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Debt - Additional Information (Details)
1 Months Ended 12 Months Ended
Aug. 05, 2020
May 05, 2020
USD ($)
May 04, 2020
Dec. 31, 2020
USD ($)
Aug. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2020
EUR (€)
Aug. 14, 2020
USD ($)
Jul. 14, 2020
USD ($)
Mar. 18, 2020
USD ($)
Dec. 31, 2019
EUR (€)
Jun. 30, 2015
EUR (€)
Debt Instrument [Line Items]                            
Revolving credit facility repayments           $ 2,672,000,000 $ 0 $ 0            
Revolving Credit Facility                            
Debt Instrument [Line Items]                            
Credit facility             2,000,000,000              
Credit facility borrowings outstanding             0         $ 1,900,000,000    
Letter of Credit                            
Debt Instrument [Line Items]                            
Letters of credit issued under the credit facility       $ 13,000,000   13,000,000 16,000,000              
Uncommitted credit facility                            
Debt Instrument [Line Items]                            
Credit facility borrowings outstanding       0   0 0              
Uncommitted credit facility | international subsidiary                            
Debt Instrument [Line Items]                            
Credit facility | €                 € 50,000,000          
Senior notes                            
Debt Instrument [Line Items]                            
Accrued interest related to senior notes       110,000,000   110,000,000 76,000,000              
Fair value of senior notes       $ 9,100,000,000   $ 9,100,000,000 $ 5,100,000,000              
Senior notes | Upon the occurrence of certain change of control triggering events                            
Debt Instrument [Line Items]                            
Debt instrument redemption price percentage           101.00%                
5.95% senior notes due 2020                            
Debt Instrument [Line Items]                            
Senior unsecured notes principal amount                   $ 750,000,000        
Senior notes, interest rate       5.95%   5.95% 5.95%   5.95% 5.95%     5.95%  
3.6% senior notes due 2023                            
Debt Instrument [Line Items]                            
Senior notes, interest rate       3.60%   3.60% 3.60%   3.60%       3.60%  
3.6% senior notes due 2023 | Unsecured senior notes                            
Debt Instrument [Line Items]                            
Senior unsecured notes principal amount                     $ 500,000,000      
Senior notes, interest rate                     3.60%      
Senior notes issued price percentage                     99.922%      
Additional interest if certain obligations are not satisfied       0.0025   0.0025     0.0025          
4.625% senior notes due 2027                            
Debt Instrument [Line Items]                            
Senior notes, interest rate       4.625%   4.625% 4.625%   4.625%       4.625%  
4.625% senior notes due 2027 | Unsecured senior notes                            
Debt Instrument [Line Items]                            
Senior unsecured notes principal amount                     $ 750,000,000      
Senior notes, interest rate                     4.625%      
Senior notes issued price percentage                     99.997%      
Additional interest if certain obligations are not satisfied       0.0025   0.0025     0.0025          
6.25% senior notes due 2025                            
Debt Instrument [Line Items]                            
Senior notes, interest rate       6.25%   6.25% 6.25%   6.25%       6.25%  
6.25% senior notes due 2025 | Unsecured senior notes                            
Debt Instrument [Line Items]                            
Senior unsecured notes principal amount   $ 2,000,000,000                        
Senior notes, interest rate   6.25%                        
Debt instrument redemption price percentage   100.00%                        
7.0% senior notes due 2025                            
Debt Instrument [Line Items]                            
Senior notes, interest rate       7.00%   7.00% 7.00%   7.00%       7.00%  
7.0% senior notes due 2025 | Unsecured senior notes                            
Debt Instrument [Line Items]                            
Senior unsecured notes principal amount   $ 750,000,000                        
Senior notes, interest rate   7.00%                        
Debt instrument redemption price percentage   100.00%                        
7.0% senior notes due 2025 | Unsecured senior notes | Maximum                            
Debt Instrument [Line Items]                            
Percentage of principal amount redeemed   40.00%                        
2.5% (€650 million) senior notes due 2022                            
Debt Instrument [Line Items]                            
Senior unsecured notes principal amount       $ 650,000,000   $ 650,000,000     € 650       € 650 € 650,000,000
Senior notes, interest rate       2.50%   2.50% 2.50%   2.50%       2.50% 2.50%
Senior notes issued price percentage       99.525%   99.525%     99.525%          
Debt instrument redemption price percentage           100.00%                
4.5% senior notes due 2024                            
Debt Instrument [Line Items]                            
Senior unsecured notes principal amount       $ 500,000,000   $ 500,000,000                
Senior notes, interest rate       4.50%   4.50% 4.50%   4.50%       4.50%  
Senior notes issued price percentage       99.444%   99.444%     99.444%          
