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Summary of Significant Accounting and Reporting Policies
 9 Months Ended
Sep. 30, 2020
Accounting Policies [Abstract]  
Summary of Significant Accounting and Reporting Policies . Summary of Significant Accounting and Reporting Policies
Restricted Cash - At September 30, 2020 and December 31, 2019, NEP had approximately $3 million and $3 million, respectively, of restricted cash included in other current assets on NEP's condensed consolidated balance sheets. Restricted cash at September 30, 2020 and December 31, 2019 is primarily related to collateral deposits from a counterparty. Restricted cash reported as current assets are recorded as such based on the anticipated use of these funds.

Reference Rate Reform - In March 2020, the Financial Accounting Standards Board (FASB) issued an accounting standards update which provides certain options to apply GAAP guidance on contract modifications and hedge accounting as companies transition from the London Inter-Bank Offered Rate (LIBOR) and other interbank offered rates to alternative reference rates that are yet to be determined or finalized. NEP’s contracts that reference LIBOR or other interbank offered rates mainly relate to debt and derivative instruments. The standards update was effective upon issuance and can be applied prospectively through December 31, 2022. NEP is currently evaluating whether to apply the options provided by the standards update with regard to its contracts that reference LIBOR or other interbank offered rates as an interest rate benchmark.
Noncontrolling Interests - At September 30, 2020, the Class B noncontrolling ownership interests (the Class B noncontrolling ownership interests in NEP Renewables sold in 2018 and NEP Renewables II, NEP Pipelines and STX Midstream sold in 2019), the differential membership interests, NEE's approximately 58.2% noncontrolling limited partner interest in NEP OpCo and NEER's approximately 50% noncontrolling ownership interest in Silver State, as well as a non-affiliated party's 10% interest in one of the Texas pipelines and the non-economic ownership interests are reflected as noncontrolling interests on the condensed consolidated balance sheets. The impact of the net income (loss) attributable to the differential membership interests and the Class B noncontrolling ownership interests are allocated to NEE's noncontrolling ownership interest and the net income attributable to NEP based on the respective ownership percentage of NEP OpCo. Details of the activity in noncontrolling interests are below:
 Class B Noncontrolling Ownership Interests
Differential Membership InterestsNEER's Noncontrolling Ownership Interests in NEP OpCo and Silver StateOther Noncontrolling Ownership InterestsTotal Noncontrolling
Interests
Nine months ended September 30, 2020(millions)
Balances, December 31, 2019$2,628 $1,798 $389 $68 $4,883 
Net income (loss) attributable to NCI52 (71)(459)(22)(500)
Related party contributions— — — 3 3 
Related party distributions— — (60)(2)(62)
Differential membership investment contributions, net of distributions
— 40 — — 40 
Payments to Class B noncontrolling interest investors
(10)— — — (10)
Balances, March 31, 20202,670 1,767 (130)47 4,354 
Related party note receivable— — 1 — 1 
Net income (loss) attributable to NCI53 (78)97 6 78 
Other comprehensive income— — 1 — 1 
Related party contributions— — — 2 2 
Related party distributions— — (67)(2)(69)
Differential membership investment contributions, net of distributions
— (8)— — (8)
Payments to Class B noncontrolling interest investors
(11)— — — (11)
Other— — 1 — 1 
Balances, June 30, 20202,712 1,681 (97)53 4,349 
Net income (loss) attributable to NCI55 (56)126 13 138 
Related party contributions— — — 1 1 
Related party distributions— — (79)(2)(81)
Changes in non-economic ownership interests— — — (7)(7)
Differential membership investment contributions, net of distributions— 39 — — 39 
Payments to Class B noncontrolling interest investors
(13)— — — (13)
Other— (1)— — (1)
Balances, September 30, 2020$2,754 $1,663 $(50)$58 $4,425 
 Class B Noncontrolling Ownership InterestsDifferential Membership InterestsNEER's Noncontrolling Ownership Interests in NEP OpCo and Silver StateOther Noncontrolling Ownership InterestsTotal Noncontrolling
Interests
Nine months ended September 30, 2019(millions)
Balances, December 31, 2018$751 $2,019 $342 $80 $3,192 
Net income (loss) attributable to NCI12 (60)(50)(7)(105)
Other comprehensive loss— — (3)— (3)
Related party contributions— — 1 — 1 
Related party distributions— — (50)(1)(51)
Changes in non-economic ownership interests
— — — (6)(6)
Differential membership investment contributions, net of distributions
— 24 — — 24 
Payments to Class B noncontrolling interest investors(5)— — — (5)
Other— — 1 — 1 
Balances, March 31, 2019758 1,983 241 66 3,048 
Sale of noncontrolling interest in a NEP OpCo subsidiary893 — — — 893 
Acquisition of subsidiary with noncontrolling ownership interests— — 472 — 472 
Related party note receivable— — 1 — 1 
Net income (loss) attributable to NCI25 (63)(59)(5)(102)
Related party contributions— — 11 — 11 
Related party distributions— — (54)(2)(56)
Differential membership investment contributions, net of distributions
— (8)— — (8)
Payments to Class B noncontrolling interest investors(3)— — — (3)
Balances, June 30, 20191,673 1,912 612 59 4,256 
Acquisition of subsidiary with noncontrolling ownership interests— — (10)— (10)
Net income (loss) attributable to NCI34 (64)(143)— (173)
Related party distributions— — (69)(2)(71)
Changes in non-economic ownership interests— — — (6)(6)
Differential membership investment contributions, net of distributions— 27 — — 27 
Payments to Class B noncontrolling interest investors(7)— — — (7)
Balances, September 30, 2019$1,700 $1,875 $390 $51 $4,016