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LONG-TERM DEBT AND LINE OF CREDIT - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended
Apr. 30, 2020
Mar. 31, 2020
Jan. 31, 2020
Mar. 31, 2019
Feb. 28, 2019
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Debt Instrument [Line Items]                
Proceeds from debt, net of issuance costs             $ 739,000,000  
Book value   $ 7,426,000,000       $ 7,426,000,000   $ 6,377,000,000
Pretax charge related to early extinguishment of debt             12,000,000  
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net       $ 500,000,000     $ 500,000,000  
Borrowings on line of credit (Note 9)   550,000,000       550,000,000   $ 230,000,000
4.00 percent due in April 2030                
Debt Instrument [Line Items]                
Debt issued   $ 750,000,000       $ 750,000,000    
Debt instrument, interest rate, stated percentage   4.00%       4.00%    
Proceeds from debt, net of issuance costs   $ 732,000,000            
Debt, maturity date   Apr. 30, 2030            
4.70 percent due 2021                
Debt Instrument [Line Items]                
Debt issued   $ 569,000,000       $ 569,000,000    
Debt instrument, interest rate, stated percentage   4.70%       4.70%    
Book value   $ 577,000,000       $ 577,000,000    
Debt, redemption price           $ 588,000,000    
4.70 percent due 2021 | Subsequent Event [Member]                
Debt Instrument [Line Items]                
Debt instrument, interest rate, stated percentage 4.70%              
Debt, maturity date Mar. 31, 2021              
4.00 percent due in November 2029                
Debt Instrument [Line Items]                
Debt issued         $ 750,000,000      
Debt instrument, interest rate, stated percentage         4.00%      
Debt, maturity date         Nov. 30, 2029      
7.38 percent due in October 2019                
Debt Instrument [Line Items]                
Debt instrument, interest rate, stated percentage       7.38%     7.38%  
Debt, maturity date       Oct. 31, 2019        
Repayments of debt       $ 500,000,000        
Amended and Restated                
Debt Instrument [Line Items]                
Line of credit, maximum borrowing capacity     $ 1,500,000,000          
Line of credit expiration date     Jan. 31, 2025          
Line of credit expiration period     5 years