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Equity (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Mar. 31, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Stock Issued During Period, Shares, New Issues | 10,400,000 |  |  |
Proceeds from Issuance of Common Stock |  | $ 271 | $ 0 | $ 271

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