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Debt - Senior Notes (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Mar. 01, 2021
Mar. 31, 2021
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
May 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]                
Debt instrument, face amount             $ 2,500,000,000  
Principal amount     $ 9,105,000,000   $ 9,105,000,000     $ 7,750,000,000
Loss on extinguishment of debt         $ 10,000,000 $ 0    
Senior Notes                
Debt Instrument [Line Items]                
Redemption price, percentage         101.00%      
Interest expense     59,000,000 $ 74,000,000 $ 125,000,000 144,000,000    
Fair value of long-term debt     $ 9,500,000,000   $ 9,500,000,000     8,300,000,000
Senior Notes | 6.000% Senior notes due 2056                
Debt Instrument [Line Items]                
Interest rate     6.00%   6.00%      
Principal amount     $ 0   $ 0     750,000,000
Senior Notes | 2.600% Senior notes due 2022                
Debt Instrument [Line Items]                
Interest rate     2.60%   2.60%      
Principal amount     $ 605,000,000   $ 605,000,000     1,000,000,000
Senior Notes | 1.400% Senior notes due 2026                
Debt Instrument [Line Items]                
Debt instrument, face amount             $ 750,000,000  
Interest rate     1.40%   1.40%   1.40%  
Principal amount     $ 750,000,000   $ 750,000,000     0
Senior Notes | 2.600% Senior notes due 2031                
Debt Instrument [Line Items]                
Debt instrument, face amount             $ 750,000,000  
Interest rate     2.60%   2.60%   2.60%  
Principal amount     $ 750,000,000   $ 750,000,000     0
Senior Notes | 3.650% Senior notes due 2051                
Debt Instrument [Line Items]                
Debt instrument, face amount             $ 1,000,000,000.0  
Interest rate     3.65%   3.65%   3.65%  
Principal amount     $ 1,000,000,000   $ 1,000,000,000     0
Senior Notes | 3.800% Senior notes due 2022                
Debt Instrument [Line Items]                
Interest rate     3.80%   3.80%      
Principal amount     $ 750,000,000   $ 750,000,000     750,000,000
Senior Notes | 2.750% Senior notes due 2023                
Debt Instrument [Line Items]                
Interest rate     2.75%   2.75%      
Principal amount     $ 750,000,000   $ 750,000,000     750,000,000
Senior Notes | 1.900% Senior notes due 2025                
Debt Instrument [Line Items]                
Interest rate     1.90%   1.90%      
Principal amount     $ 800,000,000   $ 800,000,000     800,000,000
Senior Notes | 3.600% Senior notes due 2027                
Debt Instrument [Line Items]                
Interest rate     3.60%   3.60%      
Principal amount     $ 850,000,000   $ 850,000,000     850,000,000
Senior Notes | 2.700% Senior notes due 2030                
Debt Instrument [Line Items]                
Interest rate     2.70%   2.70%      
Principal amount     $ 950,000,000   $ 950,000,000     $ 950,000,000
Convertible Debt | LIBOR-based floating rate debt                
Debt Instrument [Line Items]                
Debt instrument, face amount       $ 400,000,000   $ 400,000,000    
Senior Notes | 6.000% Senior notes due 2056                
Debt Instrument [Line Items]                
Debt instrument, face amount $ 750,000,000              
Interest rate 6.00%              
Debt repaid $ 750,000,000              
Redemption price, percentage 100.00%              
Senior Notes | 2.600% Senior notes due 2022                
Debt Instrument [Line Items]                
Debt instrument, face amount   $ 1,000,000,000            
Interest rate   2.60%            
Debt repaid   $ 405,000,000            
Percentage of principal amount redeemed   39.00%            
Principal amount   $ 395,000,000            
Loss on extinguishment of debt   $ 10,000,000