Financial Risk Management Activities - Fair Values of Financial Risk Management Derivative Instruments (Detail) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Derivatives, Fair Value [Line Items]
Assets - Gross fair value of derivative contracts	$ 173	$ 0
Liabilities - Gross fair value of derivative contracts	(5)	(6)
Assets - Gross amounts offset in the Consolidated Balance Sheet	0	0
Liabilities - Gross amounts offset in the Consolidated Balance Sheet	0	0
Derivative assets	173	0
Derivative liabilities	(5)	(6)
Derivative Contracts Designated as Hedging Instruments:
Derivatives, Fair Value [Line Items]
Assets - Gross fair value of derivative contracts	173	0
Liabilities - Gross fair value of derivative contracts	(3)	(4)
Derivative Contracts Designated as Hedging Instruments: | Commodity Options / Collars
Derivatives, Fair Value [Line Items]
Assets - Gross fair value of derivative contracts	173
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	0
Liabilities - Gross fair value of derivative contracts	(3)	(4)
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)	(2)
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)	$ (2)