CONSOLIDATED BALANCE SHEET (Unaudited) (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Cash and cash equivalents	$ 1,022	$ 262
Receivables net of allowance	1,065	908
Other current assets	599	676
Gathering, processing and transmission facilities	668	670
Other property and equipment	1,140	1,140
Accumulated depreciation	33,744	34,810
Equity method interests	1,554	1,555
Deferred charges and other	529	526
Other current liabilities	942	862
Long-term debt	8,420	8,770
Asset retirement obligation	1,893	1,888
Other current liabilities	$ 537	$ 602
Common stock, par value (in USD per share)	$ 0	$ 0.625
Common stock, shares authorized (in shares)	0	860,000,000
Common stock, shares issued (in shares)	0	418,429,375
Treasury stock, shares (in shares)	0	40,946,745
Altus VIE
Cash and cash equivalents	$ 75	$ 24
Receivables net of allowance	99	95
Other current assets		5
Gathering, processing and transmission facilities	206	206
Other property and equipment	4	3
Accumulated depreciation	19	13
Equity method interests	1,554	1,555
Deferred charges and other	9	5
Other current liabilities	11	4
Long-term debt	657	624
Asset retirement obligation	66	64
Other current liabilities	$ 131	$ 144