Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Schedule Of Property, Software And Equipment Depreciation Periods (Details)

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Summary of Significant Accounting Policies - Schedule Of Property, Software And Equipment Depreciation Periods (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Property, Plant and Equipment [Line Items]  
Restricted cash and cash equivalents $ 8
Buildings and land improvements | Minimum  
Property, Plant and Equipment [Line Items]  
Fixed Asset - depreciation period 5 years
Buildings and land improvements | Maximum  
Property, Plant and Equipment [Line Items]  
Fixed Asset - depreciation period 40 years
Computer hardware and software | Minimum  
Property, Plant and Equipment [Line Items]  
Fixed Asset - depreciation period 2 years
Computer hardware and software | Maximum  
Property, Plant and Equipment [Line Items]  
Fixed Asset - depreciation period 7 years
Furniture and equipment | Minimum  
Property, Plant and Equipment [Line Items]  
Fixed Asset - depreciation period 3 years
Furniture and equipment | Maximum  
Property, Plant and Equipment [Line Items]  
Fixed Asset - depreciation period 10 years
Land improvements | Minimum  
Property, Plant and Equipment [Line Items]  
Fixed Asset - depreciation period 3 years
Land improvements | Maximum  
Property, Plant and Equipment [Line Items]  
Fixed Asset - depreciation period 20 years
Leasehold improvements | Minimum  
Property, Plant and Equipment [Line Items]  
Fixed Asset - depreciation period 1 year
Leasehold improvements | Maximum  
Property, Plant and Equipment [Line Items]  
Fixed Asset - depreciation period 20 years