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Compensation and Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2012
Pension Plans
  
Defined Benefit Plan Disclosure [Line Items]  
Expense Components for Plans
The following were components of pension expense:
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
(in millions)
2012
 
2011
 
2012
 
2011
Service cost
$
4

 
$
5

 
$
9

 
$
9

Interest cost
4

 
3

 
7

 
7

Expected return on plan assets
(4
)
 
(3
)
 
(7
)
 
(6
)
Net amortization
2

 
1

 
3

 
2

Total expense
$
6

 
$
6

 
$
12

 
$
12
Postretirement Benefits Other Than Pensions
  
Defined Benefit Plan Disclosure [Line Items]  
Expense Components for Plans
The following were components of postretirement benefits expense:
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
(in millions)
2012
 
2011
 
2012
 
2011
Service cost
$
1

 
$
1

 
$
2

 
$
2

Interest cost
1

 
1

 
3

 
3

Net amortization
1

 
—

 
1

 
—

Total expense
$
3

 
$
2

 
$
6

 
$
5