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Significant Accounting Policies (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Dec. 31, 2020
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.  
AOCI gain (loss) reclassified to earnings $ (34)    
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