Property, Plant and Equipment, Net (Schedule Of Property, Plant And Equipment) (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Cost	$ 59,036	$ 58,322
Less: Accumulated depreciation, depletion and amortization	(49,842)	(49,561)
Property, plant and equipment, net	9,194	8,761
Operating Segments [Member] \| USA Operations [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Cost	41,852	41,041
Less: Accumulated depreciation, depletion and amortization	(33,835)	(33,418)
Property, plant and equipment, net	8,017	7,623
Operating Segments [Member] \| Canadian Operations [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Cost	16,314	16,401
Less: Accumulated depreciation, depletion and amortization	(15,313)	(15,450)
Property, plant and equipment, net	1,001	951
Operating Segments [Member] \| Market Optimization [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	0	0
Corporate & Other [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	176	187
Proved Properties [Member] \| Operating Segments [Member] \| USA Operations [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Cost	40,365	39,145
Less: Accumulated depreciation, depletion and amortization	(33,835)	(33,418)
Property, plant and equipment, net	6,530	5,727
Proved Properties [Member] \| Operating Segments [Member] \| Canadian Operations [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Cost	16,249	16,330
Less: Accumulated depreciation, depletion and amortization	(15,313)	(15,450)
Property, plant and equipment, net	936	880
Unproved Properties [Member] \| Operating Segments [Member] \| USA Operations [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Cost	1,465	1,884
Less: Accumulated depreciation, depletion and amortization	0	0
Property, plant and equipment, net	1,465	1,884
Unproved Properties [Member] \| Operating Segments [Member] \| Canadian Operations [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Cost	54	60
Less: Accumulated depreciation, depletion and amortization	0	0
Property, plant and equipment, net	54	60
Other Capitalized Property Plant and Equipment [Member] \| Operating Segments [Member] \| USA Operations [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Cost	22	12
Less: Accumulated depreciation, depletion and amortization	0	0
Property, plant and equipment, net	22	12
Other Capitalized Property Plant and Equipment [Member] \| Operating Segments [Member] \| Canadian Operations [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Cost	11	11
Less: Accumulated depreciation, depletion and amortization	0	0
Property, plant and equipment, net	11	11
Other Capitalized Property Plant and Equipment [Member] \| Operating Segments [Member] \| Market Optimization [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Cost	7	7
Less: Accumulated depreciation, depletion and amortization	(7)	(7)
Property, plant and equipment, net	0	0
Other Capitalized Property Plant and Equipment [Member] \| Corporate & Other [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Cost	863	873
Less: Accumulated depreciation, depletion and amortization	(687)	(686)
Property, plant and equipment, net	$ 176	$ 187

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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