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Consolidated Balance Sheets (Parenthetical) $ in Millions	Jun. 30, 2018 USD ($) shares	Dec. 31, 2017 USD ($) shares
Statement of Financial Position [Abstract]
Available for sale, at amortized cost	$ 78,546	$ 77,835
Fixed maturities available for sale, hybrid financial instruments	9	5
Held to maturity, at Fair Value	13,665	14,474
Equity securities, at cost	933	737
Other investments, cost	$ 5,259	$ 4,417
Common Shares, shares issued | shares	479,783,864	479,783,864
Common Shares, shares outstanding | shares	463,502,164	463,833,179
Common Shares in treasury, shares | shares	16,281,700	15,950,685

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This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Fair value of investments in debt securities classified as held-to-maturity.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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