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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