XML 49 R38.htm IDEA: XBRL DOCUMENT v3.24.2.u1
Significant Accounting Policies (Narrative) (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
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%
Fair value of crypto assets held in customers' name $ 250 $ 172  
Bitcoin [Member]      
Significant Accounting Policies [Line Items]      
Fair value of crypto assets held in customers' name 176    
Ethereum [Member]      
Significant Accounting Policies [Line Items]      
Fair value of crypto assets held in customers' name 72    
Other Crypto-Assets [Member]      
Significant Accounting Policies [Line Items]      
Fair value of crypto assets held in customers' name $ 2    
Maximum [Member]      
Significant Accounting Policies [Line Items]      
Leases, remaining terms 13 years    
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]      
Significant Accounting Policies [Line Items]      
Leases, remaining terms 1 year    
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