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Reserve for Known and Incurred but Not Reported Claims (Narrative) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Reserve For Known And Incurred But Not Reported Claims [Line Items] |  |  |
Payments, net of recoveries, related to: Current year | $ 292 | $ 268 | $ 227
Payments, net of recoveries, related to: Prior years | 190 | 203 | $ 188
Payments on reinsured losses | 4 | 21 |
Reinsurance recoveries | $ 3 | $ 10 |
Provision for title loss, percentage of title premiums and escrow fees | 4.00% | 5.00% | 4.00%
Ultimate loss rate | 4.00% | 4.50% | 4.00%
Estimated percentage increase in loss reserve for prior policy years |  | 0.50% |
Estimated increase in loss reserve for prior policy years | $ 0 | $ 26 | $ 0
Specialty Insurance |  |  |
Reserve For Known And Incurred But Not Reported Claims [Line Items] |  |  |
Payments, net of recoveries, related to: Current year | 264 | 250 | 211
Payments, net of recoveries, related to: Prior years | $ 64 | $ 57 | $ 42

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- Definition The provision for title losses expressed as a percentage of title premiums and escrow fees. + References No definition available. + Details
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- Definition Percentage increase in loss reserve estimates for prior policy years. + References No definition available. + Details
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- Definition Amount, after valuation allowance, received in the period under reinsurance contracts including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves. + References No definition available. + Details
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- Definition Reserve for known and incurred but not reported claims. + References No definition available. + Details
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- Definition Ultimate loss rate percentage. + References No definition available. + Details
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- Definition Amount, after effects of reinsurance, of payments to settle claims incurred in the current period and related claims settlement costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
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- Definition Amount, after effects of reinsurance, of payments to settle claims incurred in prior periods and related claims settlement costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
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- Definition Amount, after valuation allowance, recoverable under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, policy benefits and policy reserves. Excludes premiums paid under reinsurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=99404803&loc=d3e21412-158489 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=99404803&loc=d3e21409-158489 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=99397103&loc=d3e6824-158387 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 825 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123600520&loc=SL75241803-196195 + Details
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