Consolidated Balance Sheets (Parentheticals) (Unaudited) $ in Millions	Mar. 31, 2023 USD ($) shares	Dec. 31, 2022 USD ($) shares
Statement of Financial Position [Abstract]
Fixed maturities, available-for-sale, valuation allowance	$ 168	$ 169
Fixed maturities, available-for-sale, at amortized cost	94,709	93,355
Fixed maturities, held-to-maturity, valuation allowance	33	34
Fixed maturities, held-to-maturity, fair value	8,109	8,439
Short-term investments amortized cost	3,695	4,962
Premium Receivable, Allowance for Credit Loss	51	52
Valuation allowance for uncollectible reinsurance	$ 351	$ 351
Common Shares, shares issued | shares	446,376,614	446,376,614
Common Shares, shares outstanding | shares	414,158,680	414,594,856