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Restructuring Programs - Additional Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended 17 Months Ended 36 Months Ended
May. 06, 2014
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2012
Sep. 30, 2015
Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]                
Approved restructuring program cost related to capital expenditure       $ 1,178,000,000 $ 1,129,000,000      
2014-2018 Restructuring Program                
Restructuring Cost and Reserve [Line Items]                
Approved restructuring program cost $ 3,500,000,000              
Restructuring and related cost, cost incurred   $ 221,000,000 $ 67,000,000 627,000,000 77,000,000   $ 1,008,000,000 [1]  
Restructuring charges   146,000,000 25,000,000 442,000,000 26,000,000   717,000,000 [1]  
Cash spent   51,000,000 25,000,000 156,000,000 26,000,000      
Non-cash asset write-downs   56,000,000   196,000,000        
Restructuring reserve   299,000,000   299,000,000     299,000,000 $ 224,000,000
Implementation costs   75,000,000 42,000,000 185,000,000 51,000,000   291,000,000 [1]  
2014-2018 Restructuring Program | Selling, general and administrative expenses                
Restructuring Cost and Reserve [Line Items]                
Implementation costs   75,000,000 42,000,000 185,000,000 51,000,000      
2014-2018 Restructuring Program | Other current liabilities                
Restructuring Cost and Reserve [Line Items]                
Restructuring reserve   267,000,000   267,000,000     267,000,000  
2014-2018 Restructuring Program | Other Noncurrent liabilities                
Restructuring Cost and Reserve [Line Items]                
Restructuring reserve   32,000,000   32,000,000     32,000,000  
2014-2018 Restructuring Program | Maximum | Scenario, Forecast                
Restructuring Cost and Reserve [Line Items]                
Approved restructuring program cost related to capital expenditure 2,200,000,000              
2014-2018 Restructuring Program | Cash Expense                
Restructuring Cost and Reserve [Line Items]                
Approved restructuring program cost 2,500,000,000              
2014-2018 Restructuring Program | Non Cash Expense                
Restructuring Cost and Reserve [Line Items]                
Approved restructuring program cost $ 1,000,000,000              
2012-2014 Restructuring Program                
Restructuring Cost and Reserve [Line Items]                
Approved restructuring program cost               925,000,000
Restructuring and related cost, cost incurred     186,000,000   325,000,000     899,000,000 [2]
Restructuring charges     163,000,000   259,000,000     729,000,000 [2]
Cash spent   14,000,000 44,000,000 57,000,000 110,000,000      
Non-cash asset write-downs     53,000,000   77,000,000      
Restructuring reserve   62,000,000   62,000,000     62,000,000 128,000,000
Implementation costs     23,000,000   66,000,000     170,000,000 [2]
Restructuring and related activities, authorized amount           $ 1,500,000,000    
Restructuring and related cost, cost incurred               $ 899,000,000
Reversal to restructuring charges       3,000,000        
2012-2014 Restructuring Program | Selling, general and administrative expenses                
Restructuring Cost and Reserve [Line Items]                
Implementation costs     $ 23,000,000   $ 66,000,000      
2012-2014 Restructuring Program | Other current liabilities                
Restructuring Cost and Reserve [Line Items]                
Restructuring reserve   47,000,000   47,000,000     47,000,000  
2012-2014 Restructuring Program | Other Noncurrent liabilities                
Restructuring Cost and Reserve [Line Items]                
Restructuring reserve   $ 15,000,000   $ 15,000,000     $ 15,000,000  
[1] Includes all charges recorded since program inception on May 6, 2014 through September 30, 2015.
[2] Includes all charges recorded since program inception in 2012 through conclusion on December 31, 2014.