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Earnings Per Common Share (Details 2) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2015 | Aug. 31, 2015 | Sep. 30, 2015 | Mar. 31, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Antidilutive securities excluded from computation of earnings per share |  |  |  |  |  |  |
Repurchase and retirement of common stock (in shares) |  |  |  |  |  | 15,500 |
Total consideration for repurchase of common stock including unpaid cash |  |  |  |  |  | $ 407 |
Stock repurchased during period |  | $ 200 |  |  |  |  |
Stock repurchased during period (in shares) | 1,500 | 6,100 |  |  |  |  |
Remaining number of shares authorized to be repurchased | 29,500 |  | 29,500 |  |  | 29,500 |
Dividends |  |  |  |  |  |  |
Cash dividends per common share paid (in dollars per share) |  |  | $ 0.090 |  | $ 0.090 | $ 0.270 | $ 0.240
Cash dividends per common share declared (in dollars per share) |  |  | $ 0.095 |  | $ 0.090 | $ 0.275 | $ 0.255
Stock Options |  |  |  |  |  |  |
Antidilutive securities excluded from computation of earnings per share |  |  |  |  |  |  |
Antidilutive effect on computation of diluted earnings per common share (in shares) |  |  | 4,000 |  | 8,000 | 6,000 | 8,000
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) |  |  |  | 720 |  |  |

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