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Schedule III — Supplementary Insurance Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Supplementary Insurance Information      
Deferred policy acquisition costs $ 5,418 $ 4,722 $ 3,774
Reserves for claims and claims expense, contract benefits and contractholder funds 39,711 35,241 29,495
Unearned premiums 22,311 19,844 15,946
Premium revenue and contract charges 47,737 44,039 38,167
Net investment income 2,403 3,293 1,590
Claims and claims expense, contract benefits and interest credited to contractholders 38,325 30,367 22,550
Amortization of deferred policy acquisition costs 6,644 6,252 5,477
Other operating costs and expenses 8,301 7,521 7,080
Premiums written (excluding life) 50,080 45,630 38,497
Intersegment Eliminations      
Supplementary Insurance Information      
Deferred policy acquisition costs 0 0 0
Reserves for claims and claims expense, contract benefits and contractholder funds 0 0 0
Unearned premiums 0 0 0
Premium revenue and contract charges (149) (175) (147)
Net investment income 0 0 0
Claims and claims expense, contract benefits and interest credited to contractholders 0 (16) (11)
Amortization of deferred policy acquisition costs 0 0 0
Other operating costs and expenses (149) (159) (136)
Premiums written (excluding life) 0 0 0
Allstate Protection | Operating segments      
Supplementary Insurance Information      
Deferred policy acquisition costs 2,146 1,951 1,608
Reserves for claims and claims expense, contract benefits and contractholder funds 35,537 31,099 25,679
Unearned premiums 17,538 15,763 12,772
Premium revenue and contract charges 43,909 40,454 35,580
Claims and claims expense, contract benefits and interest credited to contractholders 36,607 28,760 21,485
Amortization of deferred policy acquisition costs 5,570 5,313 4,642
Other operating costs and expenses 5,930 6,033 5,741
Premiums written (excluding life) 45,787 41,358 35,768
Run-off Property-Liability | Operating segments      
Supplementary Insurance Information      
Deferred policy acquisition costs 0 0 0
Reserves for claims and claims expense, contract benefits and contractholder funds 1,955 1,916 1,888
Unearned premiums 0 0 0
Premium revenue and contract charges 0 0 0
Claims and claims expense, contract benefits and interest credited to contractholders 125 116 141
Amortization of deferred policy acquisition costs 0 0 0
Other operating costs and expenses 4 4 3
Premiums written (excluding life) 0 0 0
Property-Liability | Operating segments      
Supplementary Insurance Information      
Deferred policy acquisition costs 2,146 1,951 1,608
Reserves for claims and claims expense, contract benefits and contractholder funds 37,492 33,015 27,567
Unearned premiums 17,538 15,763 12,772
Premium revenue and contract charges 43,909 40,454 35,580
Net investment income 2,190 3,118 1,421
Claims and claims expense, contract benefits and interest credited to contractholders 36,732 28,876 21,626
Amortization of deferred policy acquisition costs 5,570 5,313 4,642
Other operating costs and expenses 5,934 6,037 5,744
Premiums written (excluding life) 45,787 41,358 35,768
Protection Services | Operating segments      
Supplementary Insurance Information      
Deferred policy acquisition costs 2,768 2,294 1,696
Reserves for claims and claims expense, contract benefits and contractholder funds 49 45 43
Unearned premiums 4,745 4,054 3,167
Premium revenue and contract charges 2,144 1,939 1,640
Net investment income 48 43 44
Claims and claims expense, contract benefits and interest credited to contractholders 532 458 386
Amortization of deferred policy acquisition costs 928 795 658
Other operating costs and expenses 952 938 760
Premiums written (excluding life) 2,699 2,642 1,890
Allstate Health and Benefits | Operating segments      
Supplementary Insurance Information      
Deferred policy acquisition costs 504 477 470
Reserves for claims and claims expense, contract benefits and contractholder funds 2,170 2,181 1,885
Unearned premiums 28 27 7
Premium revenue and contract charges 1,833 1,821 1,094
Net investment income 69 74 78
Claims and claims expense, contract benefits and interest credited to contractholders 1,061 1,049 549
Amortization of deferred policy acquisition costs 146 144 177
Other operating costs and expenses 852 838 323
Premiums written (excluding life) 1,594 1,630 839
Corporate and Other | Operating segments      
Supplementary Insurance Information      
Deferred policy acquisition costs 0 0 0
Reserves for claims and claims expense, contract benefits and contractholder funds 0 0 0
Unearned premiums 0 0 0
Premium revenue and contract charges 0 0 0
Net investment income 96 58 47
Claims and claims expense, contract benefits and interest credited to contractholders 0 0 0
Amortization of deferred policy acquisition costs 0 0 0
Other operating costs and expenses 712 (133) 389
Premiums written (excluding life) $ 0 $ 0 $ 0