Debt instrument redemption price percentage           100.00%                
5.0% senior notes due 2026                            
Debt Instrument [Line Items]                            
Senior unsecured notes principal amount       $ 750,000,000   $ 750,000,000                
Senior notes, interest rate       5.00%   5.00% 5.00%   5.00%       5.00%  
Senior notes issued price percentage       99.535%   99.535%     99.535%          
Debt instrument redemption price percentage           100.00%                
3.8% senior notes due 2028                            
Debt Instrument [Line Items]                            
Senior unsecured notes principal amount       $ 1,000,000,000   $ 1,000,000,000                
Senior notes, interest rate       3.80%   3.80% 3.80%   3.80%       3.80%  
Senior notes issued price percentage       99.747%   99.747%     99.747%          
Debt instrument redemption price percentage           100.00%                
3.25% senior dues due 2030                            
Debt Instrument [Line Items]                            
Senior unsecured notes principal amount       $ 1,250,000,000   $ 1,250,000,000                
Senior notes, interest rate       3.25%   3.25% 3.25%   3.25%       3.25%  
Senior notes issued price percentage       99.225%   99.225%     99.225%          
Debt instrument redemption price percentage           100.00%                
Amended credit facility maturing on may 31, 2023                            
Debt Instrument [Line Items]                            
Credit facility       $ 2,000,000,000   $ 2,000,000,000                
Commitment fee on undrawn amounts     2.25%                      
Amended credit facility maturing on may 31, 2023 | Line of Credit                            
Debt Instrument [Line Items]                            
Revolving credit facility repayments       650,000,000 $ 478,000,000                  
Amended credit facility maturing on may 31, 2023 | Upon the occurrence of certain change of control triggering events                            
Debt Instrument [Line Items]                            
Debt instrument, covenant, leverage ratio, maximum     5.00                      
Amended credit facility maturing on may 31, 2023 | Debt instrument, redemption, period two | Base rate                            
Debt Instrument [Line Items]                            
Commitment fee on undrawn amounts     1.25%                      
Amended credit facility maturing on may 31, 2023 | Minimum | Debt instrument, redemption, period two                            
Debt Instrument [Line Items]                            
Senior notes, interest rate     1.00%                      
Amended credit facility maturing on may 31, 2023 | Minimum | Debt instrument, redemption, period three | Base rate                            
Debt Instrument [Line Items]                            
Senior notes, interest rate     0.00%                      
Amended credit facility maturing on may 31, 2023 | Maximum | Debt instrument, redemption, period two                            
Debt Instrument [Line Items]                            
Senior notes, interest rate     1.75%                      
Amended credit facility maturing on may 31, 2023 | Maximum | Debt instrument, redemption, period three | Base rate                            
Debt Instrument [Line Items]                            
Senior notes, interest rate     0.75%                      
Foreign credit facility                            
Debt Instrument [Line Items]                            
Additional borrowing capacity       855,000,000   855,000,000                
Revolving credit facility repayments           772,000,000                
Credit facility borrowings outstanding       $ 0   $ 0                
Foreign credit facility | Eurodollar                            
Debt Instrument [Line Items]                            
Basis points added to LIBOR rate 2.50%                          
Foreign credit facility | Line of Credit                            
Debt Instrument [Line Items]                            
Revolving credit facility repayments         $ 772,000,000                  
Foreign credit facility | Upon the occurrence of certain change of control triggering events                            
Debt Instrument [Line Items]                            
Debt instrument, covenant, leverage ratio, maximum 5.00                          
Foreign credit facility | Debt instrument, redemption, period two | Base rate                            
Debt Instrument [Line Items]                            
Commitment fee on undrawn amounts 1.50%                          
Foreign credit facility | Minimum | Debt instrument, redemption, period two                            
Debt Instrument [Line Items]                            
Senior notes, interest rate 1.25%                          
Foreign credit facility | Minimum | Debt instrument, redemption, period three | Base rate                            
Debt Instrument [Line Items]                            
Senior notes, interest rate 0.25%                          
Foreign credit facility | Maximum | Debt instrument, redemption, period two                            
Debt Instrument [Line Items]                            
Senior notes, interest rate 2.00%                          
Foreign credit facility | Maximum | Debt instrument, redemption, period three | Base rate                            
Debt Instrument [Line Items]                            
Senior notes, interest rate 1.00%