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Operating Leases, Commitments and Contingencies, and Guarantees (Tables)
 12 Months Ended
Dec. 31, 2012
Operating Leases, Commitments and Contingencies, and Guarantees [Abstract]  
Future minimum lease payments and sublease receipts
Future Minimum Lease Payments and Sublease Receipts
(In millions)
Future Minimum Lease Payments
 
Future Minimum Sublease Receipts
2013
$
39

 
$
2

2014
33

 
—

2015
25

 
—

2016
24

 
—

2017
17

 
—

Thereafter
72

 
—

Total
$
210

 
$
2