Debt	3 Months Ended
Mar. 31, 2021
Debt Disclosure [Abstract]
Debt	K. Debt Credit Facilities. Revolving Credit Facility On March 4, 2021 (the Amendment No. 4 Effective Date), Alcoa Corporation and Alcoa Nederland Holding B.V. (ANHBV), a wholly-owned subsidiary of the Company, entered into an amendment (Amendment No. 4) to the Revolving Credit Facility (as amended, Revolving Credit Facility) that provides additional flexibility to the Company and ANHBV by (i) increasing the maximum leverage ratio from 2.50 to 1.00 to 2.75 to 1.00 as of the Amendment No. 4 Effective Date (which maximum leverage ratio had been temporarily increased to 3.00 to 1.00 prior to the Amendment No. 4 Effective Date), (ii) decreasing the minimum interest expense coverage ratio from 5.00 to 1.00 to 4.00 to 1.00 as of the Amendment No. 4 Effective Date, (iii) amending the definition of Total Indebtedness (as defined in the Revolving Credit Facility) to permit the Company to exclude the principal amount of new senior notes issued during 2021 from indebtedness for purposes of the calculation of the leverage ratio in fiscal year 2021 (subject to adjustments based on pension obligations funded), and (iv) ending temporary restrictions on the Company’s ability to make certain restricted payments or incur incremental loans under the Revolving Credit Facility. Amendment No. 4 also (i) provides additional debt capacity to permit the Company to issue up to $750 million in aggregate principal amount of new senior notes prior to the end of fiscal year 2021 and (ii) a corresponding increase in the maximum leverage ratio commensurate with the increase in leverage resulting from the issuance of such notes up to the amount of pension obligations funded after the issuance of such notes but prior to December 31, 2021, which increase shall in any event not be in excess of the principal amount of such notes. Such additional increase in the maximum leverage ratio will be available beginning in the first quarter of 2022. The Revolving Credit Facility provides a $1,500 senior secured revolving credit facility to be used for working capital and/or other general corporate purposes of Alcoa Corporation and its subsidiaries. In the fourth quarter of 2020, ANHBV elected to extend the period under which temporary adjustments in Amendment No. 3 would apply, through March 31, 2021. The amendment temporarily adjusted the manner in which Consolidated Cash Interest Expense and Total Indebtedness (as defined in the Revolving Credit Facility) are calculated with respect to the 5.500% Senior Notes due 2027 issued in July 2020. In addition, this election to extend the temporary amendments resulted in a reduction of the aggregate amount of commitments under the Revolving Credit Facility by approximately $245 during the first quarter of 2021, to $1,255. At March 31, 2021, the maximum additional borrowing capacity available to the Company to remain in compliance with the maximum leverage ratio covenant in the Revolving Credit Facility was approximately $1,687. Therefore, the Company may access the entire amount of commitments under the Revolving Credit Facility. As of March 31, 2021, Alcoa Corporation was in compliance with all covenants. There were no borrowings outstanding at March 31, 2021, and there were no amounts borrowed during the first quarter of 2021 related to this facility. 144A Debt. In March 2021, ANHBV, completed a Rule 144A (U.S. Securities Act of 1933, as amended) debt issuance for $500 aggregate principal amount of 4.125% Senior Notes due 2029 (the 2029 Notes). The net proceeds of this issuance were approximately $493 reflecting a discount to the initial purchasers of the 2029 Notes, as well as issuance costs. The Company used the net proceeds, together with cash on hand, to contribute $500 to its U.S. defined benefit pension plans applicable to salaried and hourly employees on April 1, 2021, and to redeem in full $750 aggregate principal amount of the Company’s outstanding 6.75% Senior Notes due 2024 (the 2024 Notes) on April 7, 2021, and to pay transaction-related fees and expenses. The discount to the initial purchasers, as well as costs to complete the financing, were deferred and are being amortized to interest expense over the term of the 2029 Notes. Interest on the 2029 Notes is paid semi-annually in March and September, and interest payments will commence September 30, 2021. The indenture contains customary affirmative and negative covenants that are similar to those included in the indenture from the 5.500% Senior Notes due 2027 issued in July 2020, such as limitations on liens, limitations on sale and leaseback transactions, a prohibition on a reduction in the ownership of AWAC entities below an agreed level, and the calculation of certain financial ratios. ANHBV has the option to redeem the 2029 Notes on at least 10 days, but not more than 60 days, prior notice to the holders of the 2029 Notes under multiple scenarios, including, in whole or in part, at any time or from time to time after March 31, 2024, at a redemption price specified in the indenture (up to 102.063% of the principal amount plus any accrued and unpaid interest in each case). Also, the 2029 Notes are subject to repurchase upon the occurrence of a change in control repurchase event (as defined in the indenture) at a repurchase price in cash equal to 101% of the aggregate principal amount of the 2029 Notes repurchased, plus any accrued and unpaid interest on the 2029 Notes repurchased. The 2029 Notes rank equally in right of payment with all of ANHBV’s existing and future senior unsecured indebtedness, including the Senior Notes with maturities in 2024 (redeemed on April 7, 2021), 2026, 2027 and 2028; rank senior in right of payment to any future subordinated obligations of ANHBV; and are effectively subordinated to ANHBV’s existing and future secured indebtedness, including under the Revolving Credit Agreement, to the extent of the value of property and assets securing such indebtedness. See Note M to the Consolidated Financial Statements in Part II Item 8 of the 2020 Annual Report on Form 10-K for additional information related to ANHBV’s existing debt and related covenants. Redemption. On April 7, 2021 (the Redemption Date), the Company redeemed in full $750 aggregate principal amount of the 2024 Notes at a redemption price equal to 103.375% of the principal amount of the 2024 Notes, plus accrued and unpaid interest to but not including the Redemption Date. As of March 31, 2021, the 2024 Notes were classified as Long-term debt, due within one year as an irrevocable commitment to redeem the Notes existed. The issuance of the 2029 Notes and the redemption of the 2024 Notes were determined to be an issuance of new debt and an extinguishment of existing debt. As a result, the Company will record a loss of $32 on the extinguishment of debt in the second quarter of 2021 in Interest expense, which is comprised of the redemption premium, the write-off of deferred financing fees and unamortized debt issuance costs. The cash flows related to the transaction will be classified as financing cash flows.

