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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Taxes Disclosure [Line Items]      
Federal statutory tax rate 35.00% 35.00% 35.00%
Deferred tax asset $ 882 $ 791  
Deferred income tax liabilities 4,851 4,989  
Deferred tax expense (benefit) associated with the revaluation of deferred income tax liabilities as a result of tax changes (54) (4)  
Foreign tax credit carryforwards 83 40  
Deferred tax assets, valuation allowance 20 29  
Income taxes receivable 166 117  
Income taxes payable 79 125  
Deferred taxes not recognized on excess of financial reporting over tax basis 4,734 3,871  
Unrecognized tax benefits that would affect effective tax rate if recognized 320 283 $ 304
Interest and penalties accrued during period 12 (25) (1)
Liability for interest and penalties 56 44 $ 68
Minimum [Member]      
Income Taxes Disclosure [Line Items]      
Liability for uncertain tax positions 13    
Maximum [Member]      
Income Taxes Disclosure [Line Items]      
Liability for uncertain tax positions $ 33    
Foreign Tax Credit Carryforwards [Member]      
Income Taxes Disclosure [Line Items]      
Foreign tax credit carryforwards, maturity date 2023    
Related to the Same Tax Jurisdiction [Member]      
Income Taxes Disclosure [Line Items]      
Deferred tax asset $ 20 10  
Deferred income tax liabilities 4,851 4,989  
State [Member]      
Income Taxes Disclosure [Line Items]      
Net operating loss carryforwards $ 1,500 1,200  
Net operating loss carryforwards, maturity year 2017    
Foreign [Member]      
Income Taxes Disclosure [Line Items]      
Net operating loss carryforwards $ 135 $ 137  
Net operating loss carryforwards, maturity year 2017    
Foreign net loss carry forwards, subject to expiration $ 6