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Accumulated Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Mar. 31, 2018
Equity [Abstract] |
Schedule of accumulated other comprehensive income (loss) |
| Accumulated Other Comprehensive Income (Loss)
| Net Unrealized Gains on Cash Flow Hedges |  | Net Unrealized Losses on Foreign Currency Translation |  | Other Comprehensive Income (Loss) Related to Equity Method Investee |  | Total
| (millions)
Three months ended March 31, 2018 |  |  |  |  |  |  |
Balances, December 31, 2017 | $ | 1 |  |  | $ | (98 | ) |  | $ | (30 | ) |  | $ | (127 | )
Amounts reclassified from AOCI to interest expense | 1 |  |  | — |  |  | — |  |  | 1 |
Net unrealized losses on foreign currency translation | — |  |  | (4 | ) |  | — |  |  | (4 | )
Other comprehensive income related to equity method investee | — |  |  | — |  |  | 4 |  |  | 4 |
Net other comprehensive income (loss) | 1 |  |  | (4 | ) |  | 4 |  |  | 1 |
Balances, March 31, 2018 | $ | 2 |  |  | $ | (102 | ) |  | $ | (26 | ) |  | $ | (126 | )
AOCI attributable to noncontrolling interest | $ | — |  |  | $ | (99 | ) |  | $ | (28 | ) |  | $ | (127 | )
AOCI attributable to NEP | $ | 2 |  |  | $ | (3 | ) |  | $ | 2 |  |  | $ | 1 |
| Accumulated Other Comprehensive Income (Loss)
| Net Unrealized Gains (Losses) on Cash Flow Hedges |  | Net Unrealized Losses on Foreign Currency Translation |  | Other Comprehensive Income (Loss) Related to Equity Method Investee |  | Total
| (millions)
Three months ended March 31, 2017 |  |  |  |  |  |  |
Balances, December 31, 2016 | $ | (4 | ) |  | $ | (105 | ) |  | $ | (35 | ) |  | $ | (144 | )
Amounts reclassified from AOCI to interest expense | 2 |  |  | — |  |  | — |  |  | 2 |
Other comprehensive income related to equity method investee | — |  |  | — |  |  | 1 |  |  | 1 |
Net other comprehensive income | 2 |  |  | — |  |  | 1 |  |  | 3 |
Balances, March 31, 2017 | $ | (2 | ) |  | $ | (105 | ) |  | $ | (34 | ) |  | $ | (141 | )
AOCI attributable to noncontrolling interest | $ | (3 | ) |  | $ | (101 | ) |  | $ | (35 | ) |  | $ | (139 | )
AOCI attributable to NEP | $ | 1 |  |  | $ | (4 | ) |  | $ | 1 |  |  | $ | (2 | )

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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