Quarterly report pursuant to Section 13 or 15(d)

Investments (Details 5)

v2.3.0.15
Investments (Details 5) (USD $)
In Millions
Sep. 30, 2011
Dec. 31, 2010
Investments [Abstracts]    
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Amortized Cost Basis $ 2  
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value 2  
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Amortized Cost Basis 72  
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value 73  
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis 11  
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value 10  
Held-to-maturity securities, within 1 year, amortized cost 325  
Held-to-maturity Securities, Debt Maturities, within One Year, Fair Value 325  
Cost Method Investments [Abstract]    
Cost-method Investments, Aggregate Carrying Amount 161 160
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount 0  
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Fair Value 0  
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount 0  
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Fair Value 0  
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount 0  
Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value 0  
Available-for-sale Securities, Debt Maturities, within One Year, Amortized Cost Basis 0  
Available-for-sale Securities, Debt Maturities, within One Year, Fair Value 0  
Held-to-maturity securities, by type    
Held-to-maturity Securities, Current 325  
Held-to-maturity Securities, Fair Value 325  
Equity Securities [Member]
   
Held-to-maturity securities, by type    
Held-to-maturity Securities, Current 0  
Held-to-maturity Securities, Fair Value $ 0