Derivatives and Other Financial Instruments - Schedule of Reconciliation of Activity for Derivative Contracts (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Financial Contracts [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value measurement, Assets, Beginning balance	$ 2
Other comprehensive (income) loss (unrealized)	20
Settlements and other	(141)
Fair value measurement, Assets, Other		$ 1
Fair value measurement, Assets, Ending balance	52	2
Fair value measurement, Liabilities, Beginning balance		1
Fair value measurement, Liabilities		$ (8)
Revenue from Contract with Customer, Product and Service [Extensible Enumeration]		Sales
Cost, Product and Service [Extensible Enumeration]		Cost of goods sold (exclusive of expenses below)
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]		Other income (expenses), net (U)
Other comprehensive (income) loss (unrealized)		$ 6
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Liability, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration]		Net change in unrecognized gains/losses on cash flow hedges
Fair value measurement, Liabilities, Other		$ 1
Other income, net		$ (1)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]		us-gaap:OtherOperatingIncomeExpenseNet
Financial Contracts [Member] | Cost of Goods Sold [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value measurement, Assets		$ (6)
Financial Contracts [Member] | Other Income Net [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value measurement, Assets	171	7
Financial Contracts [Member] | Other Income Net [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value measurement, Assets	171	5
Power Contract [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value measurement, Liabilities, Beginning balance	1,290	814
Fair value measurement, Liabilities	$ (345)	$ (277)
Revenue from Contract with Customer, Product and Service [Extensible Enumeration]	Sales	Sales
Cost, Product and Service [Extensible Enumeration]		Cost of goods sold (exclusive of expenses below)
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other income (expenses), net (U)	Other income (expenses), net (U)
Other comprehensive (income) loss (unrealized)	$ 267	$ 753
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Liability, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration]	Net change in unrecognized gains/losses on cash flow hedges	Net change in unrecognized gains/losses on cash flow hedges
Fair value measurement, Liabilities, Ending balance	$ 1,212	$ 1,290
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	us-gaap:OtherOperatingIncomeExpenseNet	us-gaap:OtherOperatingIncomeExpenseNet
Embedded Credit Derivative [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value measurement, Liabilities, Beginning balance	$ 3	$ 23
Fair value measurement, Liabilities	$ (3)	$ (20)
Revenue from Contract with Customer, Product and Service [Extensible Enumeration]	Sales	Sales
Cost, Product and Service [Extensible Enumeration]		Cost of goods sold (exclusive of expenses below)
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other income (expenses), net (U)	Other income (expenses), net (U)
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Liability, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration]	Net change in unrecognized gains/losses on cash flow hedges	Net change in unrecognized gains/losses on cash flow hedges
Fair value measurement, Liabilities, Ending balance		$ 3
Other income, net	$ (3)	$ (19)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	us-gaap:OtherOperatingIncomeExpenseNet	us-gaap:OtherOperatingIncomeExpenseNet