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Long-Term Debt - Additional Information (Details)
1 Months Ended 12 Months Ended
Feb. 06, 2019
Sep. 26, 2018
USD ($)
Oct. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Feb. 15, 2019
USD ($)
Debt Disclosure [Abstract]                
Fair value of total debt         $ 6,000,000,000 $ 5,000,000,000    
Debt Instrument [Line Items]                
Loss on early debt extinguishment         $ 14,000,000 $ 0 $ 0  
Term loan                
Debt Instrument [Line Items]                
Repaid debt       $ 540,000,000        
Senior notes                
Debt Instrument [Line Items]                
Principal amount       $ 2,000,000,000        
Interest rate increase in the event the Company's credit rating is downgraded below investment grade (as percent)       2.00%        
Redeemed debt   $ 246,000,000            
Senior notes | 3.8% senior notes due 2023                
Debt Instrument [Line Items]                
Principal amount       $ 1,000,000,000        
Interest rate       3.80% 3.80%      
Senior notes | 4.2% senior notes due 2028                
Debt Instrument [Line Items]                
Principal amount       $ 1,000,000,000        
Interest rate       4.20% 4.20%      
Senior notes | 2.7% senior notes due 2020                
Debt Instrument [Line Items]                
Interest rate       2.70% 2.70%      
Senior notes | 3.85% senior notes due 2025                
Debt Instrument [Line Items]                
Interest rate       3.85% 3.85%      
Senior notes | 4.625% senior notes due 2020                
Debt Instrument [Line Items]                
Principal amount       $ 450,000,000        
Interest rate     4.625% 4.625%   4.625%    
Redeemed debt     $ 204,000,000          
Loss on early debt extinguishment         $ 14,000,000      
Senior notes | 3.5% senior notes due 2022                
Debt Instrument [Line Items]                
Interest rate       3.50% 3.50%      
Senior notes | 4.75% senior notes due 2021                
Debt Instrument [Line Items]                
Interest rate       4.75% 4.75%      
Term loan and senior notes                
Debt Instrument [Line Items]                
Debt issuance costs         $ 25,000,000 $ 14,000,000    
Revolving credit facility                
Debt Instrument [Line Items]                
Revolving credit with a syndicate of banks       $ 2,000,000,000        
Weighted average variable interest rate         3.51%      
Consolidated indebtedness to consolidated net earnings limit     3.5          
Consolidated net earnings to consolidated interest expense     3.0          
Repaid debt       $ 1,100,000,000        
Debt issuance costs         $ 5,000,000 $ 3,000,000    
Subsequent Event | Revolving credit facility                
Debt Instrument [Line Items]                
Revolving credit, increase limit               $ 1,500,000,000
Subsequent Event | Term Loan Facility | Line of Credit | Senior Unsecured Term Loan Facility, Loans With Three Year Maturity                
Debt Instrument [Line Items]                
Revolving credit with a syndicate of banks               $ 1,500,000,000
Debt Instrument, Option, One | Subsequent Event | Revolving credit facility                
Debt Instrument [Line Items]                
Consolidated indebtedness to consolidated net earnings limit 4.0              
Debt Instrument, Option, Two | Subsequent Event | Revolving credit facility                
Debt Instrument [Line Items]                
Consolidated indebtedness to consolidated net earnings limit 4.5