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Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022 | May 03, 2007
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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 | $ 106 | $ 80 |
Bitcoin [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Fair value of crypto assets held in customers' name | 68 |  |
Ethereum [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Fair value of crypto assets held in customers' name | 36 |  |
Other Crypto-Assets [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Fair value of crypto assets held in customers' name | $ 2 |  |
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 |  |

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- Definition Percentage of unvested shares to be received by employees over the age of 59 who discontinue employment with the Company without cause and continue to meet the terms of the plans' post-employment provisions. + References No definition available. + Details
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