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Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Fixed-maturity securities held as available-for-sale, amortized cost | $ 6,443 | $ 6,122
Investments held-to-maturity, fair value | 2,566 | 2,674
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 | 277,804,062 | 277,405,039
Accumulated other comprehensive loss, net of tax | 30 | 21
Treasury stock, shares | 85,551,418 | 81,733,530
Non Variable Interest Entity [Member] |  |
Fixed-maturity securities held as available-for-sale, amortized cost | 4,516 | 4,347
Investments pledged as collateral, amortized cost | 407 | 489
Short-term investments held as available-for-sale, amortized cost | 1,377 | 662
Other investments, fair value | 10 | 12
Property and equipment, accumulated depreciation | 87 | 146
Medium-term notes, financial instruments carried at fair value | 204 | 165
Variable Interest Entity Primary Beneficiary [Member] |  |
Fixed-maturity securities held as available-for-sale, amortized cost | 156 | 637
Investments held-to-maturity, fair value | 2,566 | 2,674
Variable interest entity notes, financial instruments carried at fair value | $ 2,426 | $ 3,659

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