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Consolidated Balance Sheets (Parenthetical) $ in Millions | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($) shares
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Statement of Financial Position [Abstract] |  |
Fixed maturities available for sale, at amortized cost | $ 79,323 | $ 77,835
Fixed maturities available for sale, hybrid financial instruments | 9 | 5
Debt Securities, Held-to-maturity, Fair Value | 13,259 | 14,474
Equity Securities, FV-NI, Cost | 770 |
Equity securities, at cost |  | 737
Other investments, cost | $ 5,277 | $ 4,417
Common Shares, shares issued | shares | 479,783,864 | 479,783,864
Common Shares, shares outstanding | shares | 459,203,378 | 463,833,179
Common Shares in treasury, shares | shares | 20,580,486 | 15,950,685

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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