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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Fixed-maturity securities held as available-for-sale, amortized cost $ 6,437 $ 6,509
Investments held-to-maturity, fair value $ 2,580 $ 2,632
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 281,744,542 281,352,782
Accumulated other comprehensive income (loss), taxes $ 39 $ 7
Treasury stock, shares 109,765,833 89,409,887
Non Variable Interest Entity [Member]    
Fixed-maturity securities held as available-for-sale, amortized cost $ 5,096 $ 5,036
Investments pledged as collateral, amortized cost 273 441
Short-term investments held as available-for-sale, amortized cost 1,106 1,069
Other investments, fair value 13 13
Medium-term notes, financial instruments carried at fair value 166 197
Variable Interest Entity Primary Beneficiary [Member]    
Investments held-to-maturity, fair value 2,580 2,632
Variable interest entity notes, financial instruments carried at fair value $ 2,581 $ 2,047