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Claim and Claim Adjustment Expense Reserves and Future Policy Benefit Reserves (Reconciliation of Claim and Claim Adjustment Expense Reserves) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Reserves, beginning of year: |  |  |
Gross | $ 24,174 | $ 22,706 | $ 21,720
Ceded | 4,969 | 4,005 | 3,835
Net reserves, beginning of year | 19,205 | 18,701 | 17,885
Reduction of net reserves due to Excess Workers' Compensation Loss Portfolio Transfer | 0 | (632) | 0
Net incurred claim and claim adjustment expenses: |  |  |
Provision for insured events of current year | 6,243 | 5,970 | 5,793
Increase (decrease) in provision for insured events of prior years | (187) | (104) | (119)
Amortization of discount | 170 | 174 | 183
Total net incurred | 6,226 | 6,040 | 5,857
Net payments attributable to: |  |  |
Current year events | (913) | (1,014) | (948)
Prior year events | (4,348) | (3,830) | (4,216)
Total net payments | (5,261) | (4,844) | (5,164)
Foreign currency translation adjustment and other | (262) | (60) | 123
Net reserves, end of year | 19,908 | 19,205 | 18,701
Ceded reserves, end of year | 5,191 | 4,969 | 4,005
Gross reserves, end of year | $ 25,099 | $ 24,174 | $ 22,706

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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 https://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 https://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
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- Definition Liability as of the balance sheet date for amounts representing estimated cost of settling unpaid claims under the terms of the underlying insurance policies, less estimated reinsurance recoveries on such claims. This includes an estimate for claims which have been incurred but not reported. Claim adjustment expenses represent the costs estimated to be incurred in the settlement of unpaid claims. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(13)(a)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (cc) -URI https://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
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- Definition Sum of adjustments to the estimated reserve for unpaid claims and claims adjustment expense. + 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 -URI https://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
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