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Consolidated Statement of Shareholders' Investment (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Common Shares:
Increase (Decrease) in Shareholders' Investment
Balance at beginning of period (in shares)	1,976,855,085	1,971,189,465	1,965,908,188
Issued under incentive stock programs (in shares)	4,301,811	5,665,620	5,281,277
Balance at end of period (in shares)	1,981,156,896	1,976,855,085	1,971,189,465
Common Shares Held in Treasury:
Increase (Decrease) in Shareholders' Investment
Balance at beginning of period (in shares)	214,351,838	215,570,043	222,305,719
Issued under incentive stock programs (in shares)	6,290,757	7,796,030	8,870,735
Purchased (in shares)	1,865,541	6,577,825	2,135,059
Balance at end of period (in shares)	209,926,622	214,351,838	215,570,043
Earnings Employed in the Business:
Increase (Decrease) in Shareholders' Investment
Cash dividends declared per common share	$ 1.53	$ 1.32	$ 1.16

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