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Summary of Significant Accounting Policies Property, Plant and Equipment (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Building    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 30 years  
Leasehold Improvements | Maximum    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 20 years  
Furniture and Fixtures | Minimum    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 3 years  
Furniture and Fixtures | Maximum    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 7 years  
Software    
Property, Plant and Equipment [Line Items]    
Capitalized Computer Software, Net $ 126 $ 118
Software | Minimum    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 1 year  
Software | Maximum    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 5 years