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Consolidated Balance Sheets (Parenthetical) $ in Millions | Mar. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares
--- | --- | ---
Statement of Financial Position [Abstract] |  |
Available for sale, at amortized cost | $ 79,624 | $ 79,323
Fixed maturities available for sale, hybrid financial instruments | 8 | 9
Held to maturity, at Fair Value | 13,240 | 13,259
Equity securities, at cost | 0 |
Other investments, cost | $ 0 |
Common Shares, shares issued | shares | 479,783,864 | 479,783,864
Common Shares, shares outstanding | shares | 458,179,205 | 459,203,378
Common Shares in treasury, shares | shares | 21,604,659 | 20,580,486

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