Shareholders' Equity (Summary of Shares Outstanding) (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Shareholders' Equity Note [Line Items]
Preferred stock without par value (in dollars per share)	$ 10,000,000
Shares of common stock authorized	1,200,000,000
Per share cash dividends paid (in dollars per share)	$ 2.42	$ 2.26	$ 2.10
Common stock, par or stated value per share	$ 1.667
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	235,907,026	236,686,265	235,680,470
Purchases (in shares)	(1,269,830)	(1,521,765)
Issuances (in shares)	436,730	742,526	1,005,795
Ending balance (in shares)	235,073,926	235,907,026	236,686,265
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	581,146,136	581,146,136	581,146,136
Ending balance (in shares)	581,146,136	581,146,136	581,146,136
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	345,239,110	344,459,871	345,465,666
Purchases (in shares)	(1,269,830)	(1,521,765)
Issuances (in shares)	436,730	742,526	1,005,795
Ending balance (in shares)	346,072,210	345,239,110	344,459,871