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Fair Value - Rollforward of Level 3 assets and liabilities (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Purchases, issuances, sales and settlements        
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Net realized gains (losses) Net realized gains (losses) Net realized gains (losses) Net realized gains (losses)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Net realized gains (losses) Net realized gains (losses) Net realized gains (losses) Net realized gains (losses)
Recurring | Other liabilities        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period $ (34) $ (22) $ (73) $ (22)
Total gains or (losses) (realized/unrealized) - included in earnings [1] 0 0 2 (1)
Total gains or (losses) (realized/unrealized) - included in other comprehensive income (2) 0 (2) 1
Purchases, issuances, sales and settlements        
Purchases 0 0 0 0
Issuances 0 (13) 0 (13)
Sales 0 0 0 0
Settlements 16 0 53 0
Transfers in and/or out of Level 3 0 0 0 0
Balance at end of period (20) (35) (20) (35)
Recurring | Available for sale | Structured securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period [2] 0 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] 14 0 14 0
Issuances [2] 0 0 0 0
Sales [2] 0 0 0 0
Settlements [2] (2) 0 (2) 0
Transfers in and/or out of Level 3 [2] 5 0 5 0
Balance at end of period [2] 17 0 17 0
Recurring | Available for sale | Corporate bonds        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period 150 160 97 147
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 2
Purchases, issuances, sales and settlements        
Purchases 0 0 0 98
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements (5) 0 (22) (87)
Transfers in and/or out of Level 3 0 0 70 0
Balance at end of period 145 160 145 160
Recurring | 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
Recurring | Fair value option | Other investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period 206 126 189 106
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 44 30 96 60
Issuances 0 0 0 0
Sales (3) (2) (3) (2)
Settlements (39) (10) (74) (16)
Transfers in and/or out of Level 3 0 0 0 0
Balance at end of period 208 144 208 144
Recurring | Fair value option | Short term investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period 29 17 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 18 3 24 10
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements (2) (6) (12) (6)
Transfers in and/or out of Level 3 0 0 0 0
Balance at end of period 45 14 45 14
Recurring | Fair value option | Equity securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period 4 4 4 4
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 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
Recurring | Equity securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period 7 5 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 1 1 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 $ 8 $ 6 $ 8 $ 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.