v3.26.1
Long-Term Debt (Narrative) (Details)
$ in Millions, $ in Billions
3 Months Ended 12 Months Ended
Feb. 03, 2026
USD ($)
Feb. 03, 2026
CAD ($)
Mar. 31, 2026
USD ($)
Mar. 31, 2025
USD ($)
Dec. 31, 2025
USD ($)
Nov. 25, 2025
USD ($)
Debt Instrument [Line Items]            
Long-term debt current     $ 877   $ 810  
Drawn from revolving credit facilities     53      
Redeemption of unsecured senior notes     459 $ 0    
Long-term debt carrying value     6,398   5,202  
Long-term debt, fair value     6,612   $ 5,510  
NuVista Energy Ltd [Member]            
Debt Instrument [Line Items]            
Cash paid for acquisition $ 1,204 $ 1.6        
Two Year Term Credit Agreement [Member]            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity           $ 1,200
Term Credit Agreement [Member]            
Debt Instrument [Line Items]            
Long-term debt current     $ 1,129      
5.65% Unsecured Notes [Member] | Unsecured Notes, Due May 15, 2028 [Member]            
Debt Instrument [Line Items]            
Debt instrument maturity date     May 15, 2028   May 15, 2028  
Debt Instrument, Interest Rate, Stated Percentage     5.65%   5.65%  
Commercial Paper [Member]            
Debt Instrument [Line Items]            
Long-term debt current     $ 824      
Weighted average interest rate     4.34%