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Consolidated Balance Sheets (Parenthetical) $ in Millions | Mar. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) shares
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Statement of Financial Position [Abstract] |  |
Available for sale, at amortized cost | $ 79,957 | $ 79,536
Fixed maturities available for sale, hybrid financial instruments | 2 | 2
Held to maturity, at Fair Value | 10,604 | 10,670
Equity securities, at cost | 699 | 706
Other investments, cost | $ 4,271 | $ 4,270
Common Shares, shares issued | shares | 479,783,864 | 479,783,864
Common Shares, shares outstanding | shares | 467,223,019 | 465,968,716
Common Shares in treasury, shares | shares | 12,560,845 | 13,815,148

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