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Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares shares in Millions | Mar. 31, 2018 | Dec. 31, 2017
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Statement of Financial Position [Abstract] |  |
Common stock and additional paid-in capital, par value (in usd per share) | $ 0.0001 | $ 0.0001
Common stock and additional paid-in capital, shares authorized | 2,750.0 | 2,750.0
Common stock and additional paid-in capital, shares outstanding | 666.4 | 722.2

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