Consolidated Balance Sheet Parentheticals - USD ($) shares in Millions, $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Fixed maturities, available for sale, amortized cost	$ 74,751	$ 68,830
Fixed maturities, available for sale, allowance for expected credit losses	3	2
Equity securities, cost	749	415
Premiums receivable, allowance for expected credit losses	107	105	$ 49
Reinsurance recoverables, allowance for estimated uncollectible reinsurance	141	146	92
Contractholder receivables, allowance for expected credit losses	$ 21	$ 19	$ 20
Common stock, shares authorized (in shares)	1,750.0	1,750.0
Common stock, shares issued (in shares)	241.2	252.4
Common stock, shares outstanding (in shares)	241.2	252.4
Treasury stock, at cost (in shares)	541.5	527.3