Clearing Operations (Schedule of Clearing Member Default Fund Contributions And Margin Deposits) (Details) - USD ($) $ in Millions |
Jun. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Clearing Operations [Line Items] | ||
| Default fund contributions | $ 428 | |
| Margin deposits | 7,457 | |
| Total | 7,885 | |
| Cash Contributions | ||
| Clearing Operations [Line Items] | ||
| Default fund contributions | 329 | |
| Margin deposits | 1,994 | |
| Total | 2,323 | $ 5,842 |
| Non-Cash Contributions | ||
| Clearing Operations [Line Items] | ||
| Default fund contributions | 99 | |
| Margin deposits | 5,463 | |
| Total | $ 5,562 |