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Accumulated Other Comprehensive Income (loss) - Reclassifications from Accumulated Other Comprehensive Income (Loss) to Income Statement (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Amortization of defined benefit pension:        
Accumulated other comprehensive income, defined benefit pension, Tax Expense $ 38 $ 16 $ 91 $ 54
Accumulated other comprehensive income, defined benefit pension net of tax 101 14 222 (28)
Amount Reclassified [Member] | Accumulated Defined Benefit Plans Adjustment [Member]
        
Amortization of defined benefit pension:        
Accumulated other comprehensive income, defined benefit pension, Tax Expense            
Accumulated other comprehensive income, defined benefit pension net of tax 5 3 14 11
Interest rate swaps Tax Expenses            
Interest rate swaps Net of Taxes 0 1 1 1
Selling, General & Administrative Expense [Member] | Amount Reclassified [Member] | Accumulated Defined Benefit Plans Adjustment [Member]
        
Amortization of defined benefit pension:        
Accumulated other comprehensive income, defined benefit pension, Selling, General and Administrative Expense 5 3 14 11
Interest expense [Member] | Amount Reclassified [Member] | Accumulated Defined Benefit Plans Adjustment [Member]
        
Amortization of defined benefit pension:        
Interest rate swaps    $ 1 $ 1 $ 1