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Accumulated Other Comprehensive Income (Loss) | 9 Months Ended
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Sep. 30, 2019
Equity [Abstract] |
Accumulated Other Comprehensive (Income) Loss | Accumulated Other Comprehensive Income (Loss)
| Accumulated Other Comprehensive Income (Loss)
| Net Unrealized Gains on Cash Flow Hedges |  | Other Comprehensive Income (Loss) Related to Equity Method Investees |  | Total
| (millions)
Balances, December 31, 2018 | $ | 6 |  |  | $ | (24 | ) |  | $ | (18 | )
Amounts reclassified from AOCI to interest expense | (6 | ) |  | — |  |  | (6 | )
Other comprehensive income related to equity method investees | — |  |  | 1 |  |  | 1 |
Net other comprehensive income (loss) | (6 | ) |  | 1 |  |  | (5 | )
Balances, March 31, 2019 | — |  |  | (23 | ) |  | (23 | )
Net other comprehensive income (loss) | — |  |  | — |  |  | — |
Balances, June 30, 2019 | — |  |  | (23 | ) |  | (23 | )
Net other comprehensive income (loss) | — |  |  | — |  |  | — |
Balances, September 30, 2019 | $ | — |  |  | $ | (23 | ) |  | $ | (23 | )
AOCI attributable to noncontrolling interest | $ | — |  |  | $ | (15 | ) |  | $ | (15 | )
AOCI attributable to NEP | $ | — |  |  | $ | (8 | ) |  | $ | (8 | )
| 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)
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 | )
Amounts reclassified from AOCI to interest expense | 1 |  |  | — |  |  | — |  |  | 1 |
Net unrealized losses on foreign currency translation | — |  |  | (2 | ) |  | — |  |  | (2 | )
Other comprehensive income related to equity method investee | — |  |  | — |  |  | (4 | ) |  | (4 | )
Net other comprehensive income (loss) | 1 |  |  | (2 | ) |  | (4 | ) |  | (5 | )
Impact of disposal of Canadian Holdings | 3 |  |  | 104 |  |  | — |  |  | 107 |
Balances, June 30, 2018 | 6 |  |  | — |  |  | (30 | ) |  | (24 | )
Amounts reclassified from AOCI to interest expense | (1 | ) |  | — |  |  | — |  |  | (1 | )
Other comprehensive income related to equity method investee | — |  |  | — |  |  | 9 |  |  | 9 |
Net other comprehensive income (loss) | (1 | ) |  | — |  |  | 9 |  |  | 8 |
Balances, September 30, 2018 | $ | 5 |  |  | $ | — |  |  | $ | (21 | ) |  | $ | (16 | )
AOCI attributable to noncontrolling interest | $ | 4 |  |  | $ | — |  |  | $ | (15 | ) |  | $ | (11 | )
AOCI attributable to NEP | $ | 1 |  |  | $ | — |  |  | $ | (6 | ) |  | $ | (5 | )

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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_EquityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration