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Debt - Narrative (Details) - USD ($)
1 Months Ended 6 Months Ended
Aug. 16, 2021
Jun. 30, 2021
Aug. 01, 2021
Jul. 26, 2020
Mar. 31, 2020
Sep. 30, 2016
Debt Instrument [Line Items]            
Issuance of debt, net of issuance costs     $ 4,985,000,000 $ 4,971,000,000    
Commercial paper outstanding     0      
Revolving Credit Facility            
Debt Instrument [Line Items]            
Borrowing capacity     575,000,000      
Additional borrowing capacity     425,000,000      
Line of credit outstanding     0      
Commercial Paper            
Debt Instrument [Line Items]            
Borrowing capacity     $ 575,000,000      
Notes Issued June 2021            
Debt Instrument [Line Items]            
Issuance of debt, net of issuance costs   $ 4,980,000,000        
Notes Issued June 2021 | Minimum            
Debt Instrument [Line Items]            
Debt redemption, notice period   10 days        
Notes Issued June 2021 | Maximum            
Debt Instrument [Line Items]            
Debt redemption, notice period   60 days        
0.309% Notes Due 2023            
Debt Instrument [Line Items]            
Face amount of debt   $ 1,250,000,000        
Stated interest rate   0.309% 0.309%      
0.584% Notes Due 2024            
Debt Instrument [Line Items]            
Face amount of debt   $ 1,250,000,000        
Stated interest rate   0.584% 0.584%      
1.55% Notes Due 2028            
Debt Instrument [Line Items]            
Face amount of debt   $ 1,250,000,000        
Stated interest rate   1.55% 1.55%      
2.00% Notes Due 2031            
Debt Instrument [Line Items]            
Face amount of debt   $ 1,250,000,000        
Stated interest rate   2.00% 2.00%      
2.85% Notes Due 2030            
Debt Instrument [Line Items]            
Face amount of debt         $ 1,500,000,000  
Stated interest rate     2.85%   2.85%  
3.50% Notes Due 2040            
Debt Instrument [Line Items]            
Face amount of debt         $ 1,000,000,000  
Stated interest rate     3.50%   3.50%  
3.50% Notes Due 2050            
Debt Instrument [Line Items]            
Face amount of debt         $ 2,000,000,000  
Stated interest rate     3.50%   3.50%  
3.70% Notes Due 2060            
Debt Instrument [Line Items]            
Face amount of debt         $ 500,000,000  
Stated interest rate     3.70%   3.70%  
2.20% Notes Due 2021            
Debt Instrument [Line Items]            
Face amount of debt           $ 1,000,000,000
Stated interest rate     2.20%     2.20%
2.20% Notes Due 2021 | Subsequent Event            
Debt Instrument [Line Items]            
Stated interest rate 2.20%          
Repayments of debt $ 1,000,000,000          
3.20% Notes Due 2026            
Debt Instrument [Line Items]            
Face amount of debt           $ 1,000,000,000
Stated interest rate     3.20%     3.20%