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Insurance (Tables)
 3 Months Ended
Mar. 31, 2024
Insurance [Abstract]  
Reconciliation of beginning and ending liability for unpaid losses and loss adjustment expenses The following table provides an analysis of changes in the liability for losses and loss adjustment expenses during the first three months of 2024 and 2023 (in millions):
Three months ended March 31,
20242023
Balance at beginning of year$13,087 $11,974 
Less reinsurance recoverables, net of allowance4,288 3,767 
Net liability at beginning of year8,799 8,207 
Provision for losses and LAE occurring in the current period962 883 
Net decrease in the provision for claims of prior years
(50)(63)
Total losses and LAE incurred912 820 
Payments for losses and LAE of:
Current year(94)(66)
Prior years(895)(815)
Total payments(989)(881)
Foreign currency translation and other1 1 
Net liability at end of period8,723 8,147 
Add back reinsurance recoverables, net of allowance4,327 3,614 
Gross unpaid losses and LAE included in the balance sheet at end of period$13,050 $11,761 
Reinsurance recoverable and premiums receivable, allowance for credit loss Progressions of the 2024 and 2023 allowance for expected credit losses on recoverables from reinsurers and premiums receivable are shown below (in millions):
Recoverables from ReinsurersPremiums Receivable
2024202320242023
Balance at December 31$10 $8 $15 $8 
Provision (credit) for expected credit losses— 1 — — 
Write-offs charged against the allowance— — — — 
Balance at March 31$10 $9 $15 $8