Supplemental Cash Flow Information (Detail) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017
Cash paid (received)
Interest, net of amounts capitalized	$ 813	$ 764
Income taxes, net of refunds	48	169
Non-cash investing activities
Fair value of properties and equipment acquired	8	619
Asset retirement cost additions	261	228
Accruals of property, plant, and equipment	886	786
Net liabilities assumed (divested) in acquisitions and divestitures	(97)	(115)
Non-cash investing and financing activities
Deferred drilling lease liability	0	14
Settlement of tangible equity units	$ 300	$ 0

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Future cash outflow to pay for drilling rig expenditures that have occurred.

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The fair value of liabilities assumed (divested) in noncash investing or financing activities, net.

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Non-cash asset retirement cost additions incurred during the period.

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Settlement of Tangible Equity Units

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Future cash outflow to pay for purchases of fixed assets that have occurred.

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The fair value of assets acquired in noncash investing or financing activities.

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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Amount of cash paid for interest, excluding capitalized interest, classified as operating activity. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.

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