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Derivative Instruments and Hedging Activity | 9 Months Ended
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Sep. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Derivative Instruments and Hedging Activity | Derivative Instruments and Hedging Activity NEP uses derivative instruments (primarily interest rate swaps) to manage the interest rate cash flow risk associated primarily with expected future debt issuances and borrowings. NEP records all derivative instruments that are required to be marked to market as either assets or liabilities on its condensed consolidated balance sheets and measures them at fair value each reporting period. NEP does not utilize hedge accounting for its derivative instruments. All changes in the derivatives' fair value are recognized in interest expense in the condensed consolidated statements of income (loss). At September 30, 2019 and December 31, 2018, the net notional amounts of the interest rate contracts were approximately $6,839 million and $7,056 million, respectively. During the nine months ended September 30, 2019, NEP reclassified approximately $6 million from AOCI to interest expense primarily because the related future transactions being hedged were no longer going to occur. At September 30, 2019, NEP's AOCI does not include any amounts related to discontinued cash flow hedges. Cash flows from the interest rate swap contracts are reported in cash flows from operating activities in the condensed consolidated statements of cash flows. Prior to the sale of Canadian Holdings in June 2018, NEP entered into certain foreign currency exchange contracts to economically hedge its cash flows from foreign currency rate fluctuations. During the three and nine months ended September 30, 2018, NEP recorded less than $1 million of losses and approximately $13 million of gains, respectively, related to the foreign currency contracts in other - net in the condensed consolidated statements of income (loss). Fair Value of Derivative Instruments - The tables below present NEP's gross derivative positions, based on the total fair value of each derivative instrument, at September 30, 2019 and December 31, 2018, 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.
| September 30, 2019
| Gross Basis |  | Net Basis
| Assets |  | Liabilities |  | Assets |  | Liabilities
| (millions)
Interest rate contracts | $ | 13 |  |  | $ | 698 |  |  | $ | — |  |  | $ | 685 |
Net fair value by balance sheet line item: |  |  |  |  |  |  |
Other current assets |  |  |  |  | $ | — |  |  |
Other non-current assets |  |  |  |  | — |  |  |
Other current liabilities |  |  |  |  |  |  | $ | 6 |
Derivatives |  |  |  |  |  |  | 679 |
Total derivatives |  |  |  |  | $ | — |  |  | $ | 685 |
| December 31, 2018
| Gross Basis |  | Net Basis
| Assets |  | Liabilities |  | Assets |  | Liabilities
| (millions)
Interest rate contracts | $ | 24 |  |  | $ | 116 |  |  | $ | 13 |  |  | $ | 105 |
Net fair value by balance sheet line item: |  |  |  |  |  |  |
Other current assets |  |  |  |  | $ | 7 |  |  |
Other non-current assets |  |  |  |  | 6 |  |  |
Other current liabilities |  |  |  |  |  |  | $ | 1 |
Derivatives |  |  |  |  |  |  | 104 |
Total derivatives |  |  |  |  | $ | 13 |  |  | $ | 105 |
Financial Statement Impact of Derivative Instruments - Gains (losses) related to NEP's interest rate contracts are recorded in the condensed consolidated financial statements as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
| (millions)
Interest rate contracts: |
Gains (losses) reclassified from AOCI to interest expense | $ | — |  |  | $ | — |  |  | $ | 5 |  |  | $ | (3 | )
Gains (losses) recognized in interest expense | $ | (311 | ) |  | $ | 74 |  |  | $ | (589 | ) |  | $ | 55 |
Credit-Risk-Related Contingent Features - Certain of NEP's derivative instruments contain credit-related cross-default and material adverse change triggers, none of which contain requirements to maintain certain credit ratings or financial ratios. At September 30, 2019 and December 31, 2018, the aggregate fair value of NEP's derivative instruments with contingent risk features that were in a liability position was approximately $640 million and $108 million, respectively.

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- Definition The entire disclosure for derivative instruments and hedging activities including, but not limited to, risk management strategies, non-hedging derivative instruments, assets, liabilities, revenue and expenses, and methodologies and assumptions used in determining the amounts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -URI http://asc.fasb.org/topic&trid=2229140 + Details
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