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Investments In Marketable Securities (Details) (USD $)
In Millions
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Dec. 31, 2010
Debt securities:     
Unsecured debentures$ 498 $ 498 $ 723
Certificates of deposit447 447 876
Government debt securities40 40 47
Other debt securities40 40 42
Subtotal1,025 1,025 1,688
Equity securities:     
Mutual funds56 56 62
Common stock2 2 7
Subtotal58 58 69
Total available-for-sale1,083 1,083 1,757
Equity securities:     
Mutual funds10 10 10
Total trading10 10 10
Total marketable securities1,093 1,093 1,767
Footnotes to Marketable Securities Detail Table [Abstract]     
Amortized cost of commmon stock available-for-sale4 4 6
Debt securities with future maturities greater than ten years40 40  
Gain Loss On Marketable Securities     
Losses included in earnings that relate to tradingsecurities held at the reporting date(2)(1)(1)0 
Unrealized losses on available-for-sale securities included in other comprehensive income(1)0(4)(10) 
Proceeds from sales of available-for-sale securities1,1341,4204,2184,644 
Gross realized gains on sales1052 
Level 1
     
Debt securities:     
Unsecured debentures0 0 0
Certificates of deposit0 0 0
Government debt securities0 0 0
Other debt securities0 0 0
Subtotal0 0 0
Equity securities:     
Mutual funds0 0 1
Common stock2 2 7
Subtotal2 2 8
Total available-for-sale2 2 8
Equity securities:     
Mutual funds10 10 10
Total trading10 10 10
Total marketable securities12 12 18
Level 2
     
Debt securities:     
Unsecured debentures498 498 723
Certificates of deposit447 447 876
Government debt securities40 40 47
Other debt securities0 0 0
Subtotal985 985 1,646
Equity securities:     
Mutual funds56 56 61
Common stock0 0 0
Subtotal56 56 61
Total available-for-sale1,041 1,041 1,707
Equity securities:     
Mutual funds0 0 0
Total trading0 0 0
Total marketable securities1,041 1,041 1,707
Level 3
     
Debt securities:     
Unsecured debentures0 0 0
Certificates of deposit0 0 0
Government debt securities0 0 0
Other debt securities40 40 42
Subtotal40 40 42
Equity securities:     
Mutual funds0 0 0
Common stock0 0 0
Subtotal0 0 0
Total available-for-sale40 40 42
Equity securities:     
Mutual funds0 0 0
Total trading0 0 0
Total marketable securities$ 40 $ 40 $ 42