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Debt (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Debt Instrument [Line Items]      
Interest Costs Incurred $ 625 $ 683 $ 729
Interest Paid 614 626 670
Available amount under credit facility 4,600    
Collateralizing debt 10,409 12,371  
Customer Financing Asset Used For Collateralizing Debt 461    
7.95% Due August 15, 2024 [Member]
     
Debt Instrument [Line Items]      
Debt instrument, face amount 300    
Debt maturity date Aug. 15, 2024    
Collateralized Debt Obligations [Member]
     
Debt Instrument [Line Items]      
Collateralizing debt 277    
364-Day Revolving Credit Facility [Member]
     
Debt Instrument [Line Items]      
Available amount under credit facility 2,300    
Maturity date of credit line agreements Nov. 30, 2013    
Five-Year Credit Facility [Member]
     
Debt Instrument [Line Items]      
Available amount under credit facility $ 2,300    
Maturity date of credit line agreements Nov. 30, 2017