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Restructuring and Other Charges (Tables)
 3 Months Ended
Mar. 31, 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
(20
)
 
—

 
(20
)
Restructuring charges
9

 
—

 
9

Other(1)
(9
)
 
—

 
(9
)
Reserve balances at March 31, 2018
$
36

 
$
2

 
$
38

(1) 
Other includes reversals of previously recorded restructuring charges and the effects of foreign currency translation.  In 2018, Other for layoff costs also included a reclassification of $5 in pension costs, as this liability was reflected in Arconic’s separate liability for pension obligations.  In 2017, Other for layoff costs also included a reclassification of a stock awards reversal of $13.