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Clearing Operations (Schedule of Derivative Contracts Outstanding) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2016 USD ($) contract TW | Dec. 31, 2015 contract TW
Clearing Operations [Line Items] |  |
Market value of derivative contracts | $ | $ 1,607 |
Total Number of Cleared Contracts | contract | 97,302,481 | 105,913,773
Total volume in cleared power, in Terawatt hours (TWh) | TW | 1,658 | 1,496
Commodity and seafood options, futures and forwards |  |
Clearing Operations [Line Items] |  |
Market value of derivative contracts | $ | $ 613 |
Total Number of Cleared Contracts | contract | 3,530,746 | 3,055,073
Fixed-income options and futures |  |
Clearing Operations [Line Items] |  |
Market value of derivative contracts | $ | $ 727 |
Total Number of Cleared Contracts | contract | 14,639,065 | 19,631,917
Stock options and futures |  |
Clearing Operations [Line Items] |  |
Market value of derivative contracts | $ | $ 151 |
Total Number of Cleared Contracts | contract | 28,496,143 | 33,455,560
Index options and futures |  |
Clearing Operations [Line Items] |  |
Market value of derivative contracts | $ | $ 116 |
Total Number of Cleared Contracts | contract | 50,636,527 | 49,771,223

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- Definition The number of derivative instruments of a particular group held by the entity. + References 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 + Details
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