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Pensions and Other Postretirement Benefits (Tables) (Pension Plans, Defined Benefit [Member])
 3 Months Ended
Mar. 31, 2013
Pension Plans, Defined Benefit [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, 2013 and 2012 were as follows:
 
Pensions
 
Other Postretirement Benefits
 
Three Months
Ended March 31
 
Three Months
Ended March 31
 
2013
 
2012
 
2013
 
2012
 
(Millions)
 
(Millions)
Service cost
$
15

 
$
15

 
$
5

 
$
5

Interest cost
52

 
56

 
12

 
14

Expected return on plan assets
(64
)
 
(67
)
 
—

 
—

Amortization of prior service credit
—

 
—

 
(2
)
 
(1
)
Amortization of actuarial losses
28

 
32

 
7

 
9

Settlement losses
18

 
—

 
—

 
—

Net periodic pension cost
$
49

 
$
36

 
$
22

 
$
27

PPG