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Consolidated Balance Sheets (Parenthetical) $ in Millions | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) shares
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Statement of Financial Position [Abstract] |  |
Fixed maturities available for sale, at amortized cost | $ 77,835 | $ 79,536
Fixed maturities available for sale, hybrid financial instruments | 5 | 2
Held-to-maturity Securities, Fair Value | 14,474 | 10,670
Equity securities, at cost | 737 | 706
Other investments, cost | $ 4,417 | $ 4,270
Common Shares, shares issued | shares | 479,783,864 | 479,783,864
Common Shares, shares outstanding | shares | 463,833,179 | 465,968,716
Common Shares in treasury, shares | shares | 15,950,685 | 13,815,148

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- Definition Fair value of investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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