Statement of Changes in Consolidated Equity - USD ($) $ in Millions	Total	Preferred Class A	Preferred stock	Common stock	Additional capital	Retained earnings (Accumulated deficit)	Retained earnings (Accumulated deficit) Preferred Class A	Accumulated other comprehensive loss	Noncontrolling Interests
Beginning balance at Dec. 31, 2019	$ 4,605		$ 55	$ 433	$ 7,319	$ 113		$ (3,329)	$ 14
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	261					261
Other comprehensive income (L)	16							16
Cash dividends declared:
Cash dividends declared, Preferred-Class A		$ (2)					$ (2)
Cash dividends declared, common	(8)					(8)
Repurchase and retirement of common stock (J)	(73)			(3)	(70)
Stock-based compensation (J)	45				45
Common stock issued: compensation plans (J)	(6)			3	(9)
Distributions to Arconic Corporation (C)	(1,261)				(2,617)			1,370	(14)
Ending balance at Dec. 31, 2020	3,577		55	433	4,668	364		(1,943)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	258					258
Other comprehensive income (L)	80							80
Cash dividends declared:
Cash dividends declared, Preferred-Class A		(2)					(2)
Cash dividends declared, common	(17)					(17)
Repurchase and retirement of common stock (J)	(430)			(13)	(417)
Stock-based compensation (J)	40				40
Common stock issued: compensation plans (J)	2			2
Ending balance at Dec. 31, 2021	3,508		55	422	4,291	603		(1,863)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	469					469
Other comprehensive income (L)	22							22
Cash dividends declared:
Cash dividends declared, Preferred-Class A		$ (2)					$ (2)
Cash dividends declared, common	(42)					(42)
Repurchase and retirement of common stock (J)	(400)			(12)	(388)
Stock-based compensation (J)	54				54
Common stock issued: compensation plans (J)	(8)			2	(10)
Ending balance at Dec. 31, 2022	$ 3,601		$ 55	$ 412	$ 3,947	$ 1,028		$ (1,841)	$ 0