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Debt - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Nov. 26, 2019
Dec. 31, 2018
Jun. 30, 2018
May 17, 2018
Jun. 30, 2017
Aug. 18, 2015
Debt Instrument [Line Items]              
Annual long term debt maturity year 2020 $ 0            
Annual long term debt maturity year 2021 0            
Annual long term debt maturity year 2022 0            
Annual long term debt maturity year 2023 0            
Annual long term debt maturity year 2024 0            
Annual long term debt maturity thereafter 3,900,000,000            
Commercial paper borrowings outstanding $ 0   $ 0        
Indebtedness to cash flow (not greater than) 4            
Senior Notes              
Debt Instrument [Line Items]              
Debt face amount             $ 2,000,000,000.0
2.5% Senior Notes, due 2029 | Senior Notes              
Debt Instrument [Line Items]              
Debt face amount   $ 500,000,000          
Interest rate (as a percent) 2.50% 2.50%          
3.3% Senior Notes, due 2020 | Senior Notes              
Debt Instrument [Line Items]              
Debt face amount $ 700,000,000           $ 700,000,000
Interest rate (as a percent) 3.30%           3.30%
3.25% Senior Notes, due 2049 | Senior Notes              
Debt Instrument [Line Items]              
Debt face amount   $ 600,000,000          
Interest rate (as a percent) 3.25% 3.25%          
6.55% Senior Notes, due 2037 | Senior Notes              
Debt Instrument [Line Items]              
Debt face amount $ 400,000,000            
Interest rate (as a percent) 6.55%            
4.5% Senior Notes, due 2048 | Senior Notes              
Debt Instrument [Line Items]              
Debt face amount         $ 500,000,000    
Interest rate (as a percent) 4.50%       4.50%    
2.5% Senior Notes, due 2018 | Senior Notes              
Debt Instrument [Line Items]              
Debt face amount       $ 400,000,000     $ 400,000,000
Interest rate (as a percent)       2.50%     2.50%
Five-year Revolving Credit Facility | Revolving Credit Facility Due 2022              
Debt Instrument [Line Items]              
Credit facility, maximum borrowing capacity           $ 1,200,000,000  
Term of debt instrument       5 years      
Commitment fee ratio 0.10%            
Minimum | Five-year Revolving Credit Facility | Revolving Credit Facility Due 2022              
Debt Instrument [Line Items]              
Commitment fee ratio 0.08%            
Maximum | Five-year Revolving Credit Facility | Revolving Credit Facility Due 2022              
Debt Instrument [Line Items]              
Commitment fee ratio 0.175%