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Consolidated Balance Sheets (Parentheticals) $ in Millions | Dec. 31, 2021 USD ($) shares | Dec. 31, 2020 USD ($) shares
--- | --- | ---
Statement of Financial Position [Abstract] |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | $ 14 | $ 20
Fixed maturities available for sale, at amortized cost | 90,493 | 85,188
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 35 | 44
Debt Securities, Held-to-maturity, Fair Value | 10,647 | 12,510
short-term investments amortized cost | 3,147 | 4,349
Premium Receivable, Allowance for Credit Loss | 46 | 44
Valuation allowance for uncollectible reinsurance | $ 329 | $ 314
Common Shares, shares issued | shares | 474,021,114 | 477,605,264
Common Shares, shares outstanding | shares | 426,572,612 | 450,732,625
Treasury Stock, Shares | shares | 47,448,502 | 26,872,639

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