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Earnings Per Share Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Document Period End Date | Mar. 31, 2017 |
Document Fiscal Year Focus | 2017 |
Net Income (Loss) Available to Common Stockholders, Diluted | $ (107) | $ (51)
Basic and diluted weighted average shares outstanding (a) | 85.7 | 96.3
Diluted | $ (1.25) | $ (0.53)
Basic | $ (1.25) | $ (0.53)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 0.8 | 0.8
Restricted Stock Units (RSUs) [Member] |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 2.6 | 2.4

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