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Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2017
State [Line Items] |  |  |
Revenue Capitalized During Pre-Commercial Operations | $ 0 | $ 1 | $ 1
Electric revenue | (2,681) | (2,509) |
Other revenue | 44 | 40 |
ALABAMA |  |  |
State [Line Items] |  |  |
Electric revenue | (392) | (361) |
GEORGIA |  |  |
State [Line Items] |  |  |
Electric revenue | (67) | (63) |
KENTUCKY |  |  |
State [Line Items] |  |  |
Electric revenue | (168) | (159) |
MISSISSIPPI |  |  |
State [Line Items] |  |  |
Electric revenue | (251) | (237) |
NORTH CAROLINA |  |  |
State [Line Items] |  |  |
Electric revenue | (20) | (16) |
TENNESSEE |  |  |
State [Line Items] |  |  |
Electric revenue | (1,771) | (1,660) |
VIRGINIA |  |  |
State [Line Items] |  |  |
Electric revenue | $ (12) | $ (12) |

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- Definition Revenue from sales of electricity + References No definition available. + Details
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- Definition Other revenue + References No definition available. + Details
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- Definition Estimates of revenue realized from pre-commercial generation based on the guidance provided by FERC regulations. The calculated revenue is capitalized to offset project costs and is included in revenue as a contra-revenue amount + References No definition available. + Details
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