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Reserve for Unpaid Losses and Loss Adjustment Expenses (Tables)
3 Months Ended
Mar. 31, 2023
Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block]
Unfavorable (Favorable) Prior Accident Year Development
For the three months ended March 31,
20232022
Workers’ compensation$(61)$(45)
Workers’ compensation discount accretion11 
General liability12 12 
Marine— 
Package business(5)(11)
Commercial property(15)
Professional liability— — 
Bond— — 
Assumed reinsurance12 
Automobile liability - Commercial Lines— — 
Automobile liability - Personal Lines— (5)
Homeowners(1)— 
Net asbestos and environmental reserves— — 
Catastrophes— (3)
Uncollectible reinsurance— 
Other reserve re-estimates, net 28 10 
Total prior accident year development$ $(36)
Group Benefits  
Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block]
Rollforward of Liabilities for Unpaid Losses and Loss Adjustment Expenses
For the three months ended March 31,
20232022
Beginning liabilities for unpaid losses and loss adjustment expenses, gross$8,160 $8,210 
Reinsurance recoverables245 245 
Beginning liabilities for unpaid losses and loss adjustment expenses, net7,915 7,965 
Provision for unpaid losses and loss adjustment expenses
Current incurral year1,325 1,324 
Prior year's discount accretion53 53 
Prior incurral year development [1](133)(119)
Total provision for unpaid losses and loss adjustment expenses [2]1,245 1,258 
Payments
Current incurral year(335)(354)
Prior incurral years(889)(974)
Total payments(1,224)(1,328)
Ending liabilities for unpaid losses and loss adjustment expenses, net7,936 7,895 
Reinsurance recoverables248 247 
Ending liabilities for unpaid losses and loss adjustment expenses, gross$8,184 $8,142 
[1]Prior incurral year development represents the change in estimated ultimate incurred losses and loss adjustment expenses for prior incurral years on a discounted basis.
[2]Includes unallocated loss adjustment expenses ("ULAE") of $45 and $46 for the three months ended March 31, 2023 and 2022, respectively, that are recorded in insurance operating costs and other expenses in the Condensed Consolidated Statements of Operations
Property, Liability and Casualty Insurance Product Line  
Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block]
Rollforward of Liabilities for Unpaid Losses and Loss Adjustment Expenses
 For the three months ended March 31,
 20232022
Beginning liabilities for unpaid losses and loss adjustment expenses, gross
$33,083 $31,449 
Reinsurance and other recoverables6,465 6,081 
Beginning liabilities for unpaid losses and loss adjustment expenses, net
26,618 25,368 
Provision for unpaid losses and loss adjustment expenses
  
Current accident year2,270 1,931 
Prior accident year development— (36)
Total provision for unpaid losses and loss adjustment expenses
2,270 1,895 
Payments
  
Current accident year(321)(281)
Prior accident years(1,646)(1,525)
Total payments
(1,967)(1,806)
Foreign currency adjustment(5)
Ending liabilities for unpaid losses and loss adjustment expenses, net
26,929 25,452 
Reinsurance and other recoverables6,469 6,165 
Ending liabilities for unpaid losses and loss adjustment expenses, gross
$33,398 $31,617