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Employee Benefits (Tables)
 6 Months Ended
Jun. 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 June 30 are as follows:
 
(in millions)
Three Months Ended
 
Six Months Ended
 
2012
 
2011
 
2012
 
2011
Retirement Plans
 
 
 
 
 
 
 
Service cost
$
(1
)
 
$
16

 
$
18

 
$
34

Interest cost
23

 
25

 
46

 
50

Expected return on plan assets
(31
)
 
(32
)
 
(62
)
 
(64
)
Amortization of actuarial loss
8

 
8

 
16

 
15

Net periodic benefit cost
$
(1
)
 
$
17

 
$
18

 
$
35


Post-Retirement Plans
 
 
 
 
 
 
 
Service cost
$
—

 
$
1

 
$
1

 
$
1

Interest cost
2

 
1

 
3

 
3

Amortization of prior service credit
(1
)
 
—

 
(1
)
 
—

Net periodic benefit cost
$
1

 
$
2

 
$
3

 
$
4