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Financings and Capitalization (Issuance of Common Stock) (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended
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May 31, 2018 | Jun. 30, 2017
Debt Disclosure [Abstract] |  |
Number of shares issued (in shares) | 638,898 | 1,494,371
Average price per share (in dollars per share) | $ 45.83 | $ 47.31
Net Proceeds (In Millions) | $ 29 | $ 70

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