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Restructuring Programs - Additional Information (Detail) - USD ($)
 12 Months Ended 20 Months Ended 36 Months Ended
May. 06, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2015
Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]              
Approved restructuring program cost related to capital expenditure   $ 1,514,000,000 $ 1,642,000,000 $ 1,622,000,000      
Severance and Related Costs              
Restructuring Cost and Reserve [Line Items]              
Restructuring charges     73,000,000        
2012-2014 Restructuring Program              
Restructuring Cost and Reserve [Line Items]              
Approved restructuring program cost     925,000,000       $ 925,000,000
Restructuring and related cost, cost incurred     459,000,000 330,000,000     899,000,000 [1]
Restructuring charges   (4,000,000) 360,000,000 267,000,000     729,000,000 [1]
Cash spent   66,000,000 130,000,000        
Non-cash asset write-downs   4,000,000 161,000,000        
Restructuring reserve   47,000,000 128,000,000 68,000,000   $ 47,000,000 128,000,000
Implementation costs     99,000,000 63,000,000     170,000,000 [1]
Restructuring and related activities, authorized amount         $ 1,500,000,000    
Restructuring and related cost, cost incurred     899,000,000       899,000,000
Reversal to restructuring charges   4,000,000          
2012-2014 Restructuring Program | Selling, general and administrative expenses              
Restructuring Cost and Reserve [Line Items]              
Implementation costs     99,000,000 63,000,000      
2012-2014 Restructuring Program | Other current liabilities              
Restructuring Cost and Reserve [Line Items]              
Restructuring reserve   46,000,000       46,000,000  
2012-2014 Restructuring Program | Other liabilities              
Restructuring Cost and Reserve [Line Items]              
Restructuring reserve   1,000,000       1,000,000  
2012-2014 Restructuring Program | Severance and Related Costs              
Restructuring Cost and Reserve [Line Items]              
Restructuring charges   (4,000,000) 201,000,000        
Cash spent   66,000,000 130,000,000        
Non-cash asset write-downs   4,000,000 2,000,000        
Restructuring reserve   47,000,000 128,000,000 $ 68,000,000   47,000,000 128,000,000
2014-2018 Restructuring Program              
Restructuring Cost and Reserve [Line Items]              
Approved restructuring program cost $ 3,500,000,000            
Restructuring and related cost, cost incurred   1,002,000,000 381,000,000     1,383,000,000 [2]  
Restructuring charges   711,000,000 274,000,000     985,000,000 [2]  
Cash spent   243,000,000 17,000,000        
Non-cash asset write-downs   273,000,000 28,000,000        
Restructuring reserve   395,000,000 224,000,000     395,000,000 224,000,000
Implementation costs   291,000,000 107,000,000     398,000,000 [2]  
2014-2018 Restructuring Program | Selling, general and administrative expenses              
Restructuring Cost and Reserve [Line Items]              
Implementation costs   291,000,000 107,000,000        
2014-2018 Restructuring Program | Other current liabilities              
Restructuring Cost and Reserve [Line Items]              
Restructuring reserve   351,000,000       351,000,000  
2014-2018 Restructuring Program | Other liabilities              
Restructuring Cost and Reserve [Line Items]              
Restructuring reserve   44,000,000       44,000,000  
2014-2018 Restructuring Program | Maximum              
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            
2014-2018 Restructuring Program | Severance and Related Costs              
Restructuring Cost and Reserve [Line Items]              
Restructuring charges   442,000,000 251,000,000        
Cash spent   243,000,000 17,000,000        
Non-cash asset write-downs   4,000,000 5,000,000        
Restructuring reserve   $ 395,000,000 224,000,000     $ 395,000,000 $ 224,000,000
2014 Restructuring Charges | Severance and Related Costs              
Restructuring Cost and Reserve [Line Items]              
Restructuring charges     52,000,000        
2013 Restructuring Charges | Severance and Related Costs              
Restructuring Cost and Reserve [Line Items]              
Restructuring charges     $ 21,000,000        
[1] Includes all charges recorded since program inception in 2012 through conclusion on December 31, 2014.
[2] Includes all charges recorded since program inception on May 6, 2014 through December 31, 2015.