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Significant Accounting Policies (Narrative) (Details) - USD ($)
9 Months Ended
Sep. 30, 2022
Dec. 31, 2021
May 03, 2007
Significant Accounting Policies [Line Items]      
SIP expense - Year of grant     50.00%
SIP expense - Remaining vesting period     50.00%
SIP expense - Employees over 59 in year of grant     100.00%
Percent of shares canceled post employment     50.00%
Over 59 percent of shares eligible     100.00%
Property and equipment useful lives, description Computer equipment is depreciated over three to five years and office furniture and equipment are depreciated over five to seven years. Intangible assets with a finite life are amortized on a straight-line basis over their estimated useful lives of three to five years, and tested for recoverability whenever events indicate that the carrying amounts may not be recoverable. Qualifying costs for internally developed software are capitalized and amortized over the expected useful life of the developed software, not to exceed three years.    
Fair value of crypto assets held in customers' name $ 101,000,000 $ 134,000,000  
Losses identified by third-party cryptocurrency service provider 0    
Bitcoin [Member]      
Significant Accounting Policies [Line Items]      
Fair value of crypto assets held in customers' name 55,000,000    
Ethereum [Member]      
Significant Accounting Policies [Line Items]      
Fair value of crypto assets held in customers' name 44,000,000    
Other Crypto-Assets [Member]      
Significant Accounting Policies [Line Items]      
Fair value of crypto assets held in customers' name $ 2,000,000    
Maximum [Member] | Computer Equipment [Member]      
Significant Accounting Policies [Line Items]      
Property and equipment useful lives 5 years    
Maximum [Member] | Office Furniture And Equipment [Member]      
Significant Accounting Policies [Line Items]      
Property and equipment useful lives 7 years    
Maximum [Member] | Internally Developed Software [Member]      
Significant Accounting Policies [Line Items]      
Intangible assets useful lives 3 years    
Maximum [Member] | Finite-Lived Intangible Assets [Member]      
Significant Accounting Policies [Line Items]      
Intangible assets useful lives 5 years    
Minimum [Member] | Computer Equipment [Member]      
Significant Accounting Policies [Line Items]      
Property and equipment useful lives 3 years    
Minimum [Member] | Office Furniture And Equipment [Member]      
Significant Accounting Policies [Line Items]      
Property and equipment useful lives 5 years    
Minimum [Member] | Finite-Lived Intangible Assets [Member]      
Significant Accounting Policies [Line Items]      
Intangible assets useful lives 3 years