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Related Party Transactions (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Related Party Transaction [Line Items] |  |  |  |  |  |
Due from related parties | $ 527 |  | $ 527 |  |  | $ 68
Funding of debt payment |  |  | 1,001 | $ 74 | [1] |
Revenue from related parties (less than for the three months ended June 30, 2018) | 2 | $ 1 | 5 | 3 |  |
Transportation and Fuel Management Agreement [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Revenue from related parties (less than for the three months ended June 30, 2018) | 2 | 1 | 5 | 2 |  |
NextEra Energy, Inc. [Member] | Management Services Agreement [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Expenses from transactions with related party | 24 | 20 | 68 | 57 |  |
NEER [Member] | Cash Sweep and Credit Support Agreement [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Interest expense | 1 | $ 1 | 4 | $ 3 |  |
Due from related parties | 525 |  | $ 525 |  |  | $ 66
NEP OpCo [Member] | NextEra Energy, Inc. [Member] | Management Services Agreement [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Management fee, percent of EBITDA |  |  | 1.00% |  |  |
Annual management fee |  |  | $ 4 |  |  |
NEER [Member] | Guarantees [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party obligations | 69 |  | 69 |  |  |
NextEra Energy Capital Holdings [Member] | Guarantees and Letters of Credit [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Total amount of letters of credit | $ 682 |  | 682 |  |  |
NextEra Energy Capital Holdings [Member] | Genesis Solar Funding, LLC [Member] | Genesis Solar Funding, LLC [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Funding of debt payment |  |  | $ 31 |  |  |
[1] | Prior-period financial information has been retrospectively adjusted to include the adoption of an accounting standards update related to leases.

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