Accumulated Other Comprehensive Loss (Tables)

6 Months Ended

Jun. 30, 2018

Equity [Abstract]

Summary of Changes in Accumulated Other Comprehensive (Loss) by Component

The following table details the activity of the four components that comprise Accumulated other comprehensive loss for both Arconic’s shareholders and noncontrolling interests:

	Arconic						Noncontrolling Interests
Second quarter ended June 30,	2018			2017			2018		2017
Pension and other postretirement benefits (G)
Balance at beginning of period	$	(2,087	)	$	(1,979	)	$	—	$	—
Other comprehensive income:
Unrecognized net actuarial loss and prior service cost/benefit	(15		)	17			—		—
Tax benefit (expense)	3			(5		)	—		—
Total Other comprehensive (loss) income before reclassifications, net of tax	(12		)	12			—		—
Amortization of net actuarial loss and prior service cost(1)	52			56			—		—
Tax expense(2)	(11		)	(20		)	—		—
Total amount reclassified from Accumulated other comprehensive loss, net of tax(5)	41			36			—		—
Total Other comprehensive income	29			48			—		—
Balance at end of period	$	(2,058	)	$	(1,931	)	$	—	$	—
Foreign currency translation
Balance at beginning of period	$	(315	)	$	(622	)	$	—	$	(2	)
Other comprehensive (loss) income(3)	(201		)	99			—		—
Balance at end of period	$	(516	)	$	(523	)	$	—	$	(2	)
Available-for-sale securities
Balance at beginning of period	$	(2	)	$	99		$	—	$	—
Other comprehensive loss(4)	(2		)	(101		)	—		—
Balance at end of period	$	(4	)	$	(2	)	$	—	$	—
Cash flow hedges
Balance at beginning of period	$	18		$	4		$	—	$	—
Other comprehensive income (loss):
Net change from periodic revaluations	9			(4		)	—		—
Tax (expense) benefit	(1		)	1			—		—
Total Other comprehensive income (loss) before reclassifications, net of tax	8			(3		)	—		—
Net amount reclassified to earnings	(4		)	1			—		—
Tax benefit(2)	—			—			—		—
Total amount reclassified from Accumulated other comprehensive loss, net of tax(5)	(4		)	1			—		—
Total Other comprehensive income (loss)	4			(2		)	—		—
Balance at end of period	$	22		$	2		$	—	$	—
Total balance at end of period	$	(2,556	)	$	(2,454	)	$	—	$	(2	)

⁽¹⁾  These amounts were included in the computation of net periodic benefit cost for pension and other postretirement benefits (see Note G).

⁽²⁾  These amounts were included in Provision for income taxes on the accompanying Statement of Consolidated Operations.

⁽³⁾  In all periods presented, there were no tax impacts related to rate changes and no amounts were reclassified to earnings.

⁽⁴⁾  Realized gains and losses were included in Other expense (income), net on the accompanying Statement of Consolidated Operations.

⁽⁵⁾  A positive amount indicates a corresponding charge to earnings and a negative amount indicates a corresponding benefit to earnings.

	Arconic						Noncontrolling Interests
Six months ended June 30,	2018			2017			2018		2017
Pension and other postretirement benefits (G)
Balance at beginning of period	$	(2,230	)	$	(2,010	)	$	—	$	—
Other comprehensive income:
Unrecognized net actuarial loss and prior service cost/benefit	122			11			—		—
Tax expense	(28		)	(4		)	—		—
Total Other comprehensive income before reclassifications, net of tax	94			7			—		—
Amortization of net actuarial loss and prior service cost(1)	100			111			—		—
Tax expense(2)	(22		)	(39		)	—		—
Total amount reclassified from Accumulated other comprehensive loss, net of tax(5)	78			72			—		—
Total Other comprehensive income	172			79			—		—
Balance at end of period	$	(2,058	)	$	(1,931	)	$	—	$	—
Foreign currency translation
Balance at beginning of period	$	(437	)	$	(689	)	$	—	$	(2	)
Other comprehensive (loss) income(3)	(79		)	166			—		—
Balance at end of period	$	(516	)	$	(523	)	$	—	$	(2	)
Available-for-sale securities
Balance at beginning of period	$	(2	)	$	132		$	—	$	—
Other comprehensive loss(4)	(2		)	(134		)	—		—
Balance at end of period	$	(4	)	$	(2	)	$	—	$	—
Cash flow hedges
Balance at beginning of period	$	25		$	(1	)	$	—	$	—
Other comprehensive (loss) income:
Net change from periodic revaluations	3			4			—		—
Tax expense	—			(2		)	—		—
Total Other comprehensive income before reclassifications, net of tax	3			2			—		—
Net amount reclassified to earnings	(7		)	1			—		—
Tax benefit(2)	1			—			—		—
Total amount reclassified from Accumulated other comprehensive loss, net of tax(5)	(6		)	1			—		—
Total Other comprehensive (loss) income	(3		)	3			—		—
Balance at end of period	$	22		$	2		$	—	$	—
Total balance at end of period	$	(2,556	)	$	(2,454	)	$	—	$	(2	)

⁽¹⁾  These amounts were included in the computation of net periodic benefit cost for pension and other postretirement benefits (see Note G).

⁽²⁾  These amounts were included in Provision for income taxes on the accompanying Statement of Consolidated Operations.

⁽³⁾  In all periods presented, there were no tax impacts related to rate changes and no amounts were reclassified to earnings.

⁽⁴⁾  Realized gains and losses were included in Other expense (income), net on the accompanying Statement of Consolidated Operations.

⁽⁵⁾  A positive amount indicates a corresponding charge to earnings and a negative amount indicates a corresponding benefit to earnings.