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Consolidated Balance Sheets (Parenthetical) (USD $)
In Millions, except Share data
Jun. 30, 2011
Dec. 31, 2010
Short-term investments held as available-for-sale, amortized cost $ 11,249 $ 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 274,922,351 274,719,578
Accumulated other comprehensive loss, deferred tax 122 229
Treasury stock, shares 78,141,872 74,973,978
Non Variable Interest Entities [Member]
    
Fixed-maturity securities held as available-for-sale, amortized cost 8,468 9,679
Investments pledged as collateral, amortized cost 582 548
Short-term investments held as available-for-sale, amortized cost 1,761 2,073
Other investments, fair value 158 186
Property and equipment, accumulated depreciation 136 135
Medium-term notes, financial instruments carried at fair value 206 116
Variable Interest Entity, Primary Beneficiary [Member]
    
Investments held-to-maturity, fair value 3,703 3,760
Fixed-maturity securities held as available-for-sale, amortized cost 279 338
Variable interest entity notes, financial instruments carried at fair value $ 6,539 $ 6,680