Acquisitions (Schedule of the Allocation of Purchase Price of GEPH) (Details) - GEPH Merger - USD ($) $ in Millions		9 Months Ended
	Dec. 31, 2021	Sep. 30, 2022
Consideration:
Total consideration	$ 1,726
Fair Value of Assets Acquired:
Cash and cash equivalents	11
Accounts receivable (2)	180
Other current assets	1
Commodity derivative assets	56
Evaluated oil and gas properties	1,783
Unevaluated oil and gas properties (1)	59
Other property, plant and equipment	2
Other long-term assets	3
Total assets acquired	2,095
Fair Value of Liabilities Assumed:
Accounts payable (2)	178
Other current liabilities	1
Derivative liabilities	75
Revolving credit facility	81
Asset retirement obligations	24
Other noncurrent liabilities (2)	10
Total liabilities assumed	369
Net Assets Acquired and Liabilities Assumed	$ 1,726
Business combination, provisional information, initial accounting incomplete, adjustment, accounts receivable		$ 9
Business combination, provisional information, initial accounting incomplete, adjustment, other current asset		(2)
Business combination, provisional information, initial accounting incomplete, adjustment, account payable		8
Business combination, provisional information, initial accounting incomplete, adjustment, other noncurrent liability		$ 5