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Financial Instruments (Narrative) (Details) (USD $)
In Millions
9 Months Ended12 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Dec. 31, 2010
Financial Instruments [Abstract]   
Additional long-term investments, no market prices$ 34 $ 39
Available for sale securities, carried at market value20 23
Gross unrealized gains (pre-tax) on available for sale securities included in accumulated other comprehensive income7 8
Gross unrealized gains on fiduciary assets during period1 7
Gross unrealized losses (pre-tax) on fiduciary assets during period58 
Fair Value on Senior Notes257[1]  
Senior Notes due 2014, adjusted by the fair value of interest rate swap$ 250  
[1]Included in long term debt in the consolidated balance sheets.