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DEBT - Debt Balances, Net of Unamortized Debt Issuance Costs (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Debt, gross $ 2,939  
Net carrying amount of the liability component 2,795 $ 2,680
Carrying Amount    
Debt Instrument [Line Items]    
Net carrying amount of the liability component 2,795 2,680
Finance Leases 9 8
2025 Notes | Senior notes    
Debt Instrument [Line Items]    
Debt, gross 500 500
Unamortized debt discount and issuance costs (5) (6)
Net carrying amount of the liability component 495 494
2026 Notes | Senior notes    
Debt Instrument [Line Items]    
Debt, gross 0 750
Unamortized debt discount and issuance costs 0 (6)
Net carrying amount of the liability component 0 744
2028 Notes | Senior notes    
Debt Instrument [Line Items]    
Debt, gross 350 350
Unamortized debt discount and issuance costs (4) (4)
Net carrying amount of the liability component 346 346
2029 Notes | Senior notes    
Debt Instrument [Line Items]    
Debt, gross 500 0
Unamortized debt discount and issuance costs (7) 0
Net carrying amount of the liability component 493 0
2022 Convertible Notes | Convertible notes    
Debt Instrument [Line Items]    
Debt, gross 230 230
Net carrying amount of the liability component 221 215
2022 Convertible Notes | Convertible notes | Carrying Amount    
Debt Instrument [Line Items]    
Debt, gross 230 230
Unamortized debt discount and issuance costs (9) (15)
Net carrying amount of the liability component 221 215
2026 Convertible Notes    
Debt Instrument [Line Items]    
Unamortized debt discount and issuance costs (15)  
Net carrying amount of the liability component 449  
2026 Convertible Notes | Convertible notes    
Debt Instrument [Line Items]    
Debt, gross 575 0
Net carrying amount of the liability component 455 0
2026 Convertible Notes | Convertible notes | Carrying Amount    
Debt Instrument [Line Items]    
Debt, gross 575 0
Unamortized debt discount and issuance costs (120) 0
Net carrying amount of the liability component 455 0
Corporate Credit Facility | Term Loan    
Debt Instrument [Line Items]    
Debt, gross 784 884
Unamortized debt discount and issuance costs (8) (11)
Net carrying amount of the liability component $ 776 $ 873