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Pensions and Other Postretirement Benefits (Tables) (Other Postretirement Benefit Plan [Member])
 3 Months Ended
Mar. 31, 2015
Other Postretirement Benefit Plan [Member]
  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Net Periodic Benefit Cost
net periodic benefit costs for the three months ended March 31, 2015 and 2014 were as follows:
 
Pensions
 
Other Postretirement Benefits
 
Three Months
Ended March 31
 
Three Months
Ended March 31
 
2015
 
2014
 
2015
 
2014
($ in millions)
 
Service cost
$
15

 
$
13

 
$
5

 
$
4

Interest cost
50

 
59

 
12

 
12

Expected return on plan assets
(70
)
 
(74
)
 
—

 
—

Amortization of actuarial losses (gains)
30

 
20

 
8

 
(2
)
Amortization of prior service (credit) cost
(1
)
 
—

 
(3
)
 
4

Net periodic cost
$
24

 
$
18

 
$
22

 
$
18

PPG