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Commitments and Contingent Liabilities
 12 Months Ended
Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract]  
Commitments and Contingent Liabilities
Commitments and Contingent Liabilities
 
Lease Obligations We lease certain offices, buildings and equipment for periods which generally do not exceed 25 years. The leases have various renewal options. The office space leases generally require us to pay certain operating expenses. Net rental expense under operating leases was $13 million, $9 million and $18 million in 2012, 2011 and 2010. See Note 18, “Related Party Transactions,” for additional information.
We have lease obligations on certain office space which has been subleased through the end of the lease period. Under these agreements, the sublessee has assumed future rental obligations on the lease.
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