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Supplemental Cash Flow Disclosures (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Supplemental Cash Flow Elements [Abstract]      
Interest paid, net of amounts capitalized $ 194us-gaap_InterestPaidNet $ 209us-gaap_InterestPaidNet $ 208us-gaap_InterestPaidNet
Supplemental disclosure of non-cash investing and financing transactions:      
Accruals related to property, plant and equipment additions 30us-gaap_CapitalExpendituresIncurredButNotYetPaid 25us-gaap_CapitalExpendituresIncurredButNotYetPaid 150us-gaap_CapitalExpendituresIncurredButNotYetPaid
ON Line transmission use financial lease obligation $ 7npc_CapitalandFinancialLeaseObligationsIncurred $ 419npc_CapitalandFinancialLeaseObligationsIncurred $ 0npc_CapitalandFinancialLeaseObligationsIncurred