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Earnings Per Common Share - Narrative (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Sep. 30, 2014
Antidilutive securities excluded from computation of earnings per share |  |  |  |  |
Remaining number of shares authorized to be repurchased (in shares) | 21,800 |  | 21,800 |  | 50,000
Repurchase and retirement of common stock (in shares) |  |  | 6,000 |  |
Total consideration for repurchase of common stock including unpaid cash |  |  | $ 174 |  |
Payments for repurchase of common stock |  |  | $ 168 | $ 207 |
Dividends |  |  |  |  |
Cash dividends per common share paid (in dollars per share) | $ 0.095 | $ 0.090 | $ 0.19 | $ 0.18 |
Cash dividends per common share declared (in dollars per share) | $ 0.095 | $ 0.090 | $ 0.19 | $ 0.18 |
Stock Options |  |  |  |  |
Antidilutive securities excluded from computation of earnings per share |  |  |  |  |
Antidilutive effect on computation of diluted earnings per common share (in shares) | 380 | 6,000 | 1,000 | 9,000 |
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) |  |  | 1,100 |  |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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