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Derivative Instruments and Hedging Activity (Tables) | 3 Months Ended
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Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of the fair values of derivative instruments designated as cash flow hedging instruments included in balance sheets | The tables below present NEP's gross derivative positions, based on the total fair value of each derivative instrument, at March 31, 2018 and December 31, 2017, as required by disclosure rules, as well as the location of the net derivative positions, based on the expected timing of future payments, on the condensed consolidated balance sheets.
| March 31, 2018
| Gross Basis |  | Net Basis
| Assets |  | Liabilities |  | Assets |  | Liabilities
| (millions)
Interest rate contracts | $ | 44 |  |  | $ | 125 |  |  | $ | 26 |  |  | $ | 107 |
Foreign currency contracts | — |  |  | 1 |  |  | — |  |  | 1 |
Total fair values | $ | 44 |  |  | $ | 126 |  |  | $ | 26 |  |  | $ | 108 |
Net fair value by balance sheet line item: |  |  |  |  |  |  |
Other current assets |  |  |  |  | $ | 10 |  |  |
Assets held for sale |  |  |  |  | 4 |  |  |
Other non-current assets |  |  |  |  | 12 |  |  |
Current derivative liabilities |  |  |  |  |  |  | $ | 4 |
Liabilities associated with assets held for sale |  |  |  |  |  |  | 6 |
Other non-current liabilities |  |  |  |  |  |  | 98 |
Total derivatives |  |  |  |  | $ | 26 |  |  | $ | 108 |
| December 31, 2017
| Gross Basis |  | Net Basis
| Assets |  | Liabilities |  | Assets |  | Liabilities
| (millions)
Interest rate contracts | $ | 15 |  |  | $ | 44 |  |  | $ | 18 |  |  | $ | 47 |
Foreign currency contracts | — |  |  | 3 |  |  | — |  |  | 3 |
Total fair values | $ | 15 |  |  | $ | 47 |  |  | $ | 18 |  |  | $ | 50 |
Net fair value by balance sheet line item: |  |  |  |  |  |  |
Other current assets |  |  |  |  | $ | 10 |  |  |
Other non-current assets |  |  |  |  | 8 |  |  |
Current derivative liabilities |  |  |  |  |  |  | $ | 11 |
Other non-current liabilities |  |  |  |  |  |  | 39 |
Total derivatives |  |  |  |  | $ | 18 |  |  | $ | 50 |
Schedule of gains (losses) related to interest rate contracts | Gains (losses) related to NEP's interest rate contracts are recorded in the condensed consolidated financial statements as follows:
| Three Months Ended March 31,
| 2018 |  | 2017
| (millions)
Interest rate contracts: |
Losses reclassified from AOCI to interest expense | $ | (2 | ) |  | $ | (3 | )
Losses recognized in interest expense | $ | (52 | ) |  | $ | (2 | )

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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 + Details
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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + Details
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