Consolidated Balance Sheet Parentheticals (Unaudited at March 31, 2024) - USD ($) shares in Millions, $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Statement of Financial Position [Abstract]
Fixed maturities, available for sale, amortized cost	$ 82,712	$ 81,781
Fixed maturities, available for sale, allowance for expected credit losses	3	5
Equity securities, cost	557	553
Premiums receivable, allowance for expected credit losses	68	69
Reinsurance recoverables, allowance for estimated uncollectible reinsurance	117	118
Contractholder receivables, allowance for expected credit losses	$ 19	$ 20
Common stock, shares authorized (in shares)	1,750.0	1,750.0
Common stock, shares issued (in shares)	229.0	228.2
Common stock, shares outstanding (in shares)	229.0	228.2
Treasury stock, at cost (in shares)	561.0	559.2