Revenue	3 Months Ended
Mar. 31, 2018
Revenue from Contract with Customer [Abstract]
Revenue	Revenue Effective January 1, 2018, NEP adopted an accounting standards update that provides guidance on the recognition of revenue from contracts with customers and requires additional disclosures regarding such contracts (new revenue standard). Under the new revenue standard, revenue is recognized when control of the promised goods or services is transferred to customers at an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods and services. NEP adopted the new revenue standard using the modified retrospective approach applying it only to contracts that were not complete at January 1, 2018. NEP did not recognize a cumulative effect adjustment on January 1, 2018 because revenue recognized under the new accounting standard remained consistent with historical practice. NEP's operating revenues are generated primarily from various non-affiliated parties under long-term power purchase agreements, FIT agreements and RESOP agreements (collectively, PPAs) and natural gas transportation agreements. Revenue is recognized as energy and any related renewable energy attributes are delivered, based on rates stipulated in the respective PPAs, or natural gas transportation services are performed. NEP believes that the obligation to deliver energy and provide the natural gas transportation services is satisfied over time as the customer simultaneously receives and consumes benefits provided by NEP. In addition, NEP believes that the obligation to deliver renewable energy attributes is satisfied at multiple points in time, with the control of the renewable energy attribute being transferred at the same time the related energy is delivered. Substantially all of the PPAs are accounted for as operating leases and are not considered contracts with customers within the scope of the new revenue standard. Included in NEP’s operating revenues for the three months ended March 31, 2018, is approximately $12 million and $55 million of revenue from contracts with customers for renewable energy sales and natural gas transportation services, respectively. At March 31, 2018, NEP's accounts receivable balances related to contracts with customers was approximately $23 million. NEP recognizes revenues as energy and any related renewable energy attributes are delivered or natural gas transportation services are performed, consistent with the amounts billed to customers based on rates stipulated in the respective PPAs. NEP considers the amount billed to represent the value of energy delivered or services provided to the customer. NEP’s customers typically receive bills monthly with payment due within 30 days. The contracts with customers related to pipeline service revenues contain a fixed price related to firm natural gas transportation capacity with maturity dates ranging from 2018 to 2035. At March 31, 2018, NEP expects to record approximately $2.0 billion of revenues over the remaining terms of the related contacts as the capacity is provided. Revenues yet to be earned under contracts with customers to deliver energy and any related energy attributes, which have maturity dates ranging from 2030 to 2035, will vary based on the volume of energy delivered.

Revenue

Effective January 1, 2018, NEP adopted an accounting standards update that provides guidance on the recognition of revenue from contracts with customers and requires additional disclosures regarding such contracts (new revenue standard). Under the new revenue standard, revenue is recognized when control of the promised goods or services is transferred to customers at an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods and services. NEP adopted the new revenue standard using the modified retrospective approach applying it only to contracts that were not complete at January 1, 2018. NEP did not recognize a cumulative effect adjustment on January 1, 2018 because revenue recognized under the new accounting standard remained consistent with historical practice.

NEP's operating revenues are generated primarily from various non-affiliated parties under long-term power purchase agreements, FIT agreements and RESOP agreements (collectively, PPAs) and natural gas transportation agreements. Revenue is recognized as energy and any related renewable energy attributes are delivered, based on rates stipulated in the respective PPAs, or natural gas transportation services are performed. NEP believes that the obligation to deliver energy and provide the natural gas transportation services is satisfied over time as the customer simultaneously receives and consumes benefits provided by NEP. In addition, NEP believes that the obligation to deliver renewable energy attributes is satisfied at multiple points in time, with the control of the renewable energy attribute being transferred at the same time the related energy is delivered. Substantially all of the PPAs are accounted for as operating leases and are not considered contracts with customers within the scope of the new revenue standard. Included in NEP’s operating revenues for the three months ended March 31, 2018, is approximately $12 million and $55 million of revenue from contracts with customers for renewable energy sales and natural gas transportation services, respectively. At March 31, 2018, NEP's accounts receivable balances related to contracts with customers was approximately $23 million.

NEP recognizes revenues as energy and any related renewable energy attributes are delivered or natural gas transportation services are performed, consistent with the amounts billed to customers based on rates stipulated in the respective PPAs. NEP considers the amount billed to represent the value of energy delivered or services provided to the customer. NEP’s customers typically receive bills monthly with payment due within 30 days.

The contracts with customers related to pipeline service revenues contain a fixed price related to firm natural gas transportation capacity with maturity dates ranging from 2018 to 2035. At March 31, 2018, NEP expects to record approximately $2.0 billion of revenues over the remaining terms of the related contacts as the capacity is provided. Revenues yet to be earned under contracts with customers to deliver energy and any related energy attributes, which have maturity dates ranging from 2030 to 2035, will vary based on the volume of energy delivered.