Consolidated Balance Sheet - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents (O)	$ 1,358	$ 853
Receivables from customers	811	668
Other receivables	232	166
Inventories (I)	1,453	1,160
Fair value of derivative contracts (O)	113	51
Prepaid expenses and other current assets	271	283
Total current assets	4,238	3,181
Properties, plants, and equipment, net (J)	9,138	9,325
Investments (H)	1,410	1,358
Deferred income taxes (P)	814	741
Fair value of derivative contracts (O)	128	468
Other noncurrent assets (S)	1,719	1,668
Total Assets	17,447	16,741
Current liabilities:
Accounts payable, trade	1,898	1,455
Accrued compensation and retirement costs	459	456
Taxes, including income taxes	282	147
Fair value of derivative contracts (O)	185	35
Other current liabilities (C)	412	707
Long-term debt due within one year (L & O)	16	21
Total current liabilities	3,252	2,821
Long-term debt, less amount due within one year (L & O)	1,388	1,424
Accrued pension benefits (N)	2,341	1,851
Accrued other postretirement benefits (N)	1,100	1,166
Asset retirement obligations (Q)	617	604
Environmental remediation (R)	258	264
Fair value of derivative contracts (O)	1,105	234
Noncurrent income taxes (P)	309	310
Other noncurrent liabilities and deferred credits (S)	279	370
Total liabilities	10,649	9,044
Contingencies and commitments (R)
Alcoa Corporation shareholders' equity:
Common stock (M)	2	2
Additional capital	9,590	9,531
Retained earnings (deficit)	113	(104)
Accumulated other comprehensive loss (G)	(5,182)	(3,775)
Total Alcoa Corporation shareholders' equity	4,523	5,654
Noncontrolling interest (A)	2,275	2,043
Total equity	6,798	7,697
Total Liabilities and Equity	$ 17,447	$ 16,741

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.