Consolidated Balance Sheet Parentheticals - USD ($) shares in Millions, $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Fixed maturities, available for sale, amortized cost	$ 81,781	$ 77,380
Fixed maturities, available for sale, allowance for expected credit losses	5	3
Equity securities, cost	553	747
Premiums receivable, allowance for expected credit losses	69	77	$ 107
Reinsurance recoverables, allowance for estimated uncollectible reinsurance	118	132	141
Contractholder receivables, allowance for expected credit losses	$ 20	$ 17	$ 21
Common stock, shares authorized (in shares)	1,750.0	1,750.0
Common stock, shares issued (in shares)	228.2	232.1
Common stock, shares outstanding (in shares)	228.2	232.1
Treasury stock, at cost (in shares)	559.2	553.5