Acquisitions (Schedule of the Allocation of Purchase Price of GEPH) (Details) - GEPH Merger - USD ($) $ in Millions		6 Months Ended
	Dec. 31, 2021	Jun. 30, 2022
Consideration:
Total consideration	$ 1,722
Fair Value of Assets Acquired:
Cash and cash equivalents	11
Accounts receivable	171
Other current assets	1
Commodity derivative assets	56
Evaluated oil and gas properties	1,783
Unevaluated oil and gas properties (1)	61
Other property, plant and equipment	2
Other long-term assets	3
Total assets acquired	2,088
Fair Value of Liabilities Assumed:
Accounts payable (1)	175
Other current liabilities	1
Derivative liabilities	75
Revolving credit facility	81
Asset retirement obligations	24
Other noncurrent liabilities	10
Total liabilities assumed	366
Net Assets Acquired and Liabilities Assumed	$ 1,722
Purchase price adjustment		$ 2
Other Current Assets
Fair Value of Liabilities Assumed:
Purchase price adjustment		2
Accounts Payable
Fair Value of Liabilities Assumed:
Purchase price adjustment		5
Other Noncurrent Liabilities
Fair Value of Liabilities Assumed:
Purchase price adjustment		$ 5