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Fair Value Measurements Fair Values And Related Carrying Values of Financial Instruments (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Accounts receivable, net $ 6,406 $ 5,608
Carrying Amount [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Accounts receivable, net 6,406 5,608
Debt Excluding Capital Lease Obligations, Carrying Value (9,436) (10,231)
Fair Value [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Accounts receivable, Fair value 6,383 5,642
Debt, excluding capital lease obligations, Fair value (10,946) (12,269)
Level 2 [Member] | Fair Value [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Accounts receivable, Fair value 6,383 5,642
Debt, excluding capital lease obligations, Fair value (10,899) (12,221)
Level 3 [Member] | Fair Value [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt, excluding capital lease obligations, Fair value (47) (48)
Notes Receivable [Member] | Carrying Amount [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable, Carrying value 592 571
Notes Receivable [Member] | Fair Value [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable, Fair value 645 632
Notes Receivable [Member] | Level 2 [Member] | Fair Value [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable, Fair value $ 645 $ 632