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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2023
Dec. 31, 2022
ASSETS:    
Amortized Cost $ 26,372 $ 24,191
Fixed maturities - available for sale, allowance for credit loss (63) (54)
Fixed maturities - held to maturity, at amortized cost, net of credit allowances, fair value 781 821
Fixed maturities - held to maturity, at amortized cost, credit allowances (8) (9)
Premium receivable, allowance for credit loss (34) (29)
Reinsurance recoverables on paid losses, allowance (24) (23)
Other assets, allowance for credit loss $ (7) $ (5)
SHAREHOLDERS' EQUITY:    
Preferred stock, par or stated value per share (in dollars per share) $ 10,000.00 $ 10,000.00
Preferred stock, shares authorized (in shares) 50,000,000.0 50,000,000.0
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Common stock, par or stated value per share (in dollars per share) $ 10,000.00 $ 10,000.00
Common shares, authorized (in shares) 200,000,000.0 200,000,000.0
Common shares, outstanding (in shares) 74,200,000 69,900,000
Accumulated other comprehensive income (loss), net deferred income tax expense (benefit) $ (247) $ (250)
Treasury shares (in shares) 30,800,000 30,800,000