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Per Share Data (Narrative) (Details) - shares | 6 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021
Earnings Per Share [Abstract] |  |
Weighted average number of shares held in grantor trust (in shares) | 11,592,699,000 | 11,651,811

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- Definition Number of shares of restricted stock determined by relating the portion of time within a reporting period that restricted shares have been outstanding to the total time in that period. Restricted shares are subject to sales, contractual, regulatory or other restrictions that prevent or inhibit the holder from freely disposing of them before the restriction ends. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=125511455&loc=d3e2646-109256 + Details
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