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Consolidated Statements of Total Equity Consolidated Statements of Total Equity (Parenthetical) - shares | 3 Months Ended
--- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
Beginning Balances, shares |  | 376,261,635 |  |
Ending Balances, shares | 373,132,964 |  |  |
Common Stock [Member] |  |  |  |
Beginning Balances, shares | 373,242,060 | 376,261,635 | 375,693,966 | 374,986,079
Exercise of stock options | 831,489 | 806,817 | 1,046,210 | 916,913
Stock issued under employee benefit plans | 1,059,415 | 273,608 | 1,169,341 | 290,974
Repurchases of common stock | (2,000,000) | (4,100,000) | (500,000) | (500,000)
Ending Balances, shares | 373,132,964 | 373,242,060 | 377,409,517 | 375,693,966

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