Financial Risk Management Activities - Gross and Net Fair Values (Detail) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Assets - Gross fair value of derivative contracts	$ 458	$ 126
Master netting arrangements	0	0
Assets - Net Fair Value of Derivative Contracts	458	126
Liabilities - Gross fair value of derivative contracts	0	(1)
Master netting arrangements	0	0
Liabilities - Net Fair Value of Derivative Contracts	0	(1)
Derivative Contracts Designated as Hedging Instruments:
Derivatives, Fair Value [Line Items]
Assets - Gross fair value of derivative contracts	456	126
Liabilities - Gross fair value of derivative contracts	0	0
Derivative Contracts Designated as Hedging Instruments: \| Commodity derivative contracts
Derivatives, Fair Value [Line Items]
Liabilities - Gross fair value of derivative contracts	0	0
Derivative Contracts Designated as Hedging Instruments: \| Commodity derivative contracts \| Crude Oil Derivative Contracts
Derivatives, Fair Value [Line Items]
Assets - Gross fair value of derivative contracts	450	125
Derivative Contracts Designated as Hedging Instruments: \| Interest rate swaps
Derivatives, Fair Value [Line Items]
Liabilities - Gross fair value of derivative contracts	0	0
Derivative Contracts Designated as Hedging Instruments: \| Interest rate swaps \| Other Assets
Derivatives, Fair Value [Line Items]
Assets - Gross fair value of derivative contracts	6	1
Derivative Contracts Not Designated as Hedging Instruments:
Derivatives, Fair Value [Line Items]
Assets - Gross fair value of derivative contracts	2	0
Liabilities - Gross fair value of derivative contracts	0	(1)
Derivative Contracts Not Designated as Hedging Instruments: \| Foreign exchange forwards \| Accounts Receivable - Joint Venture and Other
Derivatives, Fair Value [Line Items]
Assets - Gross fair value of derivative contracts	2	0
Derivative Contracts Not Designated as Hedging Instruments: \| Foreign exchange forwards \| Accounts Payable
Derivatives, Fair Value [Line Items]
Liabilities - Gross fair value of derivative contracts	$ 0	$ (1)

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and elected not to be offset.

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Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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