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Schedule V - Valuation And Qualifying Accounts (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Reserve Deducted From Accounts Receivable |  |  |  |
Valuation And Qualifying Accounts Disclosure [Line Items] |  |  |  |
Balance at beginning of period |  | $ 14 | $ 13 | $ 14
Additions Charged to costs and expenses |  | 4 | 7 | 4
Deductions from reserve | [1] | 4 | 6 | 5
Balance at end of period |  | 14 | 14 | 13
Reserve For Known And Incurred But Not Reported Claims |  |  |  |
Valuation And Qualifying Accounts Disclosure [Line Items] |  |  |  |
Balance at beginning of period |  | 1,178 | 1,063 | 1,042
Additions Charged to costs and expenses |  | 589 | 580 | 446
Additions Charged to other accounts |  | (1) | 6 | (10)
Deductions from reserve | [2] | 482 | 471 | 415
Balance at end of period |  | 1,284 | 1,178 | 1,063
Reserve Deducted From Deferred Income Taxes |  |  |  |
Valuation And Qualifying Accounts Disclosure [Line Items] |  |  |  |
Balance at beginning of period |  | 9 | 10 | 11
Deductions from reserve |  | 1 | 1 | 1
Balance at end of period |  | $ 8 | $ 9 | $ 10
[1] | Amount represents accounts written off, net of recoveries.
[2] | Amount represents claim payments, net of recoveries.

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column B)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column E)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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- Definition Amount of increase in valuation and qualifying accounts and reserves from charge to cost and expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column C)(1)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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- Definition Amount of decrease in valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column D)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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