Clearing Operations (Schedule of Clearing Member Default Fund Contributions And Margin Deposits) (Details) - USD ($) $ in Millions |
Sep. 30, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Clearing Operations [Line Items] | ||
| Default fund contributions | $ 1,453 | |
| Margin deposits | 10,507 | |
| Total | 11,960 | |
| Cash Contributions | ||
| Clearing Operations [Line Items] | ||
| Default fund contributions | 1,275 | |
| Margin deposits | 4,475 | |
| Total | 5,750 | $ 5,664 |
| Non-Cash Contributions | ||
| Clearing Operations [Line Items] | ||
| Default fund contributions | 178 | |
| Margin deposits | 6,032 | |
| Total | $ 6,210 |