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Supplemental Share Information (Parenthetical) - shares | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Increase (decrease) in equity |  |  |
Treasury stock, beginning balance (in shares) | 366,283,418 | 368,848,221 | 367,457,888
Reacquired stock (in shares) | 11,834,681 | 2,286,109 | 7,575,647
Issuances pursuant to stock options and benefit plans (in shares) | (5,930,521) | (4,850,912) | (6,185,314)
Treasury stock, ending balance (in shares) | 372,187,578 | 366,283,418 | 368,848,221

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