Debt

3 Months Ended

Mar. 31, 2021

K. Debt

Credit Facilities.

Revolving Credit Facility

On March 4, 2021 (the Amendment No. 4 Effective Date), Alcoa Corporation and Alcoa Nederland Holding B.V. (ANHBV), a wholly-owned subsidiary of the Company, entered into an amendment (Amendment No. 4) to the Revolving Credit Facility (as amended, Revolving Credit Facility) that provides additional flexibility to the Company and ANHBV by (i) increasing the maximum leverage ratio from 2.50 to 1.00 to 2.75 to 1.00 as of the Amendment No. 4 Effective Date (which maximum leverage ratio had been temporarily increased to 3.00 to 1.00 prior to the Amendment No. 4 Effective Date), (ii) decreasing the minimum interest expense coverage ratio from 5.00 to 1.00 to 4.00 to 1.00 as of the Amendment No. 4 Effective Date, (iii) amending the definition of Total Indebtedness (as defined in the Revolving Credit Facility) to permit the Company to exclude the principal amount of new senior notes issued during 2021 from indebtedness for purposes of the calculation of the leverage ratio in fiscal year 2021 (subject to adjustments based on pension obligations funded), and (iv) ending temporary restrictions on the Company’s ability to make certain restricted payments or incur incremental loans under the Revolving Credit Facility.

Amendment No. 4 also (i) provides additional debt capacity to permit the Company to issue up to $750 million in aggregate principal amount of new senior notes prior to the end of fiscal year 2021 and (ii) a corresponding increase in the maximum leverage ratio commensurate with the increase in leverage resulting from the issuance of such notes up to the amount of pension obligations funded after the issuance of such notes but prior to December 31, 2021, which increase shall in any event not be in excess of the principal amount of such notes. Such additional increase in the maximum leverage ratio will be available beginning in the first quarter of 2022.

