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Reclassifications from Accumulated Other Comprehensive Income - Defined Benefit Plan In Other Comprehensive Income (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Amortization of pension and other benefit items        
(Loss) income before income taxes and noncontrolling interests $ (1,787,000,000) $ 17,000,000 $ (1,928,000,000) $ 65,000,000
Tax benefit (4,000,000) 27,000,000 (14,000,000) (139,000,000)
Net (loss) income (1,791,000,000) 44,000,000 (1,942,000,000) (74,000,000)
Pension and Other Benefit Items | Reclassification out of Accumulated Other Comprehensive Income [Member]
       
Amortization of pension and other benefit items        
Prior service costs (3,000,000) [1],[2]   (8,000,000) [1],[2]  
Actuarial gains/(losses) (100,000,000) [1],[2]   (298,000,000) [1],[2]  
(Loss) income before income taxes and noncontrolling interests (103,000,000) [2]   (306,000,000) [2]  
Tax benefit 29,000,000 [2]   96,000,000 [2]  
Net (loss) income $ (74,000,000) [2]   $ (210,000,000) [2]  
[1] These AOCI components are included in the computation of net periodic benefit cost (see Note 6 for additional details).
[2] Amounts in parentheses indicate debits to income/loss.