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Pensions and Other Postretirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2014
Other Postretirement Benefit Plan [Member]
  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Net Periodic Benefit Cost
 
Other Postretirement Benefits
 
Three Months
Ended September 30
 
Nine Months
Ended September 30
 
2014
 
2013
 
2014

 
2013

($ in millions)
 
Service cost
$
3

 
$
5

 
$
12

 
$
15

Interest cost
10

 
12

 
35

 
37

Amortization of prior service credit
(2
)
 
(2
)
 
(7
)
 
(7
)
Amortization of actuarial losses
1

 
7

 
8

 
21

Net periodic other postretirement benefit cost
$
12

 
$
22

 
$
48

 
$
66
Pension 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 and nine months ended September 30, 2014 and 2013 were as follows:
 
Pensions
 
Three Months
Ended September 30
 
Nine Months
Ended September 30
 
2014
 
2013
 
2014
 
2013
($ in millions)
 
Service cost
$
11

 
$
16

 
$
38

 
$
45

Interest cost
54

 
56

 
172

 
162

Expected return on plan assets
(76
)
 
(72
)
 
(224
)
 
(211
)
Amortization of actuarial losses
18

 
16

 
58

 
76

Amortization of prior service credit
(1
)
 
—

 
(2
)
 
—

Settlement losses
2

 
—

 
7

 
18

Net periodic pension cost
$
8

 
$
16

 
$
49

 
$
90

PPG