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Fair Value - Rollforward of Level 3 assets and liabilities (Details) - Recurring - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Other liabilities    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of period $ (73) $ (22)
Total gains or (losses) (realized/unrealized) - included in earnings [1] 2 0
Total gains or (losses) (realized/unrealized) - included in other comprehensive income 0 0
Purchases, issuances, sales and settlements    
Purchases 0 0
Issuances 0 0
Sales 0 0
Settlements 37 0
Transfers in and/or out of Level 3 0 0
Balance at end of period (34) (22)
Available for sale | Corporate bonds    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of period 97 147
Total gains or (losses) (realized/unrealized) - included in earnings [1] 0 0
Total gains or (losses) (realized/unrealized) - included in other comprehensive income 0 2
Purchases, issuances, sales and settlements    
Purchases 0 98
Issuances 0 0
Sales 0 0
Settlements (17) (87)
Transfers in and/or out of Level 3 70 0
Balance at end of period 150 160
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 84
Total gains or (losses) (realized/unrealized) - included in earnings [1] 0 0
Total gains or (losses) (realized/unrealized) - included in other comprehensive income 0 1
Purchases, issuances, sales and settlements    
Purchases 0 12
Issuances 0 0
Sales 0 0
Settlements 0 0
Transfers in and/or out of Level 3 0 0
Balance at end of period 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 189 106
Total gains or (losses) (realized/unrealized) - included in earnings [1] 0 (4)
Total gains or (losses) (realized/unrealized) - included in other comprehensive income 0 0
Purchases, issuances, sales and settlements    
Purchases 52 30
Issuances 0 0
Sales 0 0
Settlements (35) (6)
Transfers in and/or out of Level 3 0 0
Balance at end of period 206 126
Fair value option | Short term investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of period 33 10
Total gains or (losses) (realized/unrealized) - included in earnings [1] 0 0
Total gains or (losses) (realized/unrealized) - included in other comprehensive income 0 0
Purchases, issuances, sales and settlements    
Purchases 6 7
Issuances 0 0
Sales 0 0
Settlements (10) 0
Transfers in and/or out of Level 3 0 0
Balance at end of period 29 17
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
Total gains or (losses) (realized/unrealized) - included in earnings [1] 0 0
Total gains or (losses) (realized/unrealized) - included in other comprehensive income 0 0
Purchases, issuances, sales and settlements    
Purchases 0 0
Issuances 0 0
Sales 0 0
Settlements 0 0
Transfers in and/or out of Level 3 0 0
Balance at end of period 4 4
Equity securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of period 7 5
Total gains or (losses) (realized/unrealized) - included in earnings [1] 0 0
Total gains or (losses) (realized/unrealized) - included in other comprehensive income 0 0
Purchases, issuances, sales and settlements    
Purchases 0 0
Issuances 0 0
Sales 0 0
Settlements 0 0
Transfers in and/or out of Level 3 0 0
Balance at end of period $ 7 $ 5
[1] Gains or losses were included in net realized gains (losses).