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Consolidated Balance Sheets (Parentheticals) - USD ($) shares in Millions, $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Fixed maturities available for sale, at amortized cost	$ 26,195	$ 22,615
Allowance for credit losses on investments	28	41
Investments accounted for using the fair value option	2,488	1,644
Allowance for credit losses on premiums receivable	34	35
Allowance for credit losses on reinsurance recoverable	21	22
Allowance for credit loss on contractholder receivable	$ 3	$ 3
Common shares, par value per share	$ 0.0011	$ 0.0011
Common shares issued (shares)	591.9	588.3
Common shares held in treasury (shares)	218.5	217.9
Fixed maturities available for sale, at fair value (amortized cost: $24,131 and $21,282; net of allowance for credit losses: $28 and $41)
Fixed maturities available for sale, at amortized cost	$ 24,131	$ 21,282
Allowance for credit losses on investments	28	41
Short-term investments
Fixed maturities available for sale, at amortized cost	2,064	1,333
Allowance for credit losses on investments	$ 0	$ 0

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