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Derivative Financial Instruments - Narrative (Details)
$ in Millions
9 Months Ended
Sep. 30, 2022
USD ($)
MMBTU / d
bblPerDay
$ / MMBTU
Dec. 31, 2021
USD ($)
Derivative [Line Items]    
Long-term debt | $ $ 5,241 $ 6,975
0.250% convertible senior notes due 2025 | Convertible debt    
Derivative [Line Items]    
Long-term debt | $ 285  
Principal repayments in progress | $ $ 45  
Marketing Derivative, January 1, 2022 through December 31, 2026    
Derivative [Line Items]    
Purchase contract, amount of barrel to be purchased and sold | bblPerDay 50,000  
Marketing Derivative, May 1, 2022 through April 30, 2027    
Derivative [Line Items]    
Purchase contract, amount of barrel to be purchased and sold | bblPerDay 40,000  
Marketing Derivative, August 1, 2022 through July 31, 2027    
Derivative [Line Items]    
Purchase contract, amount of barrel to be purchased and sold | bblPerDay 30,000  
Oil contracts | Brent Basis Swap Contracts for January 2024 through December 2024    
Derivative [Line Items]    
Volume, barrels per day | MMBTU / d 3,000  
Oil contracts, price per bbl | Brent Basis Swap Contracts for January 2024 through December 2024    
Derivative [Line Items]    
Price per Bbl in usd | $ / MMBTU 4.33