Oncor-Related Transactions	9 Months Ended
Sep. 30, 2017
Business Combinations [Abstract]
Oncor-Related Transactions	Oncor-Related Transactions From July 2016 through October 2016, NEE and certain of its affiliates entered into several agreements with Energy Future Holdings Corp. (EFH) and Energy Future Intermediate Holding Company LLC (EFIH), Texas Transmission Holdings Corporation (TTHC), Oncor Management Investment LLC and certain of their affiliates, which would have resulted in NEE owning 100% of Oncor Electric Delivery Company LLC (Oncor) if the transactions contemplated by those agreements would have been consummated. The agreements with EFH and EFIH and TTHC were subject to, among other things, approval by the Public Utility Commission of Texas (PUCT). On April 13, 2017, the PUCT issued a final order denying NEE's purchase of Oncor. On July 6, 2017, EFH and EFIH provided a written notice (notice) to NEE terminating the agreement and plan of merger, dated as of July 29, 2016, as amended (merger agreement), under which EFH Merger Co., LLC (Merger Sub), a direct wholly owned subsidiary of NEE, would have acquired 100% of the equity of reorganized EFH and certain of its subsidiaries, including its indirect ownership of approximately 80% of the outstanding equity interests of Oncor. Subsequently, NEE, EFH and EFIH and a large creditor of EFIH commenced legal proceedings in the U.S. Bankruptcy Court for the District of Delaware (bankruptcy court) in which the chapter 11 bankruptcy proceedings of EFH and EFIH are taking place to determine whether NEE is entitled to receive the $275 million termination fee to which NEE believes it is entitled under the merger agreement and a September 2016 order of the bankruptcy court approving the termination fee payment provisions of the merger agreement (2016 termination fee approval order). In October 2017, the judge presiding over these proceedings issued an opinion and order in one of these legal proceedings that the bankruptcy court's issuance of the 2016 termination fee approval order was based upon a fundamental misapprehension of critical facts by the bankruptcy court and, accordingly, ordered that EFH and EFIH are not authorized to pay the fee. NEE intends to appeal this decision and believes it is erroneous. Until that appeal is ultimately resolved, the remaining legal proceedings in the bankruptcy court between NEE, EFH and EFIH and the large creditor of EFIH as to whether NEE would be entitled to the termination fee if the foregoing appeal is successful have been stayed. NEE is continuing to perform its obligations under the TTHC merger agreement. The TTHC merger agreement becomes terminable by NEE and separately by TTHC and its primary owners (acting together) if the PUCT has not approved the TTHC transaction by October 31, 2017. The TTHC merger agreement contemplates the payment by NEE of a termination fee of $72.3 million in connection with certain specified terminations of the TTHC merger agreement.

Oncor-Related Transactions

From July 2016 through October 2016, NEE and certain of its affiliates entered into several agreements with Energy Future Holdings Corp. (EFH) and Energy Future Intermediate Holding Company LLC (EFIH), Texas Transmission Holdings Corporation (TTHC), Oncor Management Investment LLC and certain of their affiliates, which would have resulted in NEE owning 100% of Oncor Electric Delivery Company LLC (Oncor) if the transactions contemplated by those agreements would have been consummated. The agreements with EFH and EFIH and TTHC were subject to, among other things, approval by the Public Utility Commission of Texas (PUCT). On April 13, 2017, the PUCT issued a final order denying NEE's purchase of Oncor. On July 6, 2017, EFH and EFIH provided a written notice (notice) to NEE terminating the agreement and plan of merger, dated as of July 29, 2016, as amended (merger agreement), under which EFH Merger Co., LLC (Merger Sub), a direct wholly owned subsidiary of NEE, would have acquired 100% of the equity of reorganized EFH and certain of its subsidiaries, including its indirect ownership of approximately 80% of the outstanding equity interests of Oncor. Subsequently, NEE, EFH and EFIH and a large creditor of EFIH commenced legal proceedings in the U.S. Bankruptcy Court for the District of Delaware (bankruptcy court) in which the chapter 11 bankruptcy proceedings of EFH and EFIH are taking place to determine whether NEE is entitled to receive the $275 million termination fee to which NEE believes it is entitled under the merger agreement and a September 2016 order of the bankruptcy court approving the termination fee payment provisions of the merger agreement (2016 termination fee approval order). In October 2017, the judge presiding over these proceedings issued an opinion and order in one of these legal proceedings that the bankruptcy court's issuance of the 2016 termination fee approval order was based upon a fundamental misapprehension of critical facts by the bankruptcy court and, accordingly, ordered that EFH and EFIH are not authorized to pay the fee. NEE intends to appeal this decision and believes it is erroneous. Until that appeal is ultimately resolved, the remaining legal proceedings in the bankruptcy court between NEE, EFH and EFIH and the large creditor of EFIH as to whether NEE would be entitled to the termination fee if the foregoing appeal is successful have been stayed.

NEE is continuing to perform its obligations under the TTHC merger agreement. The TTHC merger agreement becomes terminable by NEE and separately by TTHC and its primary owners (acting together) if the PUCT has not approved the TTHC transaction by October 31, 2017. The TTHC merger agreement contemplates the payment by NEE of a termination fee of $72.3 million in connection with certain specified terminations of the TTHC merger agreement.