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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
Dec. 31, 2022
Dec. 31, 2021
Statement of Financial Position [Abstract]    
Available-for-sale securities, amortized cost, net $ 37,708,000,000 $ 30,705,000,000
Available for sale securities, allowance for credit losses 39,000,000 8,000,000
Available-for-sale securities, pledged securities, secured trust deposits 448,000,000 460,000,000
Mortgage loans, allowance for credit loss 42,000,000 31,000,000
Short-term investments, pledged, secured trust deposits 6,000,000 1,000,000
Cash, pledged, secured trust deposits 242,000,000 480,000,000
Allowance for doubtful accounts, premiums and other receivables 33,000,000 32,000,000
Expected credit losses on reinsurance recoverable $ 10,000,000 $ 20,000,000
Common stock, par value per share (in dollars per share) $ 0.0001 $ 0.0001
Common stock, shares authorized (in shares) 600,000,000 600,000,000
Common stock, shares, outstanding (in shares) 272,309,890 283,778,574
Common stock, shares, issued (in shares) 327,757,349 325,486,429
Preferred stock, par or stated value per share (in dollars per share) $ 0.0001 $ 0.0001
Preferred stock, shares authorized (in shares) 50,000,000 50,000,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Treasury stock (in shares) 55,447,459 41,707,855