Organization and Summary of Significant Accounting Policies (Summary of Other Property and Equipment) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)	Dec. 31, 2021 USD ($) $ / MMBTU	Dec. 31, 2021 USD ($) $ / barrel	Dec. 31, 2021 USD ($) $ / bbl	Dec. 31, 2020 USD ($) $ / MMBTU	Dec. 31, 2020 USD ($) $ / barrel	Dec. 31, 2020 USD ($) $ / bbl	Dec. 31, 2019 $ / MMBTU	Dec. 31, 2019 $ / barrel	Dec. 31, 2019 $ / bbl
Property, Plant and Equipment [Line Items]
Oil and Gas Property, Full Cost Method, Gross	$ 33,631	$ 33,631	$ 33,631	$ 33,631	$ 27,261	$ 27,261	$ 27,261
Less: Accumulated depreciation and impairment	(319)	(319)	(319)	(319)	(311)	(311)	(311)
Total	190	190	190	190	212	212	212
Water facilities
Property, Plant and Equipment [Line Items]
Oil and Gas Property, Full Cost Method, Gross	$ 237	237	237	237	228	228	228
Water facilities | Minimum
Property, Plant and Equipment [Line Items]
Long lived assets, useful life	5 years
Water facilities | Maximum
Property, Plant and Equipment [Line Items]
Long lived assets, useful life	10 years
Gathering systems
Property, Plant and Equipment [Line Items]
Oil and Gas Property, Full Cost Method, Gross	$ 56	56	56	56	54	54	54
Gathering systems | Minimum
Property, Plant and Equipment [Line Items]
Long lived assets, useful life	15 years
Gathering systems | Maximum
Property, Plant and Equipment [Line Items]
Long lived assets, useful life	25 years
Technology infrastructure
Property, Plant and Equipment [Line Items]
Oil and Gas Property, Full Cost Method, Gross	$ 135	135	135	135	133	133	133
Technology infrastructure | Minimum
Property, Plant and Equipment [Line Items]
Long lived assets, useful life	3 years
Technology infrastructure | Maximum
Property, Plant and Equipment [Line Items]
Long lived assets, useful life	7 years
Drilling rigs and equipment
Property, Plant and Equipment [Line Items]
Long lived assets, useful life	3 years
Oil and Gas Property, Full Cost Method, Gross	$ 28	28	28	28	26	26	26
Land, buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Oil and Gas Property, Full Cost Method, Gross	$ 16	16	16	16	41	41	41
Land, buildings and leasehold improvements | Minimum
Property, Plant and Equipment [Line Items]
Long lived assets, useful life	10 years
Land, buildings and leasehold improvements | Maximum
Property, Plant and Equipment [Line Items]
Long lived assets, useful life	30 years
Other
Property, Plant and Equipment [Line Items]
Oil and Gas Property, Full Cost Method, Gross	$ 37	$ 37	$ 37	$ 37	$ 41	$ 41	$ 41
Natural Gas
Property, Plant and Equipment [Line Items]
Average sales price ($ per unit) | $ / MMBTU		3.60			1.98			2.58
Oil
Property, Plant and Equipment [Line Items]
Average sales price ($ per unit)			66.56	66.56		39.57	39.57		55.69	55.69
NGL
Property, Plant and Equipment [Line Items]
Average sales price ($ per unit)			28.65	28.65		10.27	10.27		11.58	11.58