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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
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    
Land, Buildings, Equipment and Software      
Land, buildings, equipment and software, net of accumulated depreciation $ 626 $ 607  
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment 1,900 1,800  
Depreciation and amortization expense for the year $ 141 $ 149 $ 150
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