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Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Investments held-to-maturity, fair value | $ 2,690 | $ 2,674
Short-term investments held as available-for-sale, amortized cost | 6,647 | 6,122
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 | 277,804,712 | 277,405,039
Accumulated other comprehensive loss, net of deferred tax | 33 | 21
Treasury stock, shares | 84,837,343 | 81,733,530
Non Variable Interest Entity [Member] |  |
Fixed-maturity securities held as available-for-sale, amortized cost | 3,999 | 4,347
Investments pledged as collateral, amortized cost | 396 | 489
Short-term investments held as available-for-sale, amortized cost | 1,942 | 662
Other investments, fair value | 13 | 12
Property and equipment, accumulated depreciation | 145 | 146
Medium-term notes, financial instruments carried at fair value | 188 | 165
Variable Interest Entity Primary Beneficiary [Member] |  |
Investments held-to-maturity, fair value | 2,690 | 2,674
Fixed-maturity securities held as available-for-sale, amortized cost | 321 | 637
Variable interest entity notes, financial instruments carried at fair value | $ 2,590 | $ 3,659

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