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Property, Plant and Equipment, Net (Schedule of Property, Plant and Equipment) (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Cost $ 71,431 $ 67,638
Less: Accumulated depreciation, depletion and amortization (57,187) (53,274)
Property, plant and equipment, net 14,244 14,364
Operating Segments [Member] | USA Operations [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Cost 50,909 51,035
Less: Accumulated depreciation, depletion and amortization (39,296) (37,772)
Property, plant and equipment, net 11,613 13,263
Operating Segments [Member] | Canadian Operations [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Cost 19,690 15,796
Less: Accumulated depreciation, depletion and amortization (17,168) (14,826)
Property, plant and equipment, net 2,522 970
Corporate & Other [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, net 109 131
Proved Properties [Member] | Operating Segments [Member] | USA Operations [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Cost 50,573 50,246
Less: Accumulated depreciation, depletion and amortization (39,294) (37,770)
Property, plant and equipment, net 11,279 12,476
Proved Properties [Member] | Operating Segments [Member] | Canadian Operations [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Cost 19,560 15,763
Less: Accumulated depreciation, depletion and amortization (17,163) (14,821)
Property, plant and equipment, net 2,397 942
Unproved Properties [Member] | Operating Segments [Member] | USA Operations [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Cost 316 741
Less: Accumulated depreciation, depletion and amortization 0 0
Property, plant and equipment, net 316 741
Unproved Properties [Member] | Operating Segments [Member] | Canadian Operations [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Cost 118 23
Less: Accumulated depreciation, depletion and amortization 0 0
Property, plant and equipment, net 118 23
Other Capitalized Property Plant and Equipment [Member] | Operating Segments [Member] | USA Operations [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Cost 20 48
Less: Accumulated depreciation, depletion and amortization (2) (2)
Property, plant and equipment, net 18 46
Other Capitalized Property Plant and Equipment [Member] | Operating Segments [Member] | Canadian Operations [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Cost 12 10
Less: Accumulated depreciation, depletion and amortization (5) (5)
Property, plant and equipment, net 7 5
Other Capitalized Property Plant and Equipment [Member] | Corporate & Other [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Cost 832 807
Less: Accumulated depreciation, depletion and amortization (723) (676)
Property, plant and equipment, net $ 109 $ 131