Debt instrument maturity year.

No definition available.

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- Definition

Debt instrument redemption period.

+ References

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Repurchase of inventory related to agreement.

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Short term borrowings of inventory related to agreement.

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Date the debt agreement requires the first payment to be made, in YYYY-MM-DD format.

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Face (par) amount of debt instrument at time of issuance.

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Description of the frequency of periodic payments (monthly, quarterly, annual).

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Amount of contribution received by defined benefit plan from employer which increases plan assets.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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Debt - Additional Information (Detail) - USD ($) $ in Millions		1 Months Ended				12 Months Ended
	Apr. 07, 2021	Mar. 31, 2024	Mar. 31, 2021	Jul. 31, 2020	May 31, 2018	Dec. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Short-term borrowings						$ 50	$ 56
Borrowings of inventory related to agreement						88	117
Repurchase of inventory related to agreement						$ 94	$ 61
7.125% Notes, due 2031 [Member] \| Alcoa Nederland Holding BV [Member]
Debt Instrument [Line Items]
Principal amount of debt		$ 750
Senior notes, interest percentage		7.125%
Proceeds from issuance of public debt offering		$ 737
Debt instrument, frequency of periodic payment						semi-annually
Debt instrument, date of first required payment		Sep. 15, 2024
7.125% Notes, due 2031 [Member] \| Alcoa Nederland Holding BV [Member] \| After March 31, 2024 [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt instrument redemption period						10 days
7.125% Notes, due 2031 [Member] \| Alcoa Nederland Holding BV [Member] \| After March 31, 2024 [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument redemption period						60 days
Debt instrument redemption price percentage						103.563%
7.125% Notes, due 2031 [Member] \| Alcoa Nederland Holding BV [Member] \| Change in Control [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument redemption price percentage						101.00%
4.125% Notes, due 2029 [Member] \| Alcoa Nederland Holding BV [Member]
Debt Instrument [Line Items]
Principal amount of debt			$ 500
Senior notes, interest percentage			4.125%
Proceeds from issuance of public debt offering			$ 493
Debt instrument, frequency of periodic payment						semi-annually
Debt instrument, date of first required payment			Sep. 30, 2021
Debt instrument maturity date			2029
U.S. defined benefit pension plans, company's contribution			$ 500
4.125% Notes, due 2029 [Member] \| Alcoa Nederland Holding BV [Member] \| After March 31, 2024 [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt instrument redemption period						10 days
4.125% Notes, due 2029 [Member] \| Alcoa Nederland Holding BV [Member] \| After March 31, 2024 [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument redemption period						60 days
Debt instrument redemption price percentage						102.063%
4.125% Notes, due 2029 [Member] \| Alcoa Nederland Holding BV [Member] \| Change in Control [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument redemption price percentage						101.00%
6.75% Notes, due 2024 [Member] \| Alcoa Nederland Holding BV [Member]
Debt Instrument [Line Items]
Principal amount of debt	$ 750
Senior notes, interest percentage	6.75%
Debt instrument maturity date	2024
5.500% Senior Notes due 2027 [Member] \| Alcoa Nederland Holding BV [Member]
Debt Instrument [Line Items]
Principal amount of debt				$ 750
Senior notes, interest percentage				5.50%
Proceeds from issuance of public debt offering				$ 736
Debt instrument, frequency of periodic payment						semi-annually
Debt instrument, date of first required payment				Dec. 15, 2020
Debt instrument maturity date				2027
5.500% Senior Notes due 2027 [Member] \| Alcoa Nederland Holding BV [Member] \| Change in Control [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument redemption price percentage						101.00%
5.500% Senior Notes due 2027 [Member] \| Alcoa Nederland Holding BV [Member] \| After June 15, 2023 [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt instrument redemption period						15 days
5.500% Senior Notes due 2027 [Member] \| Alcoa Nederland Holding BV [Member] \| After June 15, 2023 [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument redemption period						60 days
Debt instrument redemption price percentage						102.75%
6.125% Senior Notes Due 2028 [Member] \| Alcoa Nederland Holding BV [Member]
Debt Instrument [Line Items]
Principal amount of debt					$ 500
Senior notes, interest percentage					6.125%
Proceeds from issuance of public debt offering					$ 492
Debt instrument, frequency of periodic payment						semi-annually
Debt instrument, date of first required payment					Nov. 15, 2018
Debt instrument maturity date					2028
6.125% Senior Notes Due 2028 [Member] \| Alcoa Nederland Holding BV [Member] \| Change in Control [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument redemption price percentage						101.00%
6.125% Senior Notes Due 2028 [Member] \| Alcoa Nederland Holding BV [Member] \| After May 2023 [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt instrument redemption period						30 days
6.125% Senior Notes Due 2028 [Member] \| Alcoa Nederland Holding BV [Member] \| After May 2023 [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument redemption period						60 days
Debt instrument redemption price percentage						103.063%