Consolidated Balance Sheet Parentheticals (Unaudited at March 31, 2022) - USD ($) shares in Millions, $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Fixed maturities, available for sale, amortized cost	$ 76,158	$ 74,751
Fixed maturities, available for sale, allowance for expected credit losses	4	3
Equity securities, cost	761	749
Premiums receivable, allowance for expected credit losses	89	107
Reinsurance recoverables, allowance for estimated uncollectible reinsurance	135	141
Contractholder receivables, allowance for expected credit losses	$ 19	$ 21
Common stock, shares authorized (in shares)	1,750.0	1,750.0
Common stock, shares issued (in shares)	240.0	241.2
Common stock, shares outstanding (in shares)	240.0	241.2
Treasury stock, at cost (in shares)	544.8	541.5