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Restructuring Programs - Additional Information (Detail) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended 14 Months Ended 36 Months Ended
May. 06, 2014
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2012
Jun. 30, 2015
Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]                
Approved restructuring program cost related to capital expenditure       $ 790,000,000 $ 724,000,000      
2014-2018 Restructuring Program                
Restructuring Cost and Reserve [Line Items]                
Approved restructuring program cost $ 3,500,000,000              
Restructuring and related cost, cost incurred   $ 182,000,000 $ 10,000,000 406,000,000 10,000,000   $ 787,000,000 [1]  
Restructuring charges   135,000,000 1,000,000 297,000,000 1,000,000   571,000,000 [1]  
Cash spent   66,000,000 1,000,000 105,000,000 1,000,000      
Non-cash asset write-downs   62,000,000   140,000,000        
Restructuring reserve   267,000,000   267,000,000     267,000,000 $ 224,000,000
Implementation costs   47,000,000 9,000,000 109,000,000 9,000,000   216,000,000 [1]  
2014-2018 Restructuring Program | Selling, general and administrative expenses                
Restructuring Cost and Reserve [Line Items]                
Implementation costs   47,000,000 9,000,000 109,000,000 9,000,000      
2014-2018 Restructuring Program | Other Current Liabilities                
Restructuring Cost and Reserve [Line Items]                
Restructuring reserve   237,000,000   237,000,000     237,000,000  
2014-2018 Restructuring Program | Other Long Term Liabilities                
Restructuring Cost and Reserve [Line Items]                
Restructuring reserve   30,000,000   30,000,000     30,000,000  
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     73,000,000   139,000,000     899,000,000 [2]
Restructuring charges     54,000,000   96,000,000     729,000,000 [2]
Cash spent   24,000,000 38,000,000 43,000,000 66,000,000      
Non-cash asset write-downs     11,000,000 (1,000,000) 24,000,000      
Restructuring reserve   77,000,000   77,000,000     77,000,000 128,000,000
Implementation costs     19,000,000   43,000,000     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   1,000,000   3,000,000        
2012-2014 Restructuring Program | Selling, general and administrative expenses                
Restructuring Cost and Reserve [Line Items]                
Implementation costs     $ 19,000,000   $ 43,000,000      
2012-2014 Restructuring Program | Other Current Liabilities                
Restructuring Cost and Reserve [Line Items]                
Restructuring reserve   63,000,000   63,000,000     63,000,000  
2012-2014 Restructuring Program | Other Long Term Liabilities                
Restructuring Cost and Reserve [Line Items]                
Restructuring reserve   $ 14,000,000   $ 14,000,000     $ 14,000,000  
[1] Includes all charges recorded since program inception on May 6, 2014 through June 30, 2015.
[2] Includes all charges recorded since program inception in 2012 through conclusion on December 31, 2014.