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Earnings Per Common Share - Narrative (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Sep. 30, 2014
Antidilutive securities excluded from computation of earnings per share |  |  |
Repurchase and retirement of common stock (in shares) | 3.2 |  |
Remaining number of shares authorized to be repurchased | 24.6 |  | 50.0
Total consideration for repurchase of common stock including unpaid cash | $ 86 |  |
Dividends |  |  |
Cash dividends per common share declared (in dollars per share) | $ 0.095 | $ 0.090 |
Cash dividends per common share paid (in dollars per share) | $ 0.095 | $ 0.090 |
Stock Options |  |  |
Antidilutive securities excluded from computation of earnings per share |  |  |
Antidilutive effect on computation of diluted earnings per common share (in shares) | 1.0 | 8.0 |
Long-term stock awards |  |  |
Antidilutive securities excluded from computation of earnings per share |  |  |
Repurchase and retirement of common stock to offset the dilutive impact of stock awards (in shares) | 1.0 |  |

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