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Earnings Per Common Share - Narrative (Details) - USD ($) | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2018 | Feb. 28, 2018 | Mar. 31, 2018 | Mar. 31, 2017 | Feb. 16, 2018 | May 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |
Amount authorized for repurchase |  |  |  |  | $ 150,000,000 | $ 1,500,000,000
Stock repurchased during period (in shares) | 900,000 | 2,800,000 |  |  |  |
Stock repurchased and retired during period (in shares) |  |  | 3,700,000 |  |  |
Remaining amount authorized to be repurchased | $ 1,100,000,000 |  | $ 1,100,000,000 |  |  |
Dividends |  |  |  |  |  |
Cash dividends per common share paid (in dollars per share) |  |  | $ 0.105 | $ 0.1 |  |
Cash dividends per common share declared (in dollars per share) |  |  | $ 0.105 | $ 0.100 |  |
Stock options |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |
Antidilutive effect on computation of diluted earnings per common share (in shares) |  |  | 431,000 | 221,000 |  |
Long-term stock awards |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |
Stock repurchased And retired during period to offset dilutive impact of awards granted shares (in shares) |  |  | 600,000 |  |  |

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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 -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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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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