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Derivatives and Other Hedging Instruments (Effect of Cash Flow Hedges on Accumulated Other Comprehensive Income (Loss)) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Derivative [Line Items]      
Additions and revaluations of derivatives designated as cash flow hedges, after-tax $ 2 $ 5 $ (19)
Clearance of hedge results to earnings, after-tax (37) 60 56
Portion of ending balance expected to be reclassified into earnings over the next twelve months, after-tax 9    
Cash Flow Hedging [Member]
     
Derivative [Line Items]      
Beginning balance, after-tax 41 (31)  
Additions and revaluations of derivatives designated as cash flow hedges, after-tax (1) 12  
Clearance of hedge results to earnings, after-tax (37) 60  
Ending balance, after-tax $ 3 $ 41