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Capital Stock (Narrative) (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
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Capital Stock [Abstract] |  |
Authorized amount of shares repurchase | $ 669,000,000 | $ 1,000,000,000
Preferred stock, shares authorized (in shares) | 30,000,000 | 30,000,000

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- Definition Capital Stock [Abstract] + References No definition available. + Details
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- Definition The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. + 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(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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