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Fair Value - Rollforward of Level 3 assets and liabilities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Other liabilities    
Level 3 liabilities rollforward    
Balance at beginning of year $ (73) $ (22)
Total gains or (losses) (realized/unrealized) - included in earnings [1] 2 10
Total gains or (losses) (realized/unrealized) - included in other comprehensive income (2) 1
Purchases, issuances, sales and settlements    
Purchases 0 0
Issuances 0 (64)
Sales 0 0
Settlements 55 2
Transfers in and/or out of Level 3 0 0
Balance at end of year (18) (73)
Equity securities    
Level 3 assets rollforward    
Balance at beginning of year 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 2 2
Issuances 0 0
Sales 0 0
Settlements 0 0
Transfers in and/or out of Level 3 0 0
Balance at end of year 9 7
Available for sale | Structured securities    
Level 3 assets rollforward    
Balance at beginning of year [2] 0 0
Total gains or (losses) (realized/unrealized) - included in earnings [1],[2] 0 0
Total gains or (losses) (realized/unrealized) - included in other comprehensive income [2] 0 0
Purchases, issuances, sales and settlements    
Purchases [2] 14 0
Issuances [2] 0 0
Sales [2] 0 0
Settlements [2] (2) 0
Transfers in and/or out of Level 3 [2] 5 0
Balance at end of year [2] 17 0
Available for sale | Corporate bonds    
Level 3 assets rollforward    
Balance at beginning of year 97 147
Total gains or (losses) (realized/unrealized) - included in earnings [1] 1 1
Total gains or (losses) (realized/unrealized) - included in other comprehensive income 1 2
Purchases, issuances, sales and settlements    
Purchases 1 100
Issuances 0 0
Sales 0 0
Settlements (60) (153)
Transfers in and/or out of Level 3 88 0
Balance at end of year 128 97
Available for sale | Short-term investments    
Level 3 assets rollforward    
Balance at beginning of year 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 (97)
Transfers in and/or out of Level 3 0 0
Balance at end of year 0 0
Fair value option | Other investments    
Level 3 assets rollforward    
Balance at beginning of year 189 106
Total gains or (losses) (realized/unrealized) - included in earnings [1] 0 (5)
Total gains or (losses) (realized/unrealized) - included in other comprehensive income 0 0
Purchases, issuances, sales and settlements    
Purchases 190 148
Issuances 0 0
Sales (5) (5)
Settlements (146) (70)
Transfers in and/or out of Level 3 4 15
Balance at end of year 232 189
Fair value option | Short-term investments    
Level 3 assets rollforward    
Balance at beginning of year 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 67 41
Issuances 0 0
Sales 0 0
Settlements (60) (18)
Transfers in and/or out of Level 3 0 0
Balance at end of year 40 33
Fair value option | Equity securities    
Level 3 assets rollforward    
Balance at beginning of year 4 4
Total gains or (losses) (realized/unrealized) - included in earnings [1] 1 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 year $ 5 $ 4
[1] Gains or losses were included in net realized gains (losses).
[2] Includes asset backed securities, mortgage backed securities and commercial mortgage backed securities.