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Reclassifications from Accumulated Other Comprehensive Income - Other Comprehensive Income Activity Net of Tax (Detail) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2013
Accumulated Other Comprehensive Income [Roll Forward]  
Beginning Balance $ (3,268) [1]
Other comprehensive income (loss) before reclassifications 0 [1]
Amounts reclassified from AOCI (b) 210 [1],[2]
Net current-period other comprehensive income 210 [1]
Ending Balance (3,058) [1]
Pension and Other Benefit Items
 
Accumulated Other Comprehensive Income [Roll Forward]  
Beginning Balance (3,613) [1]
Other comprehensive income (loss) before reclassifications (13) [1]
Amounts reclassified from AOCI (b) 210 [1],[2]
Net current-period other comprehensive income 197 [1]
Ending Balance (3,416) [1]
Foreign Currency Items
 
Accumulated Other Comprehensive Income [Roll Forward]  
Beginning Balance 345 [1]
Other comprehensive income (loss) before reclassifications 13 [1]
Amounts reclassified from AOCI (b) 0 [1],[2]
Net current-period other comprehensive income 13 [1]
Ending Balance $ 358 [1]
[1] All amounts are net of tax. Amounts in parentheses indicate debits.
[2] See table below for further details.