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Accumulated Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Sep. 30, 2019
Equity [Abstract] |
Schedule of 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 Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 + Details
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