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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Statement of Financial Position [Abstract]    
Available for sale securities, allowance for credit losses $ 13 $ 19
Available-for-sale securities, pledged securities, secured trust deposits 459 455
Allowance for credit loss 34 39
Short-term investments, pledged, secured trust deposits 3 1
Cash, pledged, secured trust deposits 485 270
Allowance for doubtful accounts, premiums and other receivables 28 28
Expected credit losses on reinsurance recoverable $ 20 $ 21
Common stock, par or stated 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) 285,689,238 291,448,627
Common stock, shares, issued (in shares) 323,664,713 322,622,948
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) 37,975,475 31,174,321