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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
Statement of Financial Position [Abstract]    
Available-for-sale securities, amortized cost, net $ 30,705,000,000 $ 25,577,000,000
Available for sale securities, allowance for credit losses 8,000,000 19,000,000
Available-for-sale securities, pledged securities, secured trust deposits 460,000,000 455,000,000
Allowance for credit loss 31,000,000 39,000,000
Short-term investments, pledged, secured trust deposits 1,000,000 1,000,000
Cash, pledged, secured trust deposits 480,000,000 270,000,000
Allowance for doubtful accounts, premiums and other receivables 32,000,000 28,000,000
Expected credit losses on reinsurance recoverable $ 20,000,000 $ 21,000,000
Common stock, shares, outstanding (in shares) 283,778,574 291,448,627
Treasury stock (in shares) 41,707,855 31,174,321