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Investments In Marketable Securities (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Debt securities:      
Unsecured debentures $ 448 $ 665  
Certificates of deposit 143 576  
Government debt securities 34 31  
Other 0 0  
Subtotal 625 1,272  
Equity securities:      
Mutual funds 56 67  
Common stock 0 1  
Subtotal 56 68  
Total available-for-sale 681 1,340  
Equity securities:      
Mutual funds 12 12  
Total trading 12 12  
TOTAL 693 1,352  
Held-to-maturity Securities 3 4  
Total marketable securities 696 1,356  
Footnotes to Marketable Securities Detail Table [Abstract]      
Amortized cost of commmon stock available-for-sale 0 4  
Gain Loss On Marketable Securities      
Gains included in earnings that relate to trading securities held at the reporting date (1) 1 0
Unrealized gains (losses) on available-for-sale securities included in other comprehensive income 1 2 2
Gains reclassified out of other comprehensive income into earnings (1) 0 0
Proceeds from sales of available-for-sale securities 6,489 6,119 5,852
Gross realized gains on sales 2 3 2
Level 1
      
Debt securities:      
Unsecured debentures 0 0  
Certificates of deposit 0 0  
Government debt securities 0 0  
Other 0 0  
Subtotal 0 0  
Equity securities:      
Mutual funds 0 0  
Common stock 0 1  
Subtotal 0 1  
Total available-for-sale 0 1  
Equity securities:      
Mutual funds 12 12  
Total trading 12 12  
TOTAL 12 13  
Level 2
      
Debt securities:      
Unsecured debentures 448 665  
Certificates of deposit 143 576  
Government debt securities 34 31  
Other 0 0  
Subtotal 625 1,272  
Equity securities:      
Mutual funds 56 67  
Common stock 0 0  
Subtotal 56 67  
Total available-for-sale 681 1,339  
Equity securities:      
Mutual funds 0 0  
Total trading 0 0  
TOTAL 681 1,339  
Level 3
      
Debt securities:      
Unsecured debentures 0 0  
Certificates of deposit 0 0  
Government debt securities 0 0  
Other 0 0  
Subtotal 0 0  
Equity securities:      
Mutual funds 0 0  
Common stock 0 0  
Subtotal 0 0  
Total available-for-sale 0 0  
Equity securities:      
Mutual funds 0 0  
Total trading 0 0  
TOTAL 0 0  
Gain Loss On Marketable Securities      
Proceeds from sales of available-for-sale securities   $ 42