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Fair Value - Rollforward of Level 3 assets and liabilities (Details) - Recurring - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Other liabilities    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of period $ (14) $ (17)
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 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 (14) (18)
Available for sale | Corporate bonds    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of period 121 0
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 (53) 0
Transfers in and/or out of Level 3 0 4
Balance at end of period 69 4
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 3
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] 0 0
Issuances [2] 0 0
Sales [2] 0 0
Settlements [2] 0 0
Transfers in and/or out of Level 3 [2] 0 0
Balance at end of period [2] 0 3
Fair value option | Other investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of period 33 28
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 18 0
Issuances 0 0
Sales (4) (2)
Settlements 0 (3)
Transfers in and/or out of Level 3 0 0
Balance at end of period 46 23
Fair value option | Equity securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of period 4 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 4 5
Equity securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of period 4 3
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 1 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 $ 5 $ 3
[1] Gains or losses were included in net realized gains (losses).
[2] Includes asset backed securities, residential mortgage backed securities and commercial mortgage backed securities.