v3.26.1
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 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Assets        
Balance at beginning of period $ 457 $ 845 $ 484 $ 802
Total gains (losses) included in: Net income 2 19 7 31
Total gains (losses) included in: OCI 0 2 1 3
Transfers Into Level 3 0 0 0 26
Transfers Out of Level 3 (13) (26) (39) (33)
Purchases 66 18 104 43
Sales (4) (83) (9) (96)
Settlements (9) (2) (49) (3)
Balance at end of period 499 773 499 773
Liabilities        
Balance at the beginning of the period (1) (1) (1) 0
Total gains (losses) included in: net income 1 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: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 $ 2 $ 3 $ 8 $ 3
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 $ 1 $ 16 $ 0 $ 27
Other liabilities        
Liabilities        
Balance at the beginning of the period (1) (1) (1) 0
Total gains (losses) included in: net income 1 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)
Fixed income securities        
Assets        
Balance at beginning of period 300 285 308 248
Total gains (losses) included in: Net income 0 0 0 (2)
Total gains (losses) included in: OCI 0 1 1 2
Transfers Into Level 3 0 0 0 26
Transfers Out of Level 3 (10) (26) (36) (33)
Purchases 65 15 97 35
Sales (3) 0 (3) 0
Settlements (8) (2) (23) (3)
Balance at end of period 344 273 344 273
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 0 0 0
Transfers Out of Level 3 0 0 (26) 0
Purchases 0 0 0 0
Sales 0 0 0 0
Settlements 0 0 0 0
Balance at end of period 3 2 3 2
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 0 0 0
Settlements 0 0 0 0
Balance at end of period 12 35 12 35
Corporate - privately placed        
Assets        
Balance at beginning of period 174 109 187 110
Total gains (losses) included in: Net income 0 0 0 (1)
Total gains (losses) included in: OCI (1) 1 0 1
Transfers Into Level 3 0 0 0 0
Transfers Out of Level 3 0 0 0 0
Purchases 4 0 4 0
Sales (3) 0 (3) 0
Settlements (7) (1) (21) (1)
Balance at end of period 167 109 167 109
ABS        
Assets        
Balance at beginning of period 42 51 22 26
Total gains (losses) included in: Net income 0 0 0 0
Total gains (losses) included in: OCI 1 0 1 0
Transfers Into Level 3 0 0 0 26
Transfers Out of Level 3 (10) (26) (10) (26)
Purchases 61 15 82 15
Sales 0 0 0 0
Settlements (1) (1) (2) (2)
Balance at end of period 93 39 93 39
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 0 11 0
Sales 0 0 0 0
Settlements 0 0 0 0
Balance at end of period 69 88 69 88
Equity securities        
Assets        
Balance at beginning of period 18 416 22 407
Total gains (losses) included in: Net income 0 16 (1) 30
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 1 1 5
Sales 0 (75) (4) (84)
Settlements 0 0 0 0
Balance at end of period 18 358 18 358
Short-term investments        
Assets        
Balance at beginning of period 10 2 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 (3) 0 (3) 0
Purchases 1 2 6 3
Sales (1) 0 (2) (4)
Settlements (1) 0 (1) 0
Balance at end of period 6 4 6 4
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 128 134 147 134
Total gains (losses) included in: Net income 2 3 8 3
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 $ 130 137 $ 130 137
Assets held for sale        
Assets        
Balance at beginning of period   7   7
Total gains (losses) included in: Net income   0   0
Total gains (losses) included in: OCI   1   1
Transfers Into Level 3   0   0
Transfers Out of Level 3   0   0
Purchases   0   0
Sales   (8)   (8)
Settlements   0   0
Balance at end of period   $ 0   $ 0