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Reserve for Property and Casualty Insurance Claims and Claims Expense - Rollforward of reserve for property and casualty insurance claims and claims expense (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Activity in the reserve for property-liability insurance claims and claims expense: |  |  |
Balance as of January 1 | $ 27,712 | $ 27,423 |
Net balance as of January 1 | 20,800 | 20,268 | $ 19,854
Incurred claims and claims expense related to: |  |  |
Prior years | (436) | (130) | (255)
Total incurred | 22,001 | 23,976 | 22,778
Claims and claims expense paid related to: |  |  |
Total paid | (22,224) | (23,444) | (22,364)
Net balance as of December 31 | 20,577 | 20,800 | 20,268
Balance as of December 31 | 27,610 | 27,712 | 27,423
Property and casualty |  |  |
Activity in the reserve for property-liability insurance claims and claims expense: |  |  |
Balance as of January 1 | 27,712 | 27,423 | 26,325
Less recoverables | (6,912) | (7,155) | (6,471)
Incurred claims and claims expense related to: |  |  |
Current year | 22,437 | 24,106 | 23,033
Prior years | (436) | (130) | (255)
Claims and claims expense paid related to: |  |  |
Current year | (14,245) | (15,160) | (14,877)
Prior years | (7,979) | (8,284) | (7,487)
Plus recoverables | $ (7,033) | (6,912) | (7,155)
Balance as of December 31 |  | $ 27,712 | $ 27,423

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- Definition The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + 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 (a) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 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 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 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 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 http://asc.fasb.org/extlink&oid=120400017&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 http://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 http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
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