Clearing Operations (Schedule of Clearing Member Default Fund Contributions And Margin Deposits) (Details) - USD ($) $ in Millions |
Sep. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Clearing Operations [Line Items] | ||
| Default fund contributions | $ 417 | |
| Margin deposits | 7,903 | |
| Total | 8,320 | |
| Cash Contributions | ||
| Clearing Operations [Line Items] | ||
| Default fund contributions | 319 | |
| Margin deposits | 2,211 | |
| Total | 2,530 | $ 5,842 |
| Non-Cash Contributions | ||
| Clearing Operations [Line Items] | ||
| Default fund contributions | 98 | |
| Margin deposits | 5,692 | |
| Total | $ 5,790 |