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Shareholders' Equity - Stock Repurchase (Details) - October 2015 Stock Repurchase Program - USD ($) shares in Millions | 3 Months Ended
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Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Total amount of treasury stock repurchased | $ 500,000,000 |  |  |
Treasury stock, shares, acquired (in shares) | 0.7 | 0.6 | 2.8 |
Treasury stock, acquired | $ 50,000,000 | $ 50,000,000 | $ 200,000,000 | $ 200,000,000

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