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Clearing Operations (Schedule of Clearing Member Default Fund Contributions And Margin Deposits) (Details) $ in Millions	Mar. 31, 2017 USD ($)
Clearing Operations [Line Items]
Default fund contributions	$ 433
Margin deposits	6,945
Total	7,378
Cash Contributions
Clearing Operations [Line Items]
Default fund contributions	334
Margin deposits	3,299
Total	3,633
Non-Cash Contributions
Clearing Operations [Line Items]
Default fund contributions	99
Margin deposits	3,646
Total	$ 3,745

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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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