Quarterly report pursuant to Section 13 or 15(d)

Investments (Details 3)

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Investments (Details 3) (USD $)
In Millions
Sep. 30, 2011
Dec. 31, 2010
Held-to-maturity securities, by type    
Held-to-maturity securities, cost $ 325  
Held-to-maturity Securities, Fair Value 325  
Bank and corporate debt
   
Held-to-maturity securities, by type    
Held-to-maturity securities, cost 325 111
Held-to-maturity Securities, Fair Value 325 111
Held-to-maturity Securities Unrealized Losses, Gross 0 0
Held-to-maturity Securities Unrealized Gains, Gross $ 0 $ 0