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Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified | Mar. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Short-term investments held as available-for-sale, amortized cost | $ 8,692 | $ 9,025
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 | 275,488,914 | 274,896,162
Accumulated other comprehensive loss, deferred tax | 33 | 105
Treasury stock, shares | 81,750,127 | 81,752,966
Non Variable Interest Entities [Member] |  |
Fixed-maturity securities held as available-for-sale, amortized cost | 5,529 | 6,259
Investments pledged as collateral, amortized cost | 533 | 642
Short-term investments held as available-for-sale, amortized cost | 1,711 | 1,577
Other investments, fair value | 57 | 96
Property and equipment, accumulated depreciation | 141 | 139
Medium-term notes, financial instruments carried at fair value | 174 | 165
Variable Interest Entity [Member] |  |
Investments held-to-maturity, fair value | 2,871 | 3,489
Fixed-maturity securities held as available-for-sale, amortized cost | 886 | 473
Variable interest entity notes, financial instruments carried at fair value | $ 4,761 | $ 4,754

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