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Long-Term Debt (Narrative) (Details) - USD ($)
 12 Months Ended
May 31, 2023
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Nov. 25, 2025
Debt Instrument [Line Items]          
Net proceeds of offering   $ 0 $ 0 $ 2,278,000,000  
Standby fees   8,000,000 8,000,000 8,000,000  
Interest expense on debt   365,000,000 403,000,000 343,000,000  
Aggregate cash payment for repurchased debt   $ 600,000,000 0 $ 0  
Weighted average remaining life of outstanding debt   3 years      
Issuance costs capitalized   $ 0 0    
Current portion of long-term debt   810,000,000 600,000,000    
Long-term debt carrying value   5,202,000,000 5,453,000,000    
Long-term debt, fair value   5,510,000,000 5,649,000,000    
5.375% Unsecured Notes [Member] | Unsecured Notes, Due Jan 1, 2026 [Member]          
Debt Instrument [Line Items]          
Unsecured Debt   $ 459,000,000 $ 459,000,000    
Debt Instrument, Interest Rate, Stated Percentage   5.375% 5.375%    
Debt instrument maturity date   Jan. 01, 2026 Jan. 01, 2026    
6.50% Unsecured Notes [Member] | Unsecured Notes, Due August 15, 2034 [Member]          
Debt Instrument [Line Items]          
Unsecured Debt   $ 599,000,000 $ 599,000,000    
Debt Instrument, Interest Rate, Stated Percentage   6.50% 6.50%    
Debt instrument maturity date   Aug. 15, 2034 Aug. 15, 2034    
6.50% Unsecured Notes [Member] | Unsecured Notes, Due February 1, 2038 [Member]          
Debt Instrument [Line Items]          
Unsecured Debt   $ 430,000,000 $ 430,000,000    
Debt Instrument, Interest Rate, Stated Percentage   6.50% 6.50%    
Debt instrument maturity date   Feb. 01, 2038 Feb. 01, 2038    
6.625% Unsecured Notes [Member] | Unsecured Notes, Due August 15, 2037 [Member]          
Debt Instrument [Line Items]          
Unsecured Debt   $ 390,000,000 $ 390,000,000    
Debt Instrument, Interest Rate, Stated Percentage   6.625% 6.625%    
Debt instrument maturity date   Aug. 15, 2037 Aug. 15, 2037    
5.65% Unsecured Notes [Member] | Unsecured Notes, Due May 15, 2025 [Member]          
Debt Instrument [Line Items]          
Unsecured Debt $ 600,000,000 $ 0 $ 600,000,000    
Debt Instrument, Interest Rate, Stated Percentage 5.65% 5.65% 5.65%    
Debt instrument maturity date May 15, 2025 May 15, 2025 May 15, 2025    
5.65% Unsecured Notes [Member] | Unsecured Notes, Due May 15, 2028 [Member]          
Debt Instrument [Line Items]          
Unsecured Debt $ 700,000,000 $ 700,000,000 $ 700,000,000    
Debt Instrument, Interest Rate, Stated Percentage 5.65% 5.65% 5.65%    
Debt instrument maturity date May 15, 2028 May 15, 2028 May 15, 2028    
6.25% Unsecured Notes [Member] | Unsecured Notes, Due July 15, 2033 [Member]          
Debt Instrument [Line Items]          
Unsecured Debt $ 600,000,000 $ 600,000,000 $ 600,000,000    
Debt Instrument, Interest Rate, Stated Percentage 6.25% 6.25% 6.25%    
Debt instrument maturity date Jul. 15, 2033 Jul. 15, 2033 Jul. 15, 2033    
7.10% Unsecured Notes [Member] | Unsecured Notes, Due July 15, 2053 [Member]          
Debt Instrument [Line Items]          
Unsecured Debt $ 400,000,000 $ 400,000,000 $ 400,000,000    
Debt Instrument, Interest Rate, Stated Percentage 7.10% 7.10% 7.10%    
Debt instrument maturity date Jul. 15, 2053 Jul. 15, 2053 Jul. 15, 2053    
5.15% Unsecured Notes [Member] | Unsecured Notes, Due November 15, 2041 [Member]          
Debt Instrument [Line Items]          
Unsecured Debt   $ 148,000,000 $ 148,000,000    
Debt Instrument, Interest Rate, Stated Percentage   5.15% 5.15%    
Debt instrument maturity date   Nov. 15, 2041 Nov. 15, 2041    
Permian Acquisition [Member]          
Debt Instrument [Line Items]          
Net proceeds of offering $ 2,278,000,000        
Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity   $ 3,500,000,000      
Expiration date - line of credit   Dec. 31, 2029      
Maximum number of extensions per year   1      
Maximum period of years line of credit can extended   5 years      
Additional period in days added to extension   90 days      
Line of credit facility remaining outstanding borrowings   $ 0      
Equity adjustment, cumulative historical ceiling test impairment   $ 7,700,000,000      
Revolving Credit Facility [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Financing debt-to-adjusted capitalization, percentage   0.60      
Revolving Credit Facility [Member] | Parent Company [Member]          
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity   $ 2,200,000,000      
Revolving Credit Facility [Member] | Subsidiary Issuer [Member] | Canada [Member]          
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity   1,300,000,000      
Revolving Credit Facility [Member] | Commercial Paper [Member] | United States [Member]          
Debt Instrument [Line Items]          
Current portion of long-term debt   $ 351,000,000      
Weighted average interest rate   4.37%      
2 Year Term Credit Agreement [Member]          
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity         $ 1,200,000,000