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Equity (Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Accumulated other comprehensive loss, beginning |  | $ (188) | $ 111 | $ (70) |
Other comprehensive income before reclassifications | $ 198 | (3) | (53) |  |
Amounts reclassified from AOCI | (6) | 24 | 24 |  |
Total other comprehensive income (loss), net of tax | 192 | 21 | (29) | 192 |
Less other comprehensive income attributable to noncontrolling interests | 11 | 1 |  |  |
Accumulated other comprehensive loss, ending |  | (169) | (188) | 111 |
AOCI Impact of NEP Deconsolidation |  | 0 | 58 | 0 |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  | $ (328)
Acquisition of Gulf Power |  | (1) |  |  |
Net Unrealized Gains (Losses) on Cash Flow Hedges |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Accumulated other comprehensive loss, beginning |  | (55) | (77) | (100) |
Other comprehensive income before reclassifications | 0 | 0 | 0 |  |
Amounts reclassified from AOCI | 32 | 29 | 26 |  |
Total other comprehensive income (loss), net of tax | 32 | 29 | 26 |  |
Less other comprehensive income attributable to noncontrolling interests | 9 | 0 |  |  |
Accumulated other comprehensive loss, ending |  | (27) | (55) | (77) |
AOCI Impact of NEP Deconsolidation |  |  | 3 |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  | (7)
Acquisition of Gulf Power |  | (1) |  |  |
Net Unrealized Gains (Losses) on Available for Sale Securities |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Accumulated other comprehensive loss, beginning |  | (7) | 316 | 225 |
Other comprehensive income before reclassifications | 127 | 20 | (12) |  |
Amounts reclassified from AOCI | (36) | (2) | 1 |  |
Total other comprehensive income (loss), net of tax | 91 | 18 | (11) |  |
Less other comprehensive income attributable to noncontrolling interests | 0 | 0 |  |  |
Accumulated other comprehensive loss, ending |  | 11 | (7) | 316 |
AOCI Impact of NEP Deconsolidation |  |  | 0 |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  | (312)
Acquisition of Gulf Power |  | 0 |  |  |
Defined Benefit Pension and Other Benefits Plans |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Accumulated other comprehensive loss, beginning |  | (65) | (39) | (83) |
Other comprehensive income before reclassifications | 46 | (46) | (14) |  |
Amounts reclassified from AOCI | (2) | (3) | (3) |  |
Total other comprehensive income (loss), net of tax | 44 | (49) | (17) |  |
Less other comprehensive income attributable to noncontrolling interests | 0 | 0 |  |  |
Accumulated other comprehensive loss, ending |  | (114) | (65) | (39) |
AOCI Impact of NEP Deconsolidation |  |  | 0 |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  | (9)
Acquisition of Gulf Power |  | 0 |  |  |
Net Unrealized Gains (Losses) on Foreign Currency Translation |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Accumulated other comprehensive loss, beginning |  | (63) | (69) | (90) |
Other comprehensive income before reclassifications | 23 | 22 | (31) |  |
Amounts reclassified from AOCI | 0 | 0 | 0 |  |
Total other comprehensive income (loss), net of tax | 23 | 22 | (31) |  |
Less other comprehensive income attributable to noncontrolling interests | 2 | 1 |  |  |
Accumulated other comprehensive loss, ending |  | (42) | (63) | (69) |
AOCI Impact of NEP Deconsolidation |  |  | 37 |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  | 0
Acquisition of Gulf Power |  | 0 |  |  |
Other Comprehensive Income (Loss) Related to Equity Method Investees |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Accumulated other comprehensive loss, beginning |  | 2 | (20) | (22) |
Other comprehensive income before reclassifications | 2 | 1 | 4 |  |
Amounts reclassified from AOCI | 0 | 0 | 0 |  |
Total other comprehensive income (loss), net of tax | 2 | 1 | 4 |  |
Less other comprehensive income attributable to noncontrolling interests | $ 0 | 0 |  |  |
Accumulated other comprehensive loss, ending |  | 3 | 2 | $ (20) |
AOCI Impact of NEP Deconsolidation |  |  | $ 18 |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  | $ 0
Acquisition of Gulf Power |  | $ 0 |  |  |

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