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Equity (Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |
Other comprehensive income (loss) before reclassifications | $ 31 | $ (43) | $ 15 | $ (35) |  |  |
Amounts reclassified from AOCI | 1 | 4 | 7 | 11 |  |  |
Total other comprehensive income (loss), net of tax | 32 | (39) | 22 | (24) | $ (7) | $ (2) |
Impact of disposal of a business |  | 10 |  |  |  |  |
Acquisition of Gulf Power |  |  |  | (1) |  |  |
Attributable to noncontrolling interests | (3) |  |  |  | (3) |  |
Attributable to NEE | (163) |  |  |  | (163) |  | $ (169)
Net Unrealized Gains (Losses) on Cash Flow Hedges |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |
Beginning balance | (2) | (27) | (46) | (55) | (27) | (55) |
Other comprehensive income (loss) before reclassifications | 0 | 0 | 0 | 0 |  |  |
Amounts reclassified from AOCI | 3 | 2 | 8 | 10 |  |  |
Total other comprehensive income (loss), net of tax | 3 | 2 | 8 | 10 |  |  |
Impact of disposal of a business |  | 23 |  |  |  |  |
Acquisition of Gulf Power |  |  |  | (1) |  |  |
Attributable to noncontrolling interests | 0 |  |  |  | 0 |  |
Attributable to NEE | 1 |  |  |  | 1 |  |
Ending balance | 1 | (2) | (38) | (46) | 1 | (38) |
Net Unrealized Gains (Losses) on Available for Sale Securities |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |
Beginning balance | 2 | 11 | 3 | (7) | 11 | (7) |
Other comprehensive income (loss) before reclassifications | 14 | (8) | 7 | 8 |  |  |
Amounts reclassified from AOCI | 0 | (1) | (1) | 2 |  |  |
Total other comprehensive income (loss), net of tax | 14 | (9) | 6 | 10 |  |  |
Impact of disposal of a business |  | 0 |  |  |  |  |
Acquisition of Gulf Power |  |  |  | 0 |  |  |
Attributable to noncontrolling interests | 0 |  |  |  | 0 |  |
Attributable to NEE | 16 |  |  |  | 16 |  |
Ending balance | 16 | 2 | 9 | 3 | 16 | 9 |
Defined Benefit Pension and Other Benefits Plans |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |
Beginning balance | (111) | (114) | (118) | (65) | (114) | (65) |
Other comprehensive income (loss) before reclassifications | 0 | 0 | (1) | (52) |  |  |
Amounts reclassified from AOCI | (2) | 3 | 0 | (1) |  |  |
Total other comprehensive income (loss), net of tax | (2) | 3 | (1) | (53) |  |  |
Impact of disposal of a business |  | 0 |  |  |  |  |
Acquisition of Gulf Power |  |  |  | 0 |  |  |
Attributable to noncontrolling interests | 0 |  |  |  | 0 |  |
Attributable to NEE | (113) |  |  |  | (113) |  |
Ending balance | (113) | (111) | (119) | (118) | (113) | (119) |
Net Unrealized Gains (Losses) on Foreign Currency Translation |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |
Beginning balance | (90) | (42) | (53) | (63) | (42) | (63) |
Other comprehensive income (loss) before reclassifications | 17 | (35) | 8 | 10 |  |  |
Amounts reclassified from AOCI | 0 | 0 | 0 | 0 |  |  |
Total other comprehensive income (loss), net of tax | 17 | (35) | 8 | 10 |  |  |
Impact of disposal of a business |  | (13) |  |  |  |  |
Acquisition of Gulf Power |  |  |  | 0 |  |  |
Attributable to noncontrolling interests | (3) |  |  |  | (3) |  |
Attributable to NEE | (70) |  |  |  | (70) |  |
Ending balance | (73) | (90) | (45) | (53) | (73) | (45) |
Other Comprehensive Income (Loss) Related to Equity Method Investees |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |
Beginning balance | 3 | 3 | 1 | 2 | 3 | 2 |
Other comprehensive income (loss) before reclassifications | 0 | 0 | 1 | (1) |  |  |
Amounts reclassified from AOCI | 0 | 0 | 0 | 0 |  |  |
Total other comprehensive income (loss), net of tax | 0 | 0 | 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 | 2 | 1 | 3 | 2 |
AOCI Attributable to Parent [Member] |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |
Beginning balance | (198) | (169) | (213) | (188) | (169) | (188) |
Total other comprehensive income (loss), net of tax | 29 | (33) | 22 | (24) |  |  |
Ending balance | $ (166) | $ (198) | $ (191) | $ (213) | $ (166) | $ (191) |

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