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Debt (Details) - USD ($)
Oct. 09, 2020
Sep. 30, 2020
Sep. 02, 2020
Sep. 01, 2020
Jun. 22, 2020
Sep. 23, 2016
Revolving credit facility | JPMorgan Chase Bank, N.A.            
Debt Instrument [Line Items]            
Term     3 years      
Maximum borrowing capacity     $ 3,000,000,000.0     $ 2,500,000,000.0
Potential increase limit     $ 500,000,000.0      
Fee percentage on outstanding letters of credit     1.125%      
Fee percentage on undrawn amounts     0.125%      
Total Debt to Total Capital Ratio, minimum required     0.65      
Revolving credit facility | JPMorgan Chase Bank, N.A. | NYFRB Rate | Interest rate scenario one            
Debt Instrument [Line Items]            
Basis spread on variable interest rate     0.50%      
Revolving credit facility | JPMorgan Chase Bank, N.A. | Eurocurrency Rate | Interest rate scenario one            
Debt Instrument [Line Items]            
Basis spread on variable interest rate     1.00%      
Interest rate floor     0.00%      
Revolving credit facility | JPMorgan Chase Bank, N.A. | Eurocurrency Rate | Interest rate scenario two            
Debt Instrument [Line Items]            
Interest rate floor     0.00%      
Basis spread based on current rating   1.125%        
Revolving credit facility | JPMorgan Chase Bank, N.A. | Current variable rate in effect | Interest rate scenario one            
Debt Instrument [Line Items]            
Basis spread based on current rating   0.125%        
Letters of credit | JPMorgan Chase Bank, N.A.            
Debt Instrument [Line Items]            
Maximum borrowing capacity     $ 150,000,000.0      
Fee percentage on undrawn amounts     0.125%      
Senior Notes            
Debt Instrument [Line Items]            
Redemption price percentage   100.00%        
Senior Notes | 2022 Notes            
Debt Instrument [Line Items]            
Aggregate principal amount       $ 300,000,000.0    
Fixed interest rate       0.45%    
Senior Notes | 2025 Notes            
Debt Instrument [Line Items]            
Aggregate principal amount       $ 700,000,000.0    
Fixed interest rate       1.00%    
Senior Notes | 2027 Notes            
Debt Instrument [Line Items]            
Aggregate principal amount       $ 700,000,000.0    
Fixed interest rate       1.40%    
Senior Notes | 2031 Notes            
Debt Instrument [Line Items]            
Aggregate principal amount       $ 1,000,000,000.0    
Fixed interest rate       1.75%    
Senior Notes | 2030 Notes            
Debt Instrument [Line Items]            
Aggregate principal amount         $ 600,000,000.0  
Fixed interest rate         2.00%  
Senior Notes | 2020 Notes | Subsequent Event            
Debt Instrument [Line Items]            
Fixed interest rate 3.00%          
Redemption price percentage 100.00%          
Principal amount of debt redeemed $ 600,000,000.0