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SHORT-TERM AND LONG-TERM DEBT - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 6 Months Ended
Mar. 31, 2020
Feb. 29, 2020
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Oct. 31, 2017
Debt Instrument [Line Items]            
Debt issuance costs and discounts, net of amortization     $ (27)   $ (21)  
Borrowings under lines of credit     12 $ 19    
Line of Credit [Member]            
Debt Instrument [Line Items]            
Outstanding lines of credit     15   $ 55  
Revolving Credit Facility [Member] | Line of Credit [Member]            
Debt Instrument [Line Items]            
Line Of Credit Facility, Option To Increase Maximum Borrowing Capacity     $ 1,875      
Maximum availability of revolving credit facility   $ 1,250        
Borrowings under lines of credit $ 1,000          
Revolving Credit Facility [Member] | Base Rate [Member] | Line of Credit [Member]            
Debt Instrument [Line Items]            
Effective interest rate   1.00%        
Revolving Credit Facility [Member] | Fed Funds Effective Rate Overnight Index Swap Rate [Member] | Line of Credit [Member]            
Debt Instrument [Line Items]            
Effective interest rate   0.50%        
Revolving Credit Facility [Member] | Eurodollar [Member] | Line of Credit [Member]            
Debt Instrument [Line Items]            
Effective interest rate   1.00%        
Senior Notes, 1.85% due 2025 [Member] | Senior Notes [Member]            
Debt Instrument [Line Items]            
Debt principal amount   $ 500        
Interest rate   1.85%        
Basis points   0.10%        
Redemption price, percentage upon change of control   101.00%        
Redemption price   100.00%        
Debt issuance costs and discounts, net of amortization   $ 5        
5-Year Unsecured Revolving Line Of Credit [Member] | Domestic Line of Credit [Member]            
Debt Instrument [Line Items]            
Maximum availability of revolving credit facility           $ 750