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FAIR VALUE MEASUREMENT - ADDITIONAL INFORMATION (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]    
Floating rate senior term loan $ 2,284,000,000 $ 1,438,000,000
Senior Notes | Senior Notes, $450 Million    
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]    
Debt instrument face amount $ 450,000,000  
Debt, fixed rate 4.10%  
Senior Notes | Fixed rate senior notes 750 million due June 2030    
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]    
Floating rate senior term loan $ 750,000,000 $ 0
Debt instrument face amount $ 750,000,000  
Debt, fixed rate 3.30% 0.00%
Estimate of Fair Value, Fair Value Disclosure    
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]    
Floating rate senior term loan $ 2,509,000,000 $ 1,441,000,000
Carrying (Reported) Amount, Fair Value Disclosure    
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]    
Floating rate senior term loan $ 2,281,000,000 $ 1,441,000,000