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Consolidated Statements of Financial Position (Parenthetical) (USD $)
In Millions, except Per Share data
Sep. 30, 2011
Dec. 31, 2010
Fixed maturities, available-for-sale$ 49,069.5$ 48,636.3
Fixed maturities, trading1,278.61,120.3
Equity securities, trading360.3316.9
Other investments3,202.82,641.6
Cash and cash equivalents1,434.21,877.4
Other liabilities6,265.66,143.5
Common stock, par value (in dollars per share)$ 0.01$ 0.01
Common stock, authorized (in shares)2,500.02,500.0
Common stock, issued (in shares)450.2448.5
Common stock, outstanding (in shares)305.1320.4
Treasury stock (in shares)145.1128.1
Aggregate consolidated variable interest entities
  
Fixed maturities, available-for-sale225.7257.9
Fixed maturities, trading135.0131.4
Equity securities, trading164.8158.6
Other investments105.6128.7
Other investments measured at fair value under fair value option104.5128.3
Cash and cash equivalents304.9100.0
Other liabilities515.7433.6
Other liabilities measured at fair value under fair value option$ 90.6$ 114.5
Series A
  
Preferred stock, par value (in dollars per share)$ 0.01$ 0.01
Preferred stock, liquidation preference (in dollars per share)$ 100$ 100
Preferred stock, authorized (in shares)3.03.0
Preferred stock, issued (in shares)3.03.0
Preferred stock, outstanding (in shares)3.03.0
Series B
  
Preferred stock, par value (in dollars per share)$ 0.01$ 0.01
Preferred stock, liquidation preference (in dollars per share)$ 25$ 25
Preferred stock, authorized (in shares)10.010.0
Preferred stock, issued (in shares)10.010.0
Preferred stock, outstanding (in shares)10.010.0