Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 1,442	$ 631
Restricted Cash, Current	59	74
Accounts receivable:
Trade, net	695	1,032
Due from affiliates	0	3
Income taxes receivable	4	7
Inventories	224	205
Derivatives	5	32
Investment in affiliate	123	187
Other	43	20
Total current assets	2,595	2,191
Oil and gas properties, using the successful efforts method of accounting:
Proved properties	23,934	22,444
Unproved properties	576	584
Accumulated depletion, depreciation and amortization	(10,071)	(8,583)
Total oil and gas properties, net	14,439	14,445
Property, Plant and Equipment, Net	1,584	1,632
Operating lease right-of-use assets	197	280
Goodwill	261	261
Other assets	150	258
Total Assets	19,229	19,088
Accounts payable:
Trade	928	1,221
Due to affiliates	102	190
Interest payable	35	53
Income taxes payable	4	3
Long-term Debt, Current Maturities	140	450
Derivatives	234	12
Operating Lease, Liability, Current	100	136
Other	363	431
Total current liabilities	1,906	2,496
Long-term Debt, Excluding Current Maturities	3,160	1,839
Derivatives	66	8
Deferred income taxes	1,366	1,393
Operating Lease, Liability, Noncurrent	110	170
Other liabilities	1,052	1,046
Equity:
Common stock, $.01 par value; 500,000,000 shares authorized; 175,525,268 and 175,057,889 shares issued as of December 31, 2020 and 2019, respectively	2	2
Additional paid-in capital	9,323	9,161
Treasury stock, at cost; 11,047,856 and 9,511,248 shares as of December 31, 2020 and 2019, respectively	(1,234)	(1,069)
Retained earnings	3,478	4,042
Total equity	11,569	12,136
Commitments and contingencies
Total Liabilities and Stockholders' Equity	$ 19,229	$ 19,088