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Employee Benefits (Tables)
 9 Months Ended
Sep. 30, 2012
Compensation and Retirement Disclosure [Abstract]  
Components of net periodic cost for defined benefit plans and post-retirement healthcare and other benefits plan
The components of net periodic benefit cost for our retirement plans and post-retirement plans for the periods ended September 30 are as follows: 
(in millions)
Three Months
 
Nine Months
 
2012
 
2011
 
2012
 
2011
Retirement Plans
 
 
 
 
 
 
 
Service cost
$
3

 
$
16

 
$
21

 
$
50

Interest cost
24

 
25

 
70

 
75

Expected return on plan assets
(31
)
 
(32
)
 
(93
)
 
(96
)
Amortization of actuarial loss
8

 
8

 
24

 
23

Net periodic benefit cost
$
4

 
$
17

 
$
22

 
$
52


Post-Retirement Plans
 
 
 
 
 
 
 
Service cost
$
1

 
$
1

 
$
2

 
$
2

Interest cost
1

 
2

 
4

 
5

Amortization of prior service credit
—

 
(1
)
 
(1
)
 
(1
)
Net periodic benefit cost
$
2

 
$
2

 
$
5

 
$
6