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Unpaid losses and loss expenses (RF) (Details) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021
Unpaid Losses and Loss Expenses [Roll Forward] |  |  |
Gross unpaid losses and loss expenses – beginning of period |  | $ 72,943 | $ 67,811
Reinsurance recoverable on unpaid losses – beginning of period (1) | [1] | (16,184) | (14,647)
Net unpaid losses and loss expenses – beginning of period |  | 56,759 | 53,164
Current Year Claims and Claims Adjustment Expense |  | 10,846 | 10,546
Prior Year Claims and Claims Adjustment Expense | [2] | (651) | (487)
Total, Incurred |  | 10,195 | 10,059
Net loss and loss expenses paid, Current Year |  | 2,281 | 2,355
Net loss and loss expenses paid, Prior Years |  | 6,566 | 5,531
Total, Paid |  | 8,847 | 7,886
Liability For Unpaid Claims And Claims Adjustment Expense Foreign Currency Revaluation And Other |  | (588) | 231
Net unpaid losses and loss expenses – end of period |  | 57,519 | 55,568
Reinsurance recoverable on unpaid losses (1) | [1] | 16,573 | 14,721
Gross unpaid losses and loss expenses – end of period |  | 74,092 | 70,289
prior period development, net adjustments |  | 164 | $ 27
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease), Gross |  | 1,149 |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) |  | $ 760 |
[1] | Net of valuation allowance for uncollectible reinsurance.
[2] | Relates to prior period loss reserve development only and excludes prior period development related to reinstatement premiums, expense adjustments and earned premiums totaling $164 million and $27 million for the six months ended June 30, 2022 and 2021, respectively.

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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 https://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 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 Amount, after valuation allowance, recoverable under reinsurance contracts for losses reported to the ceding insurer but not yet paid and amounts expected for incurred losses and settlement expenses, which have not yet been reported to the ceding insurer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=99404803&loc=d3e21412-158489 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=99397103&loc=d3e6824-158387 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 Reference 4: 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 + Details
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