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Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Fixed-maturity securities held as available-for-sale, amortized cost | $ 6,815 | $ 6,824
Investments held-to-maturity, fair value | 2,695 | 2,651
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 | 281,291,579 | 277,812,430
Accumulated other comprehensive income (loss), taxes | 16 | 54
Treasury stock, shares | 86,086,648 | 85,562,546
Non Variable Interest Entity [Member] |  |
Fixed-maturity securities held as available-for-sale, amortized cost | 5,173 | 5,064
Investments pledged as collateral, amortized cost | 329 | 483
Short-term investments held as available-for-sale, amortized cost | 1,318 | 1,203
Other investments, fair value | 12 | 11
Medium-term notes, financial instruments carried at fair value | 215 | 203
Variable Interest Entity Primary Beneficiary [Member] |  |
Fixed-maturity securities held as available-for-sale, amortized cost | 35 | 136
Investments held-to-maturity, fair value | 2,695 | 2,651
Variable interest entity notes, financial instruments carried at fair value | $ 2,194 | $ 2,356

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