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Commitments and Contingent Liabilities (Tables)
 12 Months Ended
Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract]  
Future Net Minimum Lease Commitments
Future net minimum lease commitments under noncancelable operating lease arrangements were:
Year Ending December 31,
Minimum
Rental
Payments
 
Minimum
Sublease
Income
 
Net
 
(in millions)
2013
$
8

 
$
(4
)
 
$
4

2014
8

 
(4
)
 
4

2015
7

 
(4
)
 
3

2016
5

 
(2
)
 
3

Net minimum lease commitments
$
28

 
$
(14
)
 
$
14