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Restructuring and Other Charges (Tables)
 9 Months Ended
Sep. 30, 2018
Restructuring and Related Activities [Abstract]  
Activity and Reserve Balances for Restructuring Charges
Activity and reserve balances for restructuring and other charges were as follows:
 
Layoff
costs
 
Other exit
costs
 
Total
Reserve balances at December 31, 2016
$
50

 
$
9

 
$
59

Cash payments
(59
)
 
(6
)
 
(65
)
Restructuring charges
64

 
1

 
65

Other(1)
1

 
(2
)
 
(1
)
Reserve balances at December 31, 2017
56

 
2

 
58

Cash payments
(37
)
 
(1
)
 
(38
)
Restructuring charges
8

 
13

 
21

Other(1)
—

 
—

 
—

Reserve balances at September 30, 2018
$
27

 
$
14

 
$
41

(1) 
Other includes reversals of previously recorded restructuring charges and credits, and the effects of foreign currency translation. In 2018, Other for layoff costs included the following: a reclassification of a $28 credit in postretirement benefits, as the impact to the liability was reflected in Arconic’s separate liability for postretirement benefits; a reclassification of $18 in pension costs, as this liability was reflected in Arconic’s separate liability for pension benefits; and reversals of $10 for previously recorded layoff charges. In 2017, Other for layoff costs included a reclassification of a stock awards reversal of $13 and reversals of $11 for previously recorded layoff reserves.