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Financial Instruments (Narrative) (Details) (USD $)
In Millions
6 Months Ended 12 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Dec. 31, 2010
Financial Instruments      
Additional long-term investments, no market prices $ 35   $ 39
Available for sale securities, carried at market value 20   23
Gross unrealized gains (pre-tax) on available for sale securities included in accumulated other comprehensive income 7   8
Gross unrealized gains on fiduciary assets during period 3   7
Gross unrealized losses (pre-tax) on fiduciary assets during period 4 6  
Senior Notes due 2014 255 [1]    
Senior notes due 2014, adjusted by the fair value of the interest rate swap $ 250    
[1] Included in long term debt in the consolidated balance sheets.