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Earnings Per Share (Narratives) (Details) - shares shares in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Earnings Per Share [Abstract] |  |  |
Common shares outstanding | 341.4 | 345.0 | 351.1

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- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. + 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 + Details
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Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
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Balance Type: | na
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