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Consolidated Balance Sheets (Parenthetical) $ in Millions | Mar. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) shares
--- | --- | ---
Statement of Financial Position [Abstract] |  |
Available for sale, at amortized cost | $ 80,959 | $ 82,580
Debt Securities, Available-for-sale, Allowance for Credit Loss | 176 | 0
Held to maturity, at Fair Value | 12,471 | 13,005
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 45 | 0
short-term investments amortized cost | 3,582 | 4,291
Reinsurance Recoverable, Allowance for Credit Loss | $ 305 | $ 316
Common Shares, shares issued | shares | 479,783,864 | 479,783,864
Common Shares, shares outstanding | shares | 451,367,782 | 451,971,567
Common Shares in treasury, shares | shares | 28,416,082 | 27,812,297

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