v3.20.2

Inventories (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		9 Months Ended
	Jan. 01, 2019	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Inventory [Line Items]
Separation-related adjustments (A)		$ 8		$ 324
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest		85	$ 22	94	$ 69
Inventories (K)		901		901		$ 1,137
Deferred income taxes		12		12		159
Parent Company net investment (A)		0		0		2,664
Net income (loss)		5	(24)	(45)	9
Deferred income taxes				28	11
Decrease (Increase) in inventories				197	(30)
Cost of goods sold (exclusive of expenses below) (K)		1,218	1,565	3,614	4,849
Operating Income (Loss)		64	22	126	137
Income before income taxes		15	(7)	(40)	55
Provision for income taxes (H)		10	17	5	46
Net Income (Loss) Attributable to Parent		$ 5	$ (24)	$ (45)	$ 9
Basic (in dollars per share)		$ 0.05	$ (0.22)	$ (0.41)	$ 0.08
Diluted (in dollars per share)		$ 0.05	$ (0.22)	$ (0.41)	$ 0.08
Deferred income taxes		$ 296		$ 296		14
Additional capital		3,332		3,332		0
Accumulated deficit		(91)		(91)		0
Finished goods		242		242		237
Work-in-process		525		525		746
Purchased raw materials		66		66		85
Operating supplies		68		68		69
Inventory, gross		901		901		1,137
Previously Reported [Member]
Inventory [Line Items]
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest			$ 39		$ 99
Inventories (K)						820
Deferred income taxes						87
Parent Company net investment (A)						2,419
Net income (loss)			(7)		39
Deferred income taxes					20
Decrease (Increase) in inventories					(69)
Cost of goods sold (exclusive of expenses below) (K)			1,543		4,810
Operating Income (Loss)			44		176
Income before income taxes			15		94
Provision for income taxes (H)			22		55
Net Income (Loss) Attributable to Parent			$ (7)		$ 39
Basic (in dollars per share)			$ (0.07)		$ 0.35
Diluted (in dollars per share)			$ (0.07)		$ 0.35
Revision of Prior Period, Change in Accounting Principle, Adjustment
Inventory [Line Items]
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest			$ (17)		$ (30)
Inventories (K)						317
Deferred income taxes						72
Parent Company net investment (A)						$ 245
Net income (loss)			(17)		(30)
Deferred income taxes					(9)
Decrease (Increase) in inventories					39
Cost of goods sold (exclusive of expenses below) (K)			22		39
Operating Income (Loss)			(22)		(39)
Income before income taxes			(22)		(39)
Provision for income taxes (H)			(5)		(9)
Net Income (Loss) Attributable to Parent			$ (17)		$ (30)
Basic (in dollars per share)			$ (0.15)		$ (0.27)
Diluted (in dollars per share)			$ (0.15)		$ (0.27)
Change in Accounting Principle, Other
Inventory [Line Items]
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest		75		102
Inventories (K)		591		591
Net income (loss)		(5)		(37)
Deferred income taxes				29
Decrease (Increase) in inventories				188
Cost of goods sold (exclusive of expenses below) (K)		1,232		3,605
Operating Income (Loss)		50		135
Income before income taxes		1		(31)
Provision for income taxes (H)		6		6
Net Income (Loss) Attributable to Parent		$ (5)		$ (37)
Basic (in dollars per share)		$ (0.05)		$ (0.34)
Diluted (in dollars per share)		$ (0.05)		$ (0.34)
Deferred income taxes		$ 366		$ 366
Additional capital		3,098		3,098
Accumulated deficit		(97)		(97)
Change In Accounting Principle, Adjustment
Inventory [Line Items]
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest		10		(8)
Inventories (K)		310		310
Net income (loss)		10		(8)
Deferred income taxes				(1)
Decrease (Increase) in inventories				9
Cost of goods sold (exclusive of expenses below) (K)		(14)		9
Operating Income (Loss)		14		(9)
Income before income taxes		14		(9)
Provision for income taxes (H)		4		(1)
Net Income (Loss) Attributable to Parent		$ 10		$ (8)
Basic (in dollars per share)		$ 0.10		$ (0.07)
Diluted (in dollars per share)		$ 0.10		$ (0.07)
Deferred income taxes		$ (70)		$ (70)
Additional capital		234		234
Accumulated deficit		6		6
Parent Company net investment
Inventory [Line Items]
Separation-related adjustments (A)				2,548
Net income (loss)		0	$ (24)	46	$ 9
Parent Company net investment | Revision of Prior Period, Change in Accounting Principle, Adjustment
Inventory [Line Items]
Separation-related adjustments (A)	$ 293
Arconic Corporation
Inventory [Line Items]
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest		85	22	94	69
Net income (loss)		5	(24)	(45)	9
Arconic Corporation | Previously Reported [Member]
Inventory [Line Items]
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest			39		99
Arconic Corporation | Revision of Prior Period, Change in Accounting Principle, Adjustment
Inventory [Line Items]
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest			$ (17)		$ (30)
Arconic Corporation | Change in Accounting Principle, Other
Inventory [Line Items]
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest		75		102
Arconic Corporation | Change In Accounting Principle, Adjustment
Inventory [Line Items]
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest		$ 10		$ (8)

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Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock.

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The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

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