CONSOLIDATED BALANCE SHEET (Unaudited) (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Cash and cash equivalents	$ 327	$ 714
Inventories	438	401
Gathering, transmission and processing facilities	1,958	1,856
Other	1,154	1,120
Less: Accumulated depreciation, depletion, and amortization	(28,654)	(28,335)
Equity method interests	209	121
Current debt	339	151
Other current liabilities	1,356	1,341
Asset retirement obligation	$ 1,879	$ 1,866
Common stock, par value (in USD per share)	$ 0.625	$ 0.625
Common stock, shares authorized (in shares)	860,000,000	860,000,000
Common stock, shares issued (in shares)	416,874,466	415,692,116
Treasury stock, shares (in shares)	40,964,193	40,995,894
Altus VIE
Cash and cash equivalents	$ 177	$ 450
Inventories	6	6
Gathering, transmission and processing facilities	1,353	1,251
Other	38	0
Less: Accumulated depreciation, depletion, and amortization	(32)	(24)
Equity method interests	209	91
Current debt	29	0
Other current liabilities	72	85
Asset retirement obligation	$ 30	$ 29