v3.26.3
Fair Value of Assets and Liabilities - Schedule of Rollforward of Level 3 Assets and Liabilities Held at Fair Value (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Assets        
Balance at beginning of period $ 499 $ 773 $ 484 $ 802
Total gains (losses) included in: Net income (1) 2 6 33
Total gains (losses) included in: OCI (2) 1 (1) 4
Transfers Into Level 3 0 1 0 27
Transfers Out of Level 3 (9) (63) (48) (96)
Purchases 107 59 211 102
Sales (4) (4) (13) (100)
Settlements (21) (3) (70) (6)
Balance at end of period 569 766 569 766
Liabilities        
Balance at the beginning of the period 0 (1) (1) 0
Total gains (losses) included in: net income 0 0 1 (1)
Total gains (losses) included in: OCI 0 0 0 0
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Purchases 0 0 0 0
Sales 0 0 0 0
Settlements 0 0 0 0
Balance at the end of the period $ 0 $ (1) $ 0 $ (1)
Income Statement Location [Axis]: us-gaap:NetInvestmentIncome        
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 investment income Net investment income Net investment income Net investment income
Gain (loss) included in earnings $ 0 $ 1 $ 0 $ 1
Income Statement Location [Axis]: us-gaap:OtherCostAndExpenseOperating        
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 Operating costs and expenses
Gain (loss) included in earnings $ (1) $ 3 $ 7 $ 6
Income Statement Location [Axis]: us-gaap:RealizedInvestmentGainsLosses        
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 Net gains (losses) on investments and derivatives
Gain (loss) included in earnings $ 0 $ (2) $ 0 $ 25
Other liabilities        
Liabilities        
Balance at the beginning of the period   (1) (1) 0
Total gains (losses) included in: net income   0 1 (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
Purchases   0 0 0
Sales   0 0 0
Settlements   0 0 0
Balance at the end of the period 0 (1) 0 (1)
Fixed income securities        
Assets        
Balance at beginning of period 344 273 308 248
Total gains (losses) included in: Net income 0 0 0 (2)
Total gains (losses) included in: OCI (2) 1 (1) 3
Transfers Into Level 3 0 1 0 27
Transfers Out of Level 3 (9) (15) (45) (48)
Purchases 106 50 203 85
Sales 0 (1) (3) (1)
Settlements (21) (3) (44) (6)
Balance at end of period 418 306 418 306
Municipal        
Assets        
Balance at beginning of period 3 2 29 2
Total gains (losses) included in: Net income 0 0 0 0
Total gains (losses) included in: OCI 0 0 0 0
Transfers Into Level 3 0 1 0 1
Transfers Out of Level 3 0 0 (26) 0
Purchases 2 0 2 0
Sales 0 0 0 0
Settlements 0 0 0 0
Balance at end of period 5 3 5 3
Corporate - public        
Assets        
Balance at beginning of period 12 35 12 22
Total gains (losses) included in: Net income 0 0 0 (1)
Total gains (losses) included in: OCI 0 0 0 1
Transfers Into Level 3 0 0 0 0
Transfers Out of Level 3 0 0 0 (7)
Purchases 0 0 0 20
Sales 0 (1) 0 (1)
Settlements 0 0 0 0
Balance at end of period 12 34 12 34
Corporate - privately placed        
Assets        
Balance at beginning of period 167 109 187 110
Total gains (losses) included in: Net income 0 0 0 (1)
Total gains (losses) included in: OCI (1) 1 (1) 2
Transfers Into Level 3 0 0 0 0
Transfers Out of Level 3 0 0 0 0
Purchases 15 48 19 48
Sales 0 0 (3) 0
Settlements (4) (2) (25) (3)
Balance at end of period 177 156 177 156
ABS        
Assets        
Balance at beginning of period 93 39 22 26
Total gains (losses) included in: Net income 0 0 0 0
Total gains (losses) included in: OCI (1) 0 0 0
Transfers Into Level 3 0 0 0 26
Transfers Out of Level 3 (9) (15) (19) (41)
Purchases 89 0 171 15
Sales 0 0 0 0
Settlements (3) 0 (5) (2)
Balance at end of period 169 24 169 24
MBS        
Assets        
Balance at beginning of period 69 88 58 88
Total gains (losses) included in: Net income 0 0 0 0
Total gains (losses) included in: OCI 0 0 0 0
Transfers Into Level 3 0 0 0 0
Transfers Out of Level 3 0 0 0 0
Purchases 0 2 11 2
Sales 0 0 0 0
Settlements (14) (1) (14) (1)
Balance at end of period 55 89 55 89
Equity securities        
Assets        
Balance at beginning of period 18 358 22 407
Total gains (losses) included in: Net income 0 (1) (1) 29
Total gains (losses) included in: OCI 0 0 0 0
Transfers Into Level 3 0 0 0 0
Transfers Out of Level 3 0 (48) 0 (48)
Purchases 0 3 1 8
Sales 0 (2) (4) (86)
Settlements 0 0 0 0
Balance at end of period 18 310 18 310
Short-term investments        
Assets        
Balance at beginning of period 6 4 6 5
Total gains (losses) included in: Net income 0 0 0 0
Total gains (losses) included in: OCI 0 0 0 0
Transfers Into Level 3 0 0 0 0
Transfers Out of Level 3 0 0 (3) 0
Purchases 1 6 7 9
Sales (4) (1) (6) (5)
Settlements 0 0 (1) 0
Balance at end of period 3 9 3 9
Other investments        
Assets        
Balance at beginning of period 1 1 1 1
Total gains (losses) included in: Net income 0 0 0 0
Total gains (losses) included in: OCI 0 0 0 0
Transfers Into Level 3 0 0 0 0
Transfers Out of Level 3 0 0 0 0
Purchases 0 0 0 0
Sales 0 0 0 0
Settlements 0 0 0 0
Balance at end of period 1 1 1 1
Other assets        
Assets        
Balance at beginning of period 130 137 147 134
Total gains (losses) included in: Net income (1) 3 7 6
Total gains (losses) included in: OCI 0 0 0 0
Transfers Into Level 3 0 0 0 0
Transfers Out of Level 3 0 0 0 0
Purchases 0 0 0 0
Sales 0 0 0 0
Settlements 0 0 (25) 0
Balance at end of period $ 129 140 $ 129 140
Assets held for sale        
Assets        
Balance at beginning of period       7
Total gains (losses) included in: Net income       0
Total gains (losses) included in: OCI       1
Transfers Into Level 3       0
Transfers Out of Level 3       0
Purchases       0
Sales       (8)
Settlements       0
Balance at end of period   $ 0   $ 0