Organization and Summary of Significant Accounting Policies (Composition of Net Unevaluated Costs Excluded from Amortization) (Details) - USD ($) $ in Millions	12 Months Ended			192 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Capitalized Costs of Unproved Properties Excluded from Amortization, Period Cost [Abstract]
Property acquisition costs	$ 86	$ 764	$ 71	$ 973
Exploration and development costs	12	11	8	14
Capitalized interest	118	75	48	37
Net unevaluated costs excluded from amortization	216	850	$ 127	$ 1,024
Capitalized Costs of Unproved Properties Excluded from Amortization, Cumulative [Abstract]
Property acquisition costs	1,894
Exploration and development costs	45
Capitalized interest	278
Net unevaluated costs excluded from amortization, cumulative	$ 2,217	$ 2,231