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Equity, Reclassification Out of Accumulated Other Comprehensive Income (Loss) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss)        
Net actuarial loss $ 14 $ 8 $ 43 $ 25
Prior service credit (9) (5) (24) (15)
Total before tax 447 1,237 2,180 2,182
Tax benefit (expense) (123) (564) (739) (1,111)
Net of tax 324 673 1,441 1,071
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member]
        
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss)        
Net of tax 1   (11)  
Defined Benefit Plans Items [Member] | Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member]
        
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss)        
Net actuarial loss (14) [1]   (43) [1]  
Prior service credit 9 [1]   24 [1]  
Total before tax (5)   (19)  
Tax benefit (expense) 2   7  
Net of tax (3)   (12)  
Gains (Losses) on Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member]
        
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss)        
Total before tax 6   1  
Tax benefit (expense) (2)   0  
Net of tax 4   1  
Gains (Losses) on Cash Flow Hedges [Member] | Commodity Contract [Member] | Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member]
        
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss)        
Cost of sales $ 6   $ 1  
[1] These accumulated other comprehensive income (loss) components are included in the computation of net periodic benefit cost, as further discussed in Note 8. Net periodic benefit cost is reflected in operating expenses and general and administrative expenses.