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Debt - Additional Information (Detail)
1 Months Ended 12 Months Ended
Oct. 11, 2017
USD ($)
Jan. 27, 2016
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]              
Net aggregate proceeds     $ 16,618,000,000   $ 16,618,000,000 $ 15,882,000,000  
Revolving Credit Facility              
Debt Instrument [Line Items]              
Maturity period for senior notes   5 years          
Maximum borrowing capacity   $ 4,000,000,000          
Consolidated indebtedness to consolidated EBITDA ratio (not greater than)   3.75          
Credit facility amount outstanding           0  
Commercial Paper              
Debt Instrument [Line Items]              
Commercial paper program, amount available           $ 3,000,000,000  
Commercial paper program, maturity period           P397D  
Current debt             $ 567,000,000
Short-term debt, weighted average interest rate, at point in time             0.79%
Commercial paper program, amount outstanding           $ 0  
Senior Notes              
Debt Instrument [Line Items]              
Principal amount     16,750,000,000   16,750,000,000 16,000,000,000  
Net aggregate proceeds     16,618,000,000   16,618,000,000 15,882,000,000  
long-term debt, current maturities, gross     1,750,000,000   1,750,000,000    
Interest expense         505,000,000 399,000,000  
Senior Notes | September 2017 Notes              
Debt Instrument [Line Items]              
Principal amount     2,500,000,000   2,500,000,000    
Net aggregate proceeds     2,500,000,000   2,500,000,000    
Senior Notes | December 2015 Notes              
Debt Instrument [Line Items]              
Principal amount       $ 16,000,000,000      
Net aggregate proceeds       $ 15,900,000,000      
Senior Notes | 2017 Notes              
Debt Instrument [Line Items]              
Principal amount           1,750,000,000  
Net aggregate proceeds           $ 1,746,000,000  
long-term debt, current maturities, gross     $ 1,750,000,000   $ 1,750,000,000    
Senior Notes | 2017 Notes | Subsequent Event              
Debt Instrument [Line Items]              
Repayments of debt $ 1,750,000,000            
Senior Notes | If Redeemed Prior to Maturity Date or Par Call Date, As Applicable              
Debt Instrument [Line Items]              
Redemption price, as percentage of principal amount (percent)         100.00%    
Senior Notes | If Redeemed on or after Par Call Date, except for 2017 Notes              
Debt Instrument [Line Items]              
Redemption price, as percentage of principal amount (percent)         100.00%    
Senior Notes | Minimum | September 2017 Notes              
Debt Instrument [Line Items]              
Maturity period for senior notes     5 years        
Senior Notes | Minimum | December 2015 Notes              
Debt Instrument [Line Items]              
Maturity period for senior notes       2 years      
Senior Notes | Maximum | September 2017 Notes              
Debt Instrument [Line Items]              
Maturity period for senior notes     30 years        
Senior Notes | Maximum | December 2015 Notes              
Debt Instrument [Line Items]              
Maturity period for senior notes       30 years