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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Principles of Consolidation      
Maximum percentage of voting interest required to be held to be accounted for, under the cost method 20.00%    
Financing Receivables      
Nonaccrual status period for loans 90 days    
Period for charging off revolving unsecured consumer lines 180 days    
Period for charging off closed-end consumer loans, other than loans secured by one to four family properties 120 days    
Land, Buildings, Equipment and Software      
Land, buildings, equipment and software, net of accumulated depreciation $ 607 $ 724  
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment 1,800 1,600  
Depreciation and amortization expense for the year $ 149 $ 150 $ 144
Minimum [Member]      
Principles of Consolidation      
Percentage of voting interest required to be held to be accounted for under the equity method 20.00%    
Voting interest required for consolidation 50.00%    
Land, Buildings, Equipment and Software      
Amortization periods 3 years    
Maximum [Member]      
Principles of Consolidation      
Percentage of voting interest required to be held to be accounted for under the equity method 50.00%    
Land, Buildings, Equipment and Software      
Amortization periods 39 years