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Income Taxes - Schedule of Expiration Periods of Deferred Tax Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Tax Credit Carryforward [Line Items]    
Tax loss carryforwards $ 1,540  
Tax credit carryforwards 652  
Other 1,762  
Valuation allowance (1,940)  
Deferred tax assets, net 2,014 $ 2,320
Expires Within 10 Years [Member]    
Tax Credit Carryforward [Line Items]    
Tax loss carryforwards 81  
Tax credit carryforwards 428  
Valuation allowance (465)  
Deferred tax assets, net 44  
Expires Within 11-20 Years [Member]    
Tax Credit Carryforward [Line Items]    
Tax loss carryforwards 744  
Tax credit carryforwards 89  
Valuation allowance (663)  
Deferred tax assets, net 170  
No Expiration [Member]    
Tax Credit Carryforward [Line Items]    
Tax loss carryforwards 715  
Tax credit carryforwards 100  
Other 72  
Valuation allowance (677)  
Deferred tax assets, net 210  
Other [Member]    
Tax Credit Carryforward [Line Items]    
Tax credit carryforwards 35  
Other 1,690  
Valuation allowance (135)  
Deferred tax assets, net $ 1,590