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DEBT - Debt Balances, Net of Unamortized Debt Issuance Costs (Details) - USD ($)
Sep. 30, 2020
Dec. 31, 2019
Carrying Amount    
Debt Instrument [Line Items]    
Net carrying amount of the liability component $ 2,680,000,000 $ 2,216,000,000
Finance leases 9,000,000 14,000,000
Debt, gross 2,717,000,000  
Net carrying amount of the liability component 2,680,000,000 2,216,000,000
2025 Notes | Senior notes    
Debt Instrument [Line Items]    
Debt, gross 500,000,000 0
Unamortized debt discount and issuance costs (7,000,000) 0
Net carrying amount of the liability component 493,000,000 0
2026 Notes | Senior notes    
Debt Instrument [Line Items]    
Debt, gross 750,000,000 750,000,000
Unamortized debt discount and issuance costs (7,000,000) (8,000,000)
Net carrying amount of the liability component 743,000,000 742,000,000
2028 Notes | Senior notes    
Debt Instrument [Line Items]    
Debt, gross 350,000,000 350,000,000
Unamortized debt discount and issuance costs (4,000,000) (5,000,000)
Net carrying amount of the liability component 346,000,000 345,000,000
Convertible Notes, net | Convertible notes | Carrying Amount    
Debt Instrument [Line Items]    
Debt, gross 230,000,000 230,000,000
Unamortized debt discount and issuance costs (17,000,000) (23,000,000)
Net carrying amount of the liability component 213,000,000 207,000,000
Convertible Notes, net | Convertible notes    
Debt Instrument [Line Items]    
Debt, gross 230,000,000 230,000,000
Unamortized debt issuance costs (2,000,000) (3,000,000)
Net carrying amount of the liability component 213,000,000 207,000,000
Corporate credit facility | Term Loan    
Debt Instrument [Line Items]    
Debt, gross 887,000,000 893,000,000
Unamortized debt discount and issuance costs (11,000,000) (12,000,000)
Net carrying amount of the liability component 876,000,000 881,000,000
Corporate credit facility | Revolving Corporate Credit Facility    
Debt Instrument [Line Items]    
Debt, gross 0 30,000,000
Unamortized debt issuance costs (3,000,000) (3,000,000)
Net carrying amount of the liability component $ 0 $ 27,000,000