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Employee Benefit Plans (Summary of Activity in Corporation's Active Stock Plans) (Detail) - $ / shares | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock options exercised, number of shares | (399,810) | (987,758) | (408,563)
Director deferred stock units outstanding [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Ending balance, number of shares/units | 45,661 | 56,301 | 52,860
Beginning balance, number of shares/units | 56,301 | 52,860 | 55,370
Ending balance, weighted-average grant-date fair value | $ 87.15 | $ 79.21 | $ 75.47
Beginning balance, weighted-average grant-date fair value | $ 79.21 | $ 75.47 | $ 74.76
Granted in period, number of shares/units | 5,382 | 5,940 | 10,428
Granted in period, weighted-average grant-date fair value | $ 133.67 | $ 117.90 | $ 73.84
Stock awards exercised/vested in period, number of shares | (16,022) | (2,499) | (12,938)
Stock awards exercised/vested in period, weighted-average grant date fair value | $ 74.89 | $ 92.03 | $ 71.09
Non-Vested Stock Awards/ Stock Units Outstanding [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Ending balance, number of shares/units | 465,319 | 449,337 | 470,359
Beginning balance, number of shares/units | 449,337 | 470,359 | 440,647
Ending balance, weighted-average grant-date fair value | $ 105.36 | $ 93.05 | $ 86.24
Beginning balance, weighted-average grant-date fair value | $ 93.05 | $ 86.24 | $ 90.22
Granted in period, number of shares/units | 119,176 | 95,258 | 151,038
Granted in period, weighted-average grant-date fair value | $ 142.56 | $ 130.36 | $ 66.79
Stock awards exercised/vested in period, number of shares | (97,154) | (88,250) | (117,990)
Stock awards exercised/vested in period, weighted-average grant date fair value | $ 94.81 | $ 98.90 | $ 76.07
Forfeited/expired in period, number of shares/units | (6,040) | (28,030) | (3,336)
Forfeited/expired in period, weighted-average grant date fair value | $ 93.28 | $ 87.08 | $ 91.07
Share-based Payment Arrangement, Option [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Ending balance, number of shares | 616,227 | 877,681 | 1,739,559
Beginning balance, number of shares | 877,681 | 1,739,559 | 1,980,866
Ending balance, weighted-average exercise price | $ 71.27 | $ 69.02 | $ 66.11
Beginning balance, weighted-average exercise price | $ 69.02 | $ 66.11 | $ 64.60
Stock options exercised, number of shares | (261,454) | (861,878) | (235,880)
Stock options exercised, weighted-average exercise price | $ 63.72 | $ 63.14 | $ 53.23
Forfeited/expired, number of shares |  |  | (5,427)
Forfeited/expired, weighted-average exercise price |  |  | $ 75.74
Maximum [Member] | Performance Shares [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Ending balance, number of shares/units | 213,749 | 202,460 | 201,257
Beginning balance, number of shares/units | 202,460 | 201,257 | 177,288
Ending balance, weighted-average grant-date fair value | $ 96.20 | $ 84.71 | $ 77.18
Beginning balance, weighted-average grant-date fair value | $ 84.71 | $ 77.18 | $ 83.48
Granted in period, number of shares/units | 52,527 | 46,086 | 72,618
Granted in period, weighted-average grant-date fair value | $ 133.40 | $ 121.46 | $ 57.89
Stock awards exercised/vested in period, number of shares | (25,180) | (35,131) | (41,755)
Stock awards exercised/vested in period, weighted-average grant date fair value | $ 87.18 | $ 92.27 | $ 69.70
Forfeited/expired in period, number of shares/units | (16,058) | (9,752) | (6,894)
Forfeited/expired in period, weighted-average grant date fair value | $ 87.18 | $ 75.70 | $ 81.33

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(03) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(03) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(ii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(ii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(02) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(02) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(03) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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