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Summary of Significant Accounting and Reporting Policies (Tables) | 9 Months Ended
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Sep. 30, 2019
Non-controlling Interests [Member] |
Noncontrolling Interest [Line Items] |
Schedule of Noncontrolling Interest | Details of the activity in noncontrolling interests are below:
|  | Class B Noncontrolling Ownership Interests |  | Differential Membership Interests |  | Noncontrolling Ownership Interests in NEP OpCo, Silver State and Texas pipeline |  | Total Noncontrolling Interests
Nine months ended September 30, 2019 |  | (millions)
Balances, December 31, 2018 |  | $ | 751 |  |  | $ | 2,019 |  |  | $ | 422 |  |  | $ | 3,192 |
Net income (loss) attributable to NCI |  | 12 |  |  | (60 | ) |  | (57 | ) |  | (105 | )
Other comprehensive loss |  | — |  |  | — |  |  | (3 | ) |  | (3 | )
Related party contributions |  | — |  |  | — |  |  | 1 |  |  | 1 |
Related party distributions |  | — |  |  | — |  |  | (51 | ) |  | (51 | )
Changes in non-economic ownership interests |  | — |  |  | — |  |  | (6 | ) |  | (6 | )
Differential membership interests contributions, net of distributions |  | — |  |  | 24 |  |  | — |  |  | 24 |
Payments to Class B noncontrolling interest investors |  | (5 | ) |  | — |  |  | — |  |  | (5 | )
Other |  | — |  |  | — |  |  | 1 |  |  | 1 |
Balances, March 31, 2019 |  | 758 |  |  | 1,983 |  |  | 307 |  | — |  | 3,048 |
Sale of Class B noncontrolling interest - net |  | 893 |  |  | — |  |  | — |  |  | 893 |
Acquisition of subsidiaries with noncontrolling ownership interest |  | — |  |  | — |  |  | 472 |  |  | 472 |
Related party note receivable |  | — |  |  | — |  |  | 1 |  |  | 1 |
Net income (loss) attributable to NCI |  | 25 |  |  | (63 | ) |  | (64 | ) |  | (102 | )
Related party contributions |  | — |  |  | — |  |  | 11 |  |  | 11 |
Related party distributions |  | — |  |  | — |  |  | (56 | ) |  | (56 | )
Differential membership interests contributions, net of distributions |  | — |  |  | (8 | ) |  | — |  |  | (8 | )
Payments to Class B noncontrolling interest investors |  | (3 | ) |  | — |  |  | — |  |  | (3 | )
Balances, June 30, 2019 |  | 1,673 |  |  | 1,912 |  |  | 671 |  | — |  | 4,256 |
Acquisition of subsidiaries with noncontrolling ownership interest |  | — |  |  | — |  |  | (10 | ) |  | (10 | )
Net income (loss) attributable to NCI |  | 34 |  |  | (64 | ) |  | (143 | ) |  | (173 | )
Related party distributions |  | — |  |  | — |  |  | (71 | ) |  | (71 | )
Changes in non-economic ownership interests |  | — |  |  | — |  |  | (6 | ) |  | (6 | )
Differential membership interests contributions, net of distributions |  | — |  |  | 27 |  |  | — |  |  | 27 |
Payments to Class B noncontrolling interest investors |  | (7 | ) |  | — |  |  | — |  |  | (7 | )
Balances, September 30, 2019 |  | $ | 1,700 |  |  | $ | 1,875 |  |  | $ | 441 |  |  | $ | 4,016 |
|  | Differential Membership Interests |  | Noncontrolling Ownership Interests in NEP OpCo and Texas pipeline |  | Total Noncontrolling Interests
Nine months ended September 30, 2018 |  | (millions)
Balances, December 31, 2017 |  | $ | — |  |  | $ | 34 |  |  | $ | 34 |
Related party note receivable |  | — |  |  | 29 |  |  | 29 |
Net income (loss) attributable to NCI |  | (269 | ) |  | 170 |  |  | (99 | )
Other comprehensive income |  | — |  |  | 1 |  |  | 1 |
Related party distributions |  | — |  |  | (64 | ) |  | (64 | )
Changes in non-economic ownership interests |  | — |  |  | (6 | ) |  | (6 | )
Differential membership interests contributions, net of distributions |  | 23 |  |  | — |  |  | 23 |
Adoption of accounting standards update |  | 1,413 |  |  | 1 |  |  | 1,414 |
Balances, March 31, 2018 |  | 1,167 |  |  | 165 |  | — |  | 1,332 |
Related party note receivable |  | — |  |  | 2 |  |  | 2 |
Net income (loss) attributable to NCI |  | (39 | ) |  | 243 |  |  | 204 |
Other comprehensive loss |  | — |  |  | (4 | ) |  | (4 | )
Related party distributions |  | — |  |  | (41 | ) |  | (41 | )
Changes in non-economic ownership interests |  | — |  |  | 1 |  |  | 1 |
Differential membership interests contributions, net of distributions |  | (6 | ) |  | — |  |  | (6 | )
Disposal of Canadian Holdings |  | — |  |  | 105 |  |  | 105 |
Adoption of accounting standards update |  | — |  |  | 2 |  |  | 2 |
Balances, June 30, 2018 |  | 1,122 |  |  | 473 |  | — |  | 1,595 |
Net income (loss) attributable to NCI |  | (28 | ) |  | 99 |  |  | 71 |
Other comprehensive income |  | — |  |  | 15 |  |  | 15 |
Related party contributions |  | — |  |  | 1 |  |  | 1 |
Related party distributions |  | — |  |  | (48 | ) |  | (48 | )
Changes in non-economic ownership interests |  | — |  |  | (1 | ) |  | (1 | )
Differential membership interests contributions, net of distributions |  | 23 |  |  | — |  |  | 23 |
Balances, September 30, 2018 |  | $ | 1,117 |  |  | $ | 539 |  |  | $ | 1,656 |

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