The Revolving Credit Facility provides a $1,500 senior secured revolving credit facility to be used for working capital and/or other general corporate purposes of Alcoa Corporation and its subsidiaries. In the fourth quarter of 2020, ANHBV elected to extend the period under which temporary adjustments in Amendment No. 3 would apply, through March 31, 2021. The amendment temporarily adjusted the manner in which Consolidated Cash Interest Expense and Total Indebtedness (as defined in the Revolving Credit Facility) are calculated with respect to the 5.500% Senior Notes due 2027 issued in July 2020. In addition, this election to extend the temporary amendments resulted in a reduction of the aggregate amount of commitments under the Revolving Credit Facility by approximately $245 during the first quarter of 2021, to $1,255.

At March 31, 2021, the maximum additional borrowing capacity available to the Company to remain in compliance with the maximum leverage ratio covenant in the Revolving Credit Facility was approximately $1,687. Therefore, the Company may access the entire amount of commitments under the Revolving Credit Facility. As of March 31, 2021, Alcoa Corporation was in compliance with all covenants. There were no borrowings outstanding at March 31, 2021, and there were no amounts borrowed during the first quarter of 2021 related to this facility.

144A Debt.

In March 2021, ANHBV, completed a Rule 144A (U.S. Securities Act of 1933, as amended) debt issuance for $500 aggregate principal amount of 4.125% Senior Notes due 2029 (the 2029 Notes). The net proceeds of this issuance were approximately $493 reflecting a discount to the initial purchasers of the 2029 Notes, as well as issuance costs. The Company used the net proceeds, together with cash on hand, to contribute $500 to its U.S. defined benefit pension plans applicable to salaried and hourly employees on April 1, 2021, and to redeem in full $750 aggregate principal amount of the Company’s outstanding 6.75% Senior Notes due 2024 (the 2024 Notes) on April 7, 2021, and to pay transaction-related fees and expenses.

The discount to the initial purchasers, as well as costs to complete the financing, were deferred and are being amortized to interest expense over the term of the 2029 Notes. Interest on the 2029 Notes is paid semi-annually in March and September, and interest payments will commence September 30, 2021. The indenture contains customary affirmative and negative covenants that are similar to those included in the indenture from the 5.500% Senior Notes due 2027 issued in July 2020, such as limitations on liens, limitations on sale and leaseback transactions, a prohibition on a reduction in the ownership of AWAC entities below an agreed level, and the calculation of certain financial ratios.

ANHBV has the option to redeem the 2029 Notes on at least 10 days, but not more than 60 days, prior notice to the holders of the 2029 Notes under multiple scenarios, including, in whole or in part, at any time or from time to time after March 31, 2024, at a redemption price specified in the indenture (up to 102.063% of the principal amount plus any accrued and unpaid interest in each case). Also, the 2029 Notes are subject to repurchase upon the occurrence of a change in control repurchase event (as defined in the indenture) at a repurchase price in cash equal to 101% of the aggregate principal amount of the 2029 Notes repurchased, plus any accrued and unpaid interest on the 2029 Notes repurchased.

The 2029 Notes rank equally in right of payment with all of ANHBV’s existing and future senior unsecured indebtedness, including the Senior Notes with maturities in 2024 (redeemed on April 7, 2021), 2026, 2027 and 2028; rank senior in right of payment to any future subordinated obligations of ANHBV; and are effectively subordinated to ANHBV’s existing and future secured indebtedness, including under the Revolving Credit Agreement, to the extent of the value of property and assets securing such indebtedness. See Note M to the Consolidated Financial Statements in Part II Item 8 of the 2020 Annual Report on Form 10-K for additional information related to ANHBV’s existing debt and related covenants.

Redemption. On April 7, 2021 (the Redemption Date), the Company redeemed in full $750 aggregate principal amount of the 2024 Notes at a redemption price equal to 103.375% of the principal amount of the 2024 Notes, plus accrued and unpaid interest to but not including the Redemption Date. As of March 31, 2021, the 2024 Notes were classified as Long-term debt, due within one year as an irrevocable commitment to redeem the Notes existed.

The issuance of the 2029 Notes and the redemption of the 2024 Notes were determined to be an issuance of new debt and an extinguishment of existing debt. As a result, the Company will record a loss of $32 on the extinguishment of debt in the second quarter of 2021 in Interest expense, which is comprised of the redemption premium, the write-off of deferred financing fees and unamortized debt issuance costs. The cash flows related to the transaction will be classified as financing cash flows.