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Debt - Additional Information (Detail) - USD ($)
1 Months Ended 4 Months Ended 12 Months Ended
Aug. 24, 2018
Nov. 30, 2018
Sep. 30, 2016
May 31, 2016
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Sep. 24, 2017
Sep. 25, 2016
Debt Instrument [Line Items]                    
Interest payments           $ 635,000,000 $ 610,000,000 $ 600,000,000    
Short term borrowings due within one year         $ 1,500,000,000 1,500,000,000 750,000,000      
Outstanding principal amount of debt instruments         15,312,000,000 15,312,000,000 15,498,000,000      
Current maturities of long-term debt and commercial paper         1,500,000,000 1,500,000,000 750,000,000      
Commercial paper         $ 600,000,000 $ 600,000,000 0      
Commercial paper borrowings             $ 0      
Interest rate swaps                    
Debt Instrument [Line Items]                    
Derivative liability, notional amount       $ 450,000,000            
1.85% due 2018                    
Debt Instrument [Line Items]                    
Repayments of debt   $ 750,000,000                
Interest rate         1.85% 1.85% 1.85%      
Outstanding principal amount of debt instruments         $ 0 $ 0 $ 750,000,000      
4.09% due 2052                    
Debt Instrument [Line Items]                    
Interest rate         4.09% 4.09%        
Outstanding principal amount of debt instruments         $ 1,578,000,000 $ 1,578,000,000 1,578,000,000      
4.70% To 8.50% Senior Notes Maturing 2029 To 2046 | Senior Notes                    
Debt Instrument [Line Items]                    
Debt instrument, unamortized premium                 $ 237,000,000  
4.25% due 2019                    
Debt Instrument [Line Items]                    
Interest rate         4.25% 4.25%        
Outstanding principal amount of debt instruments         $ 900,000,000 $ 900,000,000 900,000,000      
Unsecured Debt | Five Year Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Line of credit facility $ 2,500,000,000.0                  
Line of credit facility expiration period 5 years                  
Additional amount to increase credit facility, granted at banks' discretion         500,000,000          
Line of credit facility, amount outstanding         $ 0 $ 0 $ 0      
Senior Notes | 4.09% due 2052                    
Debt Instrument [Line Items]                    
Interest rate                 4.09%  
Amount of issued debt                 $ 1,600,000,000  
Senior Notes | 4.70% To 8.50% Senior Notes Maturing 2029 To 2046                    
Debt Instrument [Line Items]                    
Debt instrument, repurchase amount                 $ 1,400,000,000  
Senior Notes | 4.70% To 8.50% Senior Notes Maturing 2029 To 2046 | Minimum                    
Debt Instrument [Line Items]                    
Interest rate                 4.70%  
Senior Notes | 4.70% To 8.50% Senior Notes Maturing 2029 To 2046 | Maximum                    
Debt Instrument [Line Items]                    
Interest rate                 8.50%  
Notes Payable to Banks | 2.13% Long-Term Notes                    
Debt Instrument [Line Items]                    
Interest rate                   2.13%
Repayments of notes payable     $ 500,000,000              
Notes Payable to Banks | 7.65% Long-term notes                    
Debt Instrument [Line Items]                    
Interest rate       7.65%            
Repayments of notes payable       $ 452,000,000            
Commercial Paper                    
Debt Instrument [Line Items]                    
Weighted average interest rate         2.89% 2.89%