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Capital Structure - Changes in Common Shares issued and Outstanding (Details) - shares | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Capital Structure |  |  |  |
Preferred stock, shares authorized (in shares) | 10,000,000 | 10,000,000 | 10,000,000 | 10,000,000
Common stock, shares authorized (in shares) | 500,000,000 | 500,000,000 | 500,000,000 | 500,000,000
Increase (Decrease) in Stockholders' Equity (in shares) |  |  |  |
Beginning balance, common shares issued (in shares) | 418,323,134 |  |  |
Beginning balance, treasury shares(in shares) | (101,580,045) |  |  |
Beginning balance, common shares outstanding (in shares) | 316,743,089 |  |  |
Share repurchases (in shares) | (35,234,664) |  |  |
Ending balance, common shares issued (in shares) | 420,288,886 | 418,323,134 |  |
Ending balance, treasury shares (in shares) | (136,638,847) | (101,580,045) |  |
Ending balance, common shares outstanding (in shares) | 283,650,039 | 316,743,089 |  |
Common Stock |  |  |  |
Increase (Decrease) in Stockholders' Equity (in shares) |  |  |  |
Beginning balance, common shares issued (in shares) | 418,323,134 | 417,583,825 | 416,939,950 |
Beginning balance, common shares outstanding (in shares) | 316,743,089 | 315,443,011 | 314,190,042 |
Shares issued under ESPP (in shares) | 175,862 | 560,769 | 609,094 |
Shares issued from LTIP (in shares) | 1,965,752 | 739,309 | 643,875 |
Ending balance, common shares issued (in shares) | 420,288,886 | 418,323,134 | 417,583,825 |
Ending balance, common shares outstanding (in shares) | 283,650,039 | 316,743,089 | 315,443,011 |
Treasury Stock |  |  |  |
Increase (Decrease) in Stockholders' Equity (in shares) |  |  |  |
Beginning balance, treasury shares(in shares) | (101,580,045) | (102,140,814) | (102,749,908) |
Shares issued under ESPP (in shares) | 175,862 | 560,769 | 609,094 |
Shares issued from LTIP (in shares) | 0 | 0 | 0 |
Share repurchases (in shares) | (35,234,664) |  |  |
Ending balance, treasury shares (in shares) | (136,638,847) | (101,580,045) | (102,140,814) |

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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The maximum number of securities classified as temporary equity that are permitted to be issued by an entity's charter and bylaws. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(27)(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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