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Fair Value of Assets and Liabilities - Schedule of Rollforward of Level 3 Assets and Liabilities Held at Fair Value (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Assets      
Balance at beginning of period $ 802 $ 676 $ 618
Total gains (losses) included in: Net income 36 23 40
Total gains (losses) included in: OCI 6 (1) 2
Transfers Into Level 3 39 0 16
Transfers Out of Level 3 (379) 0 0
Transfers (to) from held for sale   0  
Purchases 153 191 122
Sales (117) (76) (101)
Settlements (56) (11) (21)
Balance at end of period $ 484 $ 802 $ 676
Liabilities      
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Allstate Protection and Run-off Property-Liability net investment income, Net gains (losses) on investments and derivatives Allstate Protection and Run-off Property-Liability net investment income, Net gains (losses) on investments and derivatives Allstate Protection and Run-off Property-Liability net investment income, Net gains (losses) on investments and derivatives
Balance at the beginning of the period $ 0 $ 0 $ 0
Total gains (losses) included in: net income (1) 0 0
Total gains (losses) included in: OCI 0 0 0
Transfers into Level 3 0 0 0
Transfers out of Level 3 0 0 0
Transfers (to) from held for sale   0  
Purchases 0 0 0
Sales 0 0 0
Settlements 0 0 0
Balance at the end of the period $ (1) $ 0 $ 0
Net investment income      
Total Level 3 gains (losses) included in net income      
Fair Value, Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Allstate Protection and Run-off Property-Liability net investment income Allstate Protection and Run-off Property-Liability net investment income Allstate Protection and Run-off Property-Liability net investment income
Gain (loss) included in earnings $ 1 $ (8) $ (1)
Net gains (losses) on investments and derivatives      
Total Level 3 gains (losses) included in net income      
Fair Value, Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Net gains (losses) on investments and derivatives Net gains (losses) on investments and derivatives Net gains (losses) on investments and derivatives
Gain (loss) included in earnings $ 21 $ 15 $ 26
Operating costs and expenses      
Total Level 3 gains (losses) included in net income      
Fair Value, Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Operating costs and expenses Operating costs and expenses Operating costs and expenses
Gain (loss) included in earnings $ 13 $ 16 $ 15
Other liabilities      
Assets      
Total gains (losses) included in: Net income (1)    
Liabilities      
Balance at the beginning of the period 0    
Total gains (losses) included in: OCI 0    
Transfers into Level 3 0    
Transfers out of Level 3 0    
Purchases 0    
Sales 0    
Settlements 0    
Balance at the end of the period (1) 0  
Municipal      
Assets      
Balance at beginning of period 2 11 21
Total gains (losses) included in: Net income 0 (2) 3
Total gains (losses) included in: OCI 0 1 (1)
Transfers Into Level 3 1 0 0
Transfers Out of Level 3 0 0 0
Transfers (to) from held for sale   0  
Purchases 26 0 0
Sales 0 (5) (10)
Settlements 0 (3) (2)
Balance at end of period 29 2 11
Corporate - public      
Assets      
Balance at beginning of period 22 26 69
Total gains (losses) included in: Net income (1) 1 (1)
Total gains (losses) included in: OCI 1 0 2
Transfers Into Level 3 0 0 0
Transfers Out of Level 3 (7) 0 0
Transfers (to) from held for sale   (7)  
Purchases 11 16 0
Sales (11) (14) (44)
Settlements (3) 0 0
Balance at end of period 12 22 26
Corporate - privately placed      
Assets      
Balance at beginning of period 110 58 55
Total gains (losses) included in: Net income (4) (6) (12)
Total gains (losses) included in: OCI 4 (2) 1
Transfers Into Level 3 12 0 16
Transfers Out of Level 3 0 0 0
Transfers (to) from held for sale   0  
Purchases 83 64 1
Sales 0 (2) (3)
Settlements (18) (2) 0
Balance at end of period 187 110 58
ABS      
Assets      
Balance at beginning of period 26    
Total gains (losses) included in: Net income 0    
Total gains (losses) included in: OCI 0    
Transfers Into Level 3 26    
Transfers Out of Level 3 (41)    
Purchases 15    
Sales 0    
Settlements (4)    
Balance at end of period 22 26  
MBS      
Assets      
Balance at beginning of period 88    
Total gains (losses) included in: Net income 0    
Total gains (losses) included in: OCI 0    
Transfers Into Level 3 0    
Transfers Out of Level 3 0    
Purchases 0    
Sales 0    
Settlements (30)    
Balance at end of period 58 88  
ABS and MBS      
Assets      
Balance at beginning of period 114 58 28
Total gains (losses) included in: Net income   0 0
Total gains (losses) included in: OCI   0 0
Transfers Into Level 3   0 0
Transfers Out of Level 3   0 0
Transfers (to) from held for sale   0  
Purchases   59 31
Sales   0 0
Settlements   (3) (1)
Balance at end of period   114 58
Fixed income securities      
Assets      
Balance at beginning of period 248 153 173
Total gains (losses) included in: Net income (5) (7) (10)
Total gains (losses) included in: OCI 5 (1) 2
Transfers Into Level 3 39 0 16
Transfers Out of Level 3 (48) 0 0
Transfers (to) from held for sale   (7)  
Purchases 135 139 32
Sales (11) (21) (57)
Settlements (55) (8) (3)
Balance at end of period 308 248 153
Equity securities      
Assets      
Balance at beginning of period 407 402 333
Total gains (losses) included in: Net income 28 8 36
Total gains (losses) included in: OCI 0 0 0
Transfers Into Level 3 0 0 0
Transfers Out of Level 3 (331) 0 0
Transfers (to) from held for sale   0  
Purchases 7 25 77
Sales (89) (28) (44)
Settlements 0 0 0
Balance at end of period 22 407 402
Short-term investments      
Assets      
Balance at beginning of period 5 1 6
Total gains (losses) included in: Net income 0 0 0
Total gains (losses) included in: OCI 0 0 0
Transfers Into Level 3 0 0 0
Transfers Out of Level 3 0 0 0
Transfers (to) from held for sale   0  
Purchases 11 27 13
Sales (9) (20) 0
Settlements (1) (3) (18)
Balance at end of period 6 5 1
Other investments      
Assets      
Balance at beginning of period 1 2 3
Total gains (losses) included in: Net income 0 6 (1)
Total gains (losses) included in: OCI 0 0 0
Transfers Into Level 3 0 0 0
Transfers Out of Level 3 0 0 0
Transfers (to) from held for sale   0  
Purchases 0 0 0
Sales 0 (7) 0
Settlements 0 0 0
Balance at end of period 1 1 2
Other assets      
Assets      
Balance at beginning of period 134 118 103
Total gains (losses) included in: Net income 13 16 15
Total gains (losses) included in: OCI 0 0 0
Transfers Into Level 3 0   0
Transfers Out of Level 3 0   0
Transfers (to) from held for sale   0  
Purchases 0   0
Sales 0   0
Settlements 0   0
Balance at end of period 147 134 118
Assets held for sale      
Assets      
Balance at beginning of period 7 0  
Total gains (losses) included in: Net income 0 0  
Total gains (losses) included in: OCI 1 0  
Transfers Into Level 3 0 0  
Transfers Out of Level 3 0 0  
Transfers (to) from held for sale   7  
Purchases 0 0  
Sales (8) 0  
Settlements 0 0  
Balance at end of period $ 0 $ 7 $ 0