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Debt - Senior Notes (Details) - USD ($)
1 Months Ended 12 Months Ended
Mar. 01, 2021
Feb. 24, 2022
Mar. 31, 2021
Jul. 31, 2020
Jun. 30, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
May 31, 2021
Mar. 31, 2020
Debt Instrument [Line Items]                    
Principal amount           $ 9,105,000,000 $ 7,750,000,000      
Loss on extinguishment of debt           10,000,000 0 $ 0    
Repayment of debt           $ 1,156,000,000 1,771,000,000 1,550,000,000    
Senior Notes                    
Debt Instrument [Line Items]                    
Face amount                 $ 2,500,000,000  
Redemption percentage in event of change in control           101.00%        
Interest expense           $ 257,000,000 284,000,000 301,000,000    
Fair value of long-term debt           $ 9,500,000,000 8,300,000,000      
Senior Notes | 6.000% Senior notes due 2056                    
Debt Instrument [Line Items]                    
Interest rate           6.00%        
Principal amount           $ 0 750,000,000      
Senior Notes | 2.600% Senior notes due 2022                    
Debt Instrument [Line Items]                    
Interest rate           2.60%        
Principal amount           $ 605,000,000 1,000,000,000      
Senior Notes | 1.400% Senior notes due 2026                    
Debt Instrument [Line Items]                    
Face amount                 $ 750,000,000  
Interest rate           1.40%     1.40%  
Principal amount           $ 750,000,000 0      
Senior Notes | 2.600% Senior notes due 2031                    
Debt Instrument [Line Items]                    
Face amount                 $ 750,000,000  
Interest rate           2.60%     2.60%  
Principal amount           $ 750,000,000 0      
Senior Notes | 3.650% Senior notes due 2051                    
Debt Instrument [Line Items]                    
Face amount                 $ 1,000,000,000  
Interest rate           3.65%     3.65%  
Principal amount           $ 1,000,000,000 0      
Senior Notes | 1.900% Senior notes due 2025                    
Debt Instrument [Line Items]                    
Face amount         $ 300,000,000         $ 500,000,000
Interest rate         1.90% 1.90%       1.90%
Principal amount           $ 800,000,000 800,000,000      
Senior Notes | 2.700% Senior notes due 2030                    
Debt Instrument [Line Items]                    
Face amount         $ 450,000,000         $ 500,000,000
Interest rate         2.70% 2.70%       2.70%
Principal amount           $ 950,000,000 950,000,000      
Senior Notes | 2.875% Senior notes due 2021                    
Debt Instrument [Line Items]                    
Face amount               $ 750,000,000    
Interest rate         2.875%     2.875%    
Loss on extinguishment of debt         $ 10,000,000          
Repurchased face amount         750,000,000          
Payments for repurchase of debt         771,000,000          
Debt premium         $ 11,000,000          
Senior Notes | 2.150% Senior notes due 2020                    
Debt Instrument [Line Items]                    
Interest rate         2.15%          
Repayments of debt         $ 500,000,000          
Senior Notes | 3.250% Senior notes due 2020                    
Debt Instrument [Line Items]                    
Interest rate       3.25%            
Redemption price percentage       100.00%            
Principal amount       $ 500,000,000            
Senior Notes | Floating rate notes                    
Debt Instrument [Line Items]                    
Repayment of debt               $ 400,000,000    
Senior Notes | 2.200% Senior notes due 2019                    
Debt Instrument [Line Items]                    
Interest rate               2.20%    
Repayment of debt               $ 1,150,000,000    
Senior Notes | 3.800% Senior notes due 2022                    
Debt Instrument [Line Items]                    
Interest rate           3.80%        
Principal amount           $ 750,000,000 750,000,000      
Senior Notes | 2.750% Senior notes due 2023                    
Debt Instrument [Line Items]                    
Interest rate           2.75%        
Principal amount           $ 750,000,000 750,000,000      
Senior Notes | 3.600% Senior notes due 2027                    
Debt Instrument [Line Items]                    
Interest rate           3.60%        
Principal amount           $ 850,000,000 $ 850,000,000      
Convertible Debt | LIBOR-based floating rate debt                    
Debt Instrument [Line Items]                    
Face amount         $ 400,000,000          
Senior Notes | 6.000% Senior notes due 2056                    
Debt Instrument [Line Items]                    
Face amount $ 750,000,000                  
Interest rate 6.00%                  
Repayments of debt $ 750,000,000                  
Redemption price percentage 100.00%                  
Senior Notes | 2.600% Senior notes due 2022                    
Debt Instrument [Line Items]                    
Face amount     $ 1,000,000,000              
Interest rate     2.60%              
Repayments of debt     $ 405,000,000              
Percentage of principal amount redeemed     39.00%              
Principal amount     $ 395,000,000              
Loss on extinguishment of debt     $ 10,000,000              
Senior Notes | 3.800% Senior notes due 2022 | Subsequent Event                    
Debt Instrument [Line Items]                    
Interest rate   3.80%                
Percentage of principal amount redeemed   100.00%                
Principal amount   $ 750,000,000                
Repayment of debt   $ 750,000,000