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Derivatives - Narrative (Details)
MMBTU / d in Thousands, MMBTU in Thousands, $ in Millions
1 Months Ended 2 Months Ended 3 Months Ended 8 Months Ended 12 Months Ended
Jan. 31, 2025
bbl / d
$ / MMBoe
bbl
Dec. 31, 2023
MMBTU / d
MMBTU
$ / bbl
$ / MMBtu
Mar. 31, 2026
bbl / d
$ / MMBoe
bbl
Mar. 31, 2025
bbl / d
$ / MMBoe
bbl
Dec. 31, 2023
$ / bbl
$ / MMBtu
bbl
Sep. 30, 2023
$ / bbl
$ / MMBtu
bbl
Jun. 30, 2023
$ / MMBtu
$ / bbl
bbl
Mar. 31, 2023
$ / bbl
$ / MMBtu
bbl
Oct. 31, 2023
MMBTU / d
MMBTU
$ / MMBtu
Dec. 31, 2025
$ / bbl
$ / MMBtu
bbl
Dec. 31, 2024
$ / MMBtu
$ / bbl
bbl
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Derivative [Line Items]                            
Target period to cover operating expenses and fixed charges (up to)                       3 years    
Target period for fixing the price natural gas purchases used in steam operations (up to)                       3 years    
Deferred premiums, remaining | $                       $ 5    
Net cash paid (received) settlements | $                       $ 88 $ 92 $ (142)
Forecast | Swaps                            
Derivative [Line Items]                            
Hedged volume (bbls) | bbl         1,196,000 1,211,717 1,387,750 1,385,278   0 3,392,048      
Weighted-average price ($/bbl)   76.18     76.18 76.26 77.01 77.15   0 76.12      
Forecast | Producer Collar, Purchased Puts                            
Derivative [Line Items]                            
Hedged volume (bbls) | bbl 3,627   472,500 270,000 368,000 368,000 364,000 360,000   2,212,500 1,098,000      
Hedged volume (bbls/d) | bbl / d 117   5,250 3,000                    
Forecast | Producer Collar, Purchased Puts | Maximum                            
Derivative [Line Items]                            
Weighted-average price ($/bbl) | $ / MMBoe 88.50   82.21 88.35                    
Forecast | Producer Collar, Purchased Puts | Minimum                            
Derivative [Line Items]                            
Weighted-average price ($/bbl) | $ / MMBoe 60.00   60.00 60.00                    
Forecast | Put Spread, Long                            
Derivative [Line Items]                            
Hedged volume (bbls) | bbl         644,000 644,000 637,000 630,000   0 1,647,000      
Forecast | Put Spread, Long | Maximum                            
Derivative [Line Items]                            
Weighted-average price ($/bbl)               50            
Forecast | Put Spread, Long | Minimum                            
Derivative [Line Items]                            
Weighted-average price ($/bbl)               40            
Forecast | Put Spread, Short                            
Derivative [Line Items]                            
Hedged volume (bbls) | bbl         92,000 92,000 91,000 90,000   0 366,000      
Forecast | Put Spread, Short | Maximum                            
Derivative [Line Items]                            
Weighted-average price ($/bbl)               50            
Forecast | Put Spread, Short | Minimum                            
Derivative [Line Items]                            
Weighted-average price ($/bbl)               40            
Forecast | NWPL/HH - basis swaps                            
Derivative [Line Items]                            
Hedged volume, terminated | MMBTU   610             4,900          
Hedged volume, terminated per day | MMBTU / d   10             20          
Weighted-average price ($/mmbtu) | $ / MMBtu   1.12     1.12 1.12 1.12 1.12 1.12 0 0