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Clearing Operations (Schedule of Derivative Contracts Outstanding) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2017 USD ($) contract TW	Mar. 31, 2016 contract TW
Clearing Operations [Line Items]
Market value of derivative contracts | $	$ 1,526
Total Number of Cleared Contracts | contract	24,583,690	28,266,359
Total volume in cleared power, in Terawatt hours (TWh) | TW	379	420
Commodity and seafood options, futures and forwards
Clearing Operations [Line Items]
Market value of derivative contracts | $	$ 550
Total Number of Cleared Contracts | contract	726,739	907,921
Fixed-income options and futures
Clearing Operations [Line Items]
Market value of derivative contracts | $	$ 743
Total Number of Cleared Contracts | contract	5,158,237	4,368,986
Stock options and futures
Clearing Operations [Line Items]
Market value of derivative contracts | $	$ 132
Total Number of Cleared Contracts | contract	7,383,538	8,303,721
Index options and futures
Clearing Operations [Line Items]
Market value of derivative contracts | $	$ 101
Total Number of Cleared Contracts | contract	11,315,176	14,685,731

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Clearing Operations [Line Items]

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Derivative contracts market value

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Total volume in cleared power.

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The number of derivative instruments of a particular group held by the entity.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5579245-113959

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