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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Fixed-maturity securities held as available-for-sale, amortized cost | $ 5,450 | $ 6,160
Preferred stock, par value | $ 1 | $ 1
Preferred stock, authorized shares | 10,000,000 | 10,000,000
Preferred stock, issued | 0 | 0
Preferred stock, outstanding | 0 | 0
Common stock, par value | $ 1 | $ 1
Common stock, authorized shares | 400,000,000 | 400,000,000
Common stock, issued shares | 283,989,999 | 281,833,618
Accumulated other comprehensive income (loss), taxes | $ 37 | $ 51
Treasury stock, shares | 148,789,168 | 130,303,241
Non Variable Interest Entity [Member] |  |
Fixed-maturity securities held as available-for-sale, amortized cost | $ 4,713 | $ 5,483
Investments pledged as collateral, amortized cost | 234 | 322
Short-term investments held as available-for-sale, amortized cost | 552 | 392
Other investments, fair value | 5 | 13
Medium-term notes, financial instruments carried at fair value | 101 | 161
Variable Interest Entity Primary Beneficiary [Member] |  |
Investments held-to-maturity, fair value | 876 | 2,401
Variable interest entity notes, financial instruments carried at fair value | $ 1,351 | $ 2,362

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