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Commitments and Contingencies - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Loss Contingencies [Line Items]      
Estimated litigation liability $ 75 $ 95  
Off-balance sheet risks, face amount, liability 14,300    
Rent expense, net 136 130 $ 194
Business exit costs 1 4 $ 1
Future minimum payments due $ 1,042    
Synthetic Lease      
Loss Contingencies [Line Items]      
Lessee Leasing Arrangements, Operating Leases, Term of Contract 5 years    
Future minimum payments due $ 71    
Guarantee of lease balance percentage 83.00%    
LPS Acquisition      
Loss Contingencies [Line Items]      
Estimated litigation liability $ 67 $ 84