Financial Risk Management Activities - Gross & Net Fair Values of Financial Risk Management Derivative Instruments (Detail) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Derivatives, Fair Value [Line Items]
Assets - Gross fair value of derivative contracts	$ 0	$ 157
Liabilities - Gross fair value of derivative contracts	(6)	(1)
Gross amount offset in the Consolidate Balance Sheet, Assets	0	0
Gross amount offset in the Consolidate Balance Sheet, Liabilities	0	0
Derivative Asset	0	157
Derivative Liability	$ (6)	$ (1)
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets
Derivative Contracts Designated as Hedging Instruments:
Derivatives, Fair Value [Line Items]
Assets - Gross fair value of derivative contracts	$ 0	$ 157
Liabilities - Gross fair value of derivative contracts	(4)	0
Derivative Contracts Designated as Hedging Instruments: \| Commodity Options / Collars
Derivatives, Fair Value [Line Items]
Assets - Gross fair value of derivative contracts		155
Liabilities - Gross fair value of derivative contracts		0
Derivative Contracts Designated as Hedging Instruments: \| Interest Rate Swaps
Derivatives, Fair Value [Line Items]
Assets - Gross fair value of derivative contracts	0	2
Liabilities - Gross fair value of derivative contracts	(4)	0
Derivative Contracts Not Designated as Hedging Instruments:
Derivatives, Fair Value [Line Items]
Assets - Gross fair value of derivative contracts	0	0
Liabilities - Gross fair value of derivative contracts	(2)	(1)
Derivative Contracts Not Designated as Hedging Instruments: \| Foreign Exchange Forwards / Swaps
Derivatives, Fair Value [Line Items]
Assets - Gross fair value of derivative contracts	0	0
Liabilities - Gross fair value of derivative contracts	$ (2)	$ (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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