrentFederalTaxExpenseBenefit	$ 16us-gaap_CurrentFederalTaxExpenseBenefit
State and local	2	0	1
Current Income Tax Expense (Benefit)	22us-gaap_CurrentIncomeTaxExpenseBenefit	10us-gaap_CurrentIncomeTaxExpenseBenefit	17us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:
Federal	26	4	30
State and local	13	7	17
deferred income tax expense	39por_DeferredIncomeTaxExpenseFootnote	11por_DeferredIncomeTaxExpenseFootnote	47por_DeferredIncomeTaxExpenseFootnote
Income tax expense	$ 61us-gaap_IncomeTaxExpenseBenefit	$ 21us-gaap_IncomeTaxExpenseBenefit	$ 64us-gaap_IncomeTaxExpenseBenefit

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations.