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Clearing Operations (Schedule of Clearing Member Default Fund Contributions And Margin Deposits) (Details) $ in Millions	Sep. 30, 2018 USD ($)
Clearing Operations [Line Items]
Default fund contributions	$ 515
Margin deposits	7,734
Total	8,249
Cash Contributions
Clearing Operations [Line Items]
Default fund contributions	407
Margin deposits	3,812
Total	4,219
Non-Cash Contributions
Clearing Operations [Line Items]
Default fund contributions	108
Margin deposits	3,922
Total	$ 4,030

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- Definition

Clearing Operations [Line Items]

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Default fund Contributions.

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Default fund contributions and margin deposits

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Margin deposits

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