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Commitments, Contingent and Other Liabilities - Net Minimum Lease Commitments (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Commitments and Contingencies Disclosure [Abstract]      
Maximum lease period 25 years    
Net rental expense under operating leases $ 11 $ 13 $ 9
Minimum Rental Payments      
2014 9    
2015 5    
2016 4    
Net minimum lease commitments 18    
Minimum Sublease Income      
2014 (4)    
2015 (4)    
2016 (3)    
Net minimum lease commitments (11)    
Net      
2014 5    
2015 1    
2016 1    
Net minimum lease commitments $ 7