Consolidated Balance Sheet Parentheticals (Unaudited at September 30, 2023) - USD ($) shares in Millions, $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Fixed maturities, available for sale, amortized cost	$ 80,792	$ 77,380
Fixed maturities, available for sale, allowance for expected credit losses	4	3
Equity securities, cost	546	747
Premiums receivable, allowance for expected credit losses	68	77
Reinsurance recoverables, allowance for estimated uncollectible reinsurance	121	132
Contractholder receivables, allowance for expected credit losses	$ 20	$ 17
Common stock, shares authorized (in shares)	1,750.0	1,750.0
Common stock, shares issued (in shares)	228.4	232.1
Common stock, shares outstanding (in shares)	228.4	232.1
Treasury stock, at cost (in shares)	558.8	553.5