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Consolidated Balance Sheets (Parenthetical) $ in Millions | Sep. 30, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares
--- | --- | ---
Statement of Financial Position [Abstract] |  |
Available for sale, at amortized cost | $ 82,036 | $ 79,323
Fixed maturities available for sale, hybrid financial instruments | 5 | 9
Held to maturity, at Fair Value | 13,096 | 13,259
short-term investments amortized cost | $ 2,838 | $ 3,016
Common Shares, shares issued | shares | 479,783,864 | 479,783,864
Common Shares, shares outstanding | shares | 453,533,642 | 459,203,378
Common Shares in treasury, shares | shares | 26,250,222 | 20,580,486

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