Condensed Consolidated Balance Sheets - (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Investments:
Fixed maturities securities at amortized cost	$ 38,969	$ 38,126
Marketable securities, fixed maturities, amortized cost	47	0
Equity securities at cost	927	820
Mortgage loans on real estate, commercial and consumer, allowance for credit loss	21	0
Allowance for uncollectible reinsurance	24	25
Allowance for uncollectible insurance receivables	32	32
Accumulated depreciation on property and equipment	224	215
Liabilities
Due to related parties	47	21
Due from related parties	$ 0	$ 21
Stockholders' Equity
Common stock, par value (in usd per share)	$ 2.50	$ 2.50
Common stock, shares authorized (in shares)	500,000,000	500,000,000
Common stock, shares issued (in shares)	273,040,243	273,040,243
Common stock, shares outstanding (in shares)	271,387,058	271,412,591
Treasury stock, shares (in shares)	1,653,185	1,627,652