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Investments (Narrative) (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Jun. 30, 2016
Investments, Debt and Securities [Line Items] |  |  |  |  |
Unrealized gain (loss) on securities |  | $ 0 | $ 0 |  |
Trading securities |  | 228 | 189 |  |
Net income from unconsolidated investees |  | $ 2 | $ 17 | $ 0 |
Borsa Istanbul Cost Method Investment |  |  |  |  |
Investments, Debt and Securities [Line Items] |  |  |  |  |
Ownership interest |  | 5.00% | 5.00% |  |
Cost method investment, original amount |  | $ 75 |  |  |
LCH |  |  |  |  |
Investments, Debt and Securities [Line Items] |  |  |  |  |
Ownership interest |  | 5.00% | 5.00% |  |
OCC |  |  |  |  |
Investments, Debt and Securities [Line Items] |  |  |  |  |
Net income from unconsolidated investees | $ 13 |  |  |  |
Committed equity contribution |  |  | $ 150 |  |
Capital contribution |  |  | $ 30 |  |
Annual dividend from shareholders percentage |  |  | 50.00% |  |
OCC | ISE |  |  |  |  |
Investments, Debt and Securities [Line Items] |  |  |  |  |
Ownership interest |  | 40.00% |  |  | 20.00%
TOM |  |  |  |  |
Investments, Debt and Securities [Line Items] |  |  |  |  |
Non-cash impairment charge |  | $ 7 |  |  |
Foreign Government Debt Securities |  |  |  |  |
Investments, Debt and Securities [Line Items] |  |  |  |  |
Trading securities |  | $ 172 | $ 166 |  |

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- Definition Amount of unrealized gain (loss) on investments in debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563 + Details
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- Definition This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 35 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=64825282&loc=d3e32787-111569 + Details
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