Commitments - Fuel and Power Purchase Agreements Narrative (Details) - USD ($) $ in Millions |
12 Months Ended | ||
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Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
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| Georgia Power | |||
| Recorded Unconditional Purchase Obligation [Line Items] | |||
| Operating leases, contingent rent expense | $ 43 | $ 44 | $ 18 |
| Georgia Power | Plant Vogtle (nuclear) Units 1 and 2 | |||
| Recorded Unconditional Purchase Obligation [Line Items] | |||
| Capacity payments | 8 | 9 | $ 11 |
| Total | 59 | ||
| 2019 | 6 | ||
| 2020 | 5 | ||
| 2021 | 5 | ||
| 2022 | 4 | ||
| 2023 | 3 | ||
| 2024 and thereafter | 36 | ||
| Mississippi Power | |||
| Recorded Unconditional Purchase Obligation [Line Items] | |||
| Operating leases, contingent rent expense | $ 10 | $ 5 | |
| MEAG Power | Georgia Power | |||
| Recorded Unconditional Purchase Obligation [Line Items] | |||
| Percent ownership | 5.00% | ||
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- Definition Capacity Payments No definition available.
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- Definition The proportionate share of interest (percent) in a jointly owned utility plant. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The increases or decreases in lease payments that result from changes occurring after the inception of the lease in the factors (other than the passage of time) on which lease payments are based, except that any escalation of minimum lease payments relating to increases in construction or acquisition cost of the leased property or for increases in some measure of cost or value during the construction or preconstruction period, are excluded from contingent rentals. Contingent rentals also may include amounts for which the triggering events have not yet occurred or the specified targets for which have not yet been achieved (such as sales based percentage rent), but which events are considered probable of occurring or which specified targets are considered probable of being achieved. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of the recorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of the recorded unconditional purchase obligation maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of the recorded unconditional purchase obligation maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of the recorded unconditional purchase obligation maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of the recorded unconditional purchase obligation maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of the recorded unconditional purchase obligation maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of the recorded unconditional purchase obligation maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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