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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Principles of Consolidation      
Maximum percentage of voting interest required to be held to be accounted for, under the cost method 20.00%    
Land, Buildings, Equipment and Software      
Land, buildings, equipment and software, net of accumulated depreciation $ 602 $ 610  
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment 1,900 1,800  
Depreciation and amortization expense for the year $ 153 $ 147 $ 146
Minimum [Member]      
Principles of Consolidation      
Voting interest required for consolidation 50.00%    
Percentage of voting interest required to be held to be accounted for under the equity method 20.00%    
Land, Buildings, Equipment and Software      
Amortization periods 3 years    
Lease renewal term 1 year    
Property, Plant and Equipment [Line Items]      
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    
Lease renewal term 20 years    
Property, Plant and Equipment [Line Items]      
Amortization periods 39 years