Contingencies and Commitments (Details) € in Millions, $ in Millions		1 Months Ended	3 Months Ended			12 Months Ended
	Mar. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)	Mar. 31, 2023 USD ($) location	Mar. 31, 2023 EUR (€) location	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($)	Jun. 26, 2020 USD ($) entity derivative
Loss Contingencies [Line Items]
Number of cleanup locations | location			30	30
Remediation reserve balance		$ 16	$ 17			$ 16
Remediation reserve balance, classified as a current liability		6	7			6
Payments related to remediation expenses applied against the reserve (less than)			1
Assessment amount			19	€ 18
Income tax reserve			20	€ 19	$ 0
Judgement from legal proceedings	$ 74
Guarantees of third party related to project financing			13
Combined fair value of guarantees		6	6			6
Coverage limit		80
Total amount committed under outstanding surety bonds			43
Surety bonds, amount outstanding			22
Bank Loan Obligations
Loss Contingencies [Line Items]
Letters of credit, total amount			119
Other Noncurrent Liabilities and Deferred Credits | Separation Agreement
Loss Contingencies [Line Items]
Guarantees of third party related to project financing		$ 1,040	1,040			$ 1,040
Lehman Brothers International (Europe) (“LBIE”) Claims
Loss Contingencies [Line Items]
Number of entities | entity							2
Number of derivative transactions | derivative							2
Estimate of claim							$ 64
Extension period						3 years
Amount reserved			65
Alcoa Corporation Workers Compensation Claims
Loss Contingencies [Line Items]
Letters of credit, total amount outstanding			52
Arconic Corporation Environmental Obligations
Loss Contingencies [Line Items]
Letters of credit, total amount outstanding			$ 17
Maximum | Recurring Costs of Managing Hazardous Substances and Environmental Programs
Loss Contingencies [Line Items]
Percentage of cost of goods sold (percent)			1.00%	1.00%