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Equity (Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |
Other comprehensive income (loss) before reclassifications | $ 11 | $ 31 | $ (43) | $ 6 | $ 15 | $ (35) |  |  |
Amounts reclassified from AOCI | 2 | 1 | 4 | 4 | 7 | 11 |  |  |
Total other comprehensive income, net of tax | 13 | 32 | (39) | 10 | 22 | (24) | $ 6 | $ 8 |
Impact of disposal of a business |  |  | 10 |  |  |  |  |  |
Acquisition of Gulf Power |  |  |  |  |  | (1) |  |  |
Attributable to noncontrolling interests | (1) |  |  |  |  |  | (1) |  |
Attributable to NEE | (152) |  |  |  |  |  | (152) |  | $ (169)
Ending balance | (153) |  |  | (181) |  |  | (153) | (181) |
Net Unrealized Gains (Losses) on Cash Flow Hedges |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |
Beginning balance | 1 | (2) | (27) | (38) | (46) | (55) | (27) | (55) |
Other comprehensive income (loss) before reclassifications | 0 | 0 | 0 | 0 | 0 | 0 |  |  |
Amounts reclassified from AOCI | 2 | 3 | 2 | 6 | 8 | 10 |  |  |
Total other comprehensive income, net of tax | 2 | 3 | 2 | 6 | 8 | 10 |  |  |
Impact of disposal of a business |  |  | 23 |  |  |  |  |  |
Acquisition of Gulf Power |  |  |  |  |  | (1) |  |  |
Attributable to noncontrolling interests | 0 |  |  |  |  |  | 0 |  |
Attributable to NEE | 3 |  |  |  |  |  | 3 |  |
Ending balance | 3 | 1 | (2) | (32) | (38) | (46) | 3 | (32) |
Net Unrealized Gains (Losses) on Available for Sale Securities |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |
Beginning balance | 16 | 2 | 11 | 9 | 3 | (7) | 11 | (7) |
Other comprehensive income (loss) before reclassifications | 3 | 14 | (8) | 4 | 7 | 8 |  |  |
Amounts reclassified from AOCI | (1) | 0 | (1) | (1) | (1) | 2 |  |  |
Total other comprehensive income, net of tax | 2 | 14 | (9) | 3 | 6 | 10 |  |  |
Impact of disposal of a business |  |  | 0 |  |  |  |  |  |
Acquisition of Gulf Power |  |  |  |  |  | 0 |  |  |
Attributable to noncontrolling interests | 0 |  |  |  |  |  | 0 |  |
Attributable to NEE | 18 |  |  |  |  |  | 18 |  |
Ending balance | 18 | 16 | 2 | 12 | 9 | 3 | 18 | 12 |
Defined Benefit Pension and Other Benefits Plans |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |
Beginning balance | (113) | (111) | (114) | (119) | (118) | (65) | (114) | (65) |
Other comprehensive income (loss) before reclassifications | 0 | 0 | 0 | 0 | (1) | (52) |  |  |
Amounts reclassified from AOCI | 1 | (2) | 3 | (1) | 0 | (1) |  |  |
Total other comprehensive income, net of tax | 1 | (2) | 3 | (1) | (1) | (53) |  |  |
Impact of disposal of a business |  |  | 0 |  |  |  |  |  |
Acquisition of Gulf Power |  |  |  |  |  | 0 |  |  |
Attributable to noncontrolling interests | 0 |  |  |  |  |  | 0 |  |
Attributable to NEE | (112) |  |  |  |  |  | (112) |  |
Ending balance | (112) | (113) | (111) | (120) | (119) | (118) | (112) | (120) |
Net Unrealized Gains (Losses) on Foreign Currency Translation |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |
Beginning balance | (73) | (90) | (42) | (45) | (53) | (63) | (42) | (63) |
Other comprehensive income (loss) before reclassifications | 8 | 17 | (35) | 1 | 8 | 10 |  |  |
Amounts reclassified from AOCI | 0 | 0 | 0 | 0 | 0 | 0 |  |  |
Total other comprehensive income, net of tax | 8 | 17 | (35) | 1 | 8 | 10 |  |  |
Impact of disposal of a business |  |  | (13) |  |  |  |  |  |
Acquisition of Gulf Power |  |  |  |  |  | 0 |  |  |
Attributable to noncontrolling interests | (1) |  |  |  |  |  | (1) |  |
Attributable to NEE | (64) |  |  |  |  |  | (64) |  |
Ending balance | (65) | (73) | (90) | (44) | (45) | (53) | (65) | (44) |
Other Comprehensive Income (Loss) Related to Equity Method Investees |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |
Beginning balance | 3 | 3 | 3 | 2 | 1 | 2 | 3 | 2 |
Other comprehensive income (loss) before reclassifications | 0 | 0 | 0 | 1 | 1 | (1) |  |  |
Amounts reclassified from AOCI | 0 | 0 | 0 | 0 | 0 | 0 |  |  |
Total other comprehensive income, net of tax | 0 | 0 | 0 | 1 | 1 | (1) |  |  |
Impact of disposal of a business |  |  | 0 |  |  |  |  |  |
Acquisition of Gulf Power |  |  |  |  |  | 0 |  |  |
Attributable to noncontrolling interests | 0 |  |  |  |  |  | 0 |  |
Attributable to NEE | 3 |  |  |  |  |  | 3 |  |
Ending balance | 3 | 3 | 3 | 3 | 2 | 1 | 3 | 3 |
AOCI Attributable to Parent [Member] |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |
Beginning balance | (166) | (198) | (169) | (191) | (213) | (188) | $ (169) | $ (188) |
Total other comprehensive income, net of tax | $ 11 | 29 | (33) | $ 10 | 22 | (24) |  |  |
Ending balance |  | $ (166) | $ (198) |  | $ (191) | $ (213) |  |  |

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