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Fair Value - Rollforward of Level 3 assets and liabilities (Details) - Recurring - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Other liabilities        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period $ (14) $ (18) $ (14) $ (17)
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 1 0 0
Purchases, issuances, sales and settlements        
Purchases 0 0 0 0
Issuances (5) 0 (5) 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 (19) (17) (19) (17)
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 0 3
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 0 0
Issuances [2] 0 0 0 0
Sales [2] 0 0 0 0
Settlements [2] 0 0 0 0
Transfers in and/or out of Level 3 [2] 0 0 0 0
Balance at end of period [2] 0 3 0 3
Available for sale | Corporate bonds        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period 69 4 121 0
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 43 0 43 0
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements (12) 0 (65) 0
Transfers in and/or out of Level 3 0 0 0 4
Balance at end of period 100 4 100 4
Fair value option | Other investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period 46 23 33 28
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 40 11 58 11
Issuances 0 0 0 0
Sales 0 0 (4) (2)
Settlements 0 0 0 (3)
Transfers in and/or out of Level 3 0 0 0 0
Balance at end of period 86 34 86 34
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 4 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 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 4 5 4 5
Equity securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period 5 3 4 3
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 0 0 1 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 $ 3 $ 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.