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Fair Value - Rollforward of Level 3 assets and liabilities (Details) - Recurring - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Other liabilities        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period $ (20) $ (35) $ (73) $ (22)
Total gains or (losses) (realized/unrealized) - included in earnings [1] 0 (1) 2 (1)
Total gains or (losses) (realized/unrealized) - included in other comprehensive income 0 0 (2) 0
Purchases, issuances, sales and settlements        
Purchases 0 0 0 0
Issuances 0 (9) 0 (22)
Sales 0 0 0 0
Settlements 2 2 55 2
Transfers in and/or out of Level 3 0 0 0 0
Balance at end of period (18) (43) (18) (43)
Available for sale | Structured securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period [2] 17 0 0 0
Total gains or (losses) (realized/unrealized) - included in earnings [1],[2] 0 0 0 0
Total gains or (losses) (realized/unrealized) - included in other comprehensive income [2] 0 0 0 0
Purchases, issuances, sales and settlements        
Purchases [2] 0 0 14 0
Issuances [2] 0 0 0 0
Sales [2] 0 0 0 0
Settlements [2] 0 0 (2) 0
Transfers in and/or out of Level 3 [2] 0 0 5 0
Balance at end of period [2] 17 0 17 0
Available for sale | Corporate bonds        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period 145 160 97 147
Total gains or (losses) (realized/unrealized) - included in earnings [1] 1 0 1 0
Total gains or (losses) (realized/unrealized) - included in other comprehensive income 1 0 1 2
Purchases, issuances, sales and settlements        
Purchases 0 0 0 98
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements (36) (19) (58) (106)
Transfers in and/or out of Level 3 0 0 70 0
Balance at end of period 111 141 111 141
Available for sale | Short-term investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period 0 97 0 84
Total gains or (losses) (realized/unrealized) - included in earnings [1] 0 0 0 0
Total gains or (losses) (realized/unrealized) - included in other comprehensive income 0 0 0 1
Purchases, issuances, sales and settlements        
Purchases 0 0 0 12
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements 0 0 0 0
Transfers in and/or out of Level 3 0 0 0 0
Balance at end of period 0 97 0 97
Fair value option | Other investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period 208 144 189 106
Total gains or (losses) (realized/unrealized) - included in earnings [1] 0 0 0 (4)
Total gains or (losses) (realized/unrealized) - included in other comprehensive income 0 0 0 0
Purchases, issuances, sales and settlements        
Purchases 45 39 141 99
Issuances 0 0 0 0
Sales (2) (2) (5) (4)
Settlements (33) (14) (107) (30)
Transfers in and/or out of Level 3 0 123 0 123
Balance at end of period 218 290 218 290
Fair value option | Short term investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period 45 14 33 10
Total gains or (losses) (realized/unrealized) - included in earnings [1] 0 0 0 0
Total gains or (losses) (realized/unrealized) - included in other comprehensive income 0 0 0 0
Purchases, issuances, sales and settlements        
Purchases 14 5 38 15
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements (21) (4) (33) (10)
Transfers in and/or out of Level 3 0 0 0 0
Balance at end of period 38 15 38 15
Fair value option | Equity securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period 5 4 4 4
Total gains or (losses) (realized/unrealized) - included in earnings [1] 0 0 1 0
Total gains or (losses) (realized/unrealized) - included in other comprehensive income 0 0 0 0
Purchases, issuances, sales and settlements        
Purchases 0 0 0 0
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements 0 0 0 0
Transfers in and/or out of Level 3 0 0 0 0
Balance at end of period 5 4 5 4
Equity securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period 8 6 7 5
Total gains or (losses) (realized/unrealized) - included in earnings [1] 0 0 0 0
Total gains or (losses) (realized/unrealized) - included in other comprehensive income 0 0 0 0
Purchases, issuances, sales and settlements        
Purchases 1 0 2 1
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements 0 0 0 0
Transfers in and/or out of Level 3 0 0 0 0
Balance at end of period $ 9 $ 6 $ 9 $ 6
[1] Gains or losses were included in net realized gains (losses).
[2] Includes asset backed securities, mortgage backed securities and commercial mortgage backed securities.