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DEBT - Narrative (Details)
3 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
institution
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Feb. 29, 2020
USD ($)
Jan. 31, 2020
USD ($)
Debt Instrument [Line Items]            
Debt Repayments   $ 3,055,380,000        
Interest expense on early redemption   $ 8,999,000 $ 0 $ 0    
Debt repurchase, percentage   101.00%        
Amortization percent of charge 50.00% 50.00%        
Total available proceeds under trade receivables purchase and sale program         $ 300,000,000 $ 225,000,000
Available Proceeds under program $ 300,000,000 $ 300,000,000        
Asset-backed US obligations            
Debt Instrument [Line Items]            
Total fair value of debt 6,300,000,000 6,300,000,000 7,000,000,000.0      
Medium-term notes            
Debt Instrument [Line Items]            
Debt Repayments 600,000,000 1,600,000,000        
Global revolving credit facility            
Debt Instrument [Line Items]            
Debt Repayments   333,912,000        
Maximum borrowing capacity under global revolving credit facility $ 1,400,000,000 $ 1,400,000,000        
Number of lending institutions | institution   11        
Basis points   0.15%        
Amortization period   7 years        
Debt to consolidated net worth ratio 195.00% 195.00%        
Short-term commercial paper     227,000,000      
Current portion of long-term debt     400,000,000      
Short-term debt classified as long-term     $ 201,000,000      
Minimum | Global revolving credit facility            
Debt Instrument [Line Items]            
Basis points   0.075%        
Maximum            
Debt Instrument [Line Items]            
Ratio of indebtedness to net capital 3 3        
Maximum | Global revolving credit facility            
Debt Instrument [Line Items]            
Basis points   0.20%        
Letter of Credit | Global revolving credit facility            
Debt Instrument [Line Items]            
Maximum borrowing capacity under global revolving credit facility $ 75,000,000 $ 75,000,000        
Letter of credit outstanding amount 0 0        
Amount available under the credit facility, net of outstanding commercial paper borrowings $ 1,100,000,000 $ 1,100,000,000