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Pensions and Other Postretirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2012
Pension Plans, Defined Benefit [Member]
  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Net Periodic Benefit Cost
The net periodic benefit costs for the three and nine months ended September 30, 2012 and 2011 were as follows:
 
 
Pensions
 
Three Months
Ended September 30
 
Nine Months Ended September 30
 
2012
 
2011
 
2012
 
2011
 
(Millions)
Service cost
$
16

 
$
16

 
$
48

 
$
48

Interest cost
61

 
64

 
183

 
192

Expected return on plan assets
(74
)
 
(77
)
 
(224
)
 
(234
)
Amortization of actuarial losses
39

 
31

 
115

 
91

Curtailment (gains) losses
—

 
—

 
—

 
4

Net periodic pension cost
$
42

 
$
34

 
$
122

 
$
101
Other Postretirement Benefit Plans, Defined Benefit [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
 
2012
 
2011
 
2012
 
2011
 
(Millions)
Service cost
$
5

 
$
5

 
$
16

 
$
14

Interest cost
14

 
15

 
43

 
47

Amortization of prior service credit
(3
)
 
(3
)
 
(9
)
 
(9
)
Amortization of actuarial losses
8

 
8

 
25

 
23

Net periodic other postretirement benefit cost
$
24

 
$
25

 
$
75

 
$
75