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Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data | Sep. 30, 2011 | Dec. 31, 2010
--- | --- | ---
Short-term investments held as available-for-sale, amortized cost | $ 10,754 | $ 12,822
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 | 274,913,262 | 274,719,578
Accumulated other comprehensive loss, deferred tax | 94 | 229
Treasury stock, shares | 81,755,455 | 74,973,978
Non Variable Interest Entities [Member] |  |
Fixed-maturity securities held as available-for-sale, amortized cost | 7,874 | 9,679
Investments pledged as collateral, amortized cost | 666 | 548
Short-term investments held as available-for-sale, amortized cost | 1,486 | 2,073
Other investments, fair value | 139 | 186
Property and equipment, accumulated depreciation | 138 | 135
Medium-term notes, financial instruments carried at fair value | 128 | 116
Variable Interest Entity, Primary Beneficiary [Member] |  |
Investments held-to-maturity, fair value | 3,492 | 3,760
Fixed-maturity securities held as available-for-sale, amortized cost | 574 | 338
Variable interest entity notes, financial instruments carried at fair value | $ 5,123 | $ 6,680

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