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Financing and Capitalization (Summary of Stock Issuances) (Details) - USD ($) $ in Millions | 1 Months Ended
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May 31, 2018 | Jun. 30, 2017
Debt Disclosure [Abstract] |  |
Common stock issued (in shares) | 638,898 | 1,494,371
Common stock issued | $ 29 | $ 70

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