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Investments (Narrative) (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016 | Jun. 30, 2016
Investments, Debt and Securities [Line Items] |  |  |  |  |
Trading securities |  | $ 203 |  | $ 228 |
Cumulative unrealized gains and losses |  | 0 | $ 0 |  |
Net income from unconsolidated investees |  | $ 4 | $ 2 |  |
Borsa Istanbul Cost Method Investment |  |  |  |  |
Investments, Debt and Securities [Line Items] |  |  |  |  |
Ownership interest, cost method investments |  | 5.00% |  | 5.00% |
Cost method investment, original amount |  | $ 75 |  |  |
LCH |  |  |  |  |
Investments, Debt and Securities [Line Items] |  |  |  |  |
Ownership interest, cost method investments |  | 5.00% |  | 5.00% |
OCC |  |  |  |  |
Investments, Debt and Securities [Line Items] |  |  |  |  |
Committed equity contribution | $ 150 |  |  |  |
Capital contribution | $ 30 |  |  |  |
Annual dividend from shareholders percentage | 50.00% |  |  |  |
OCC | ISE |  |  |  |  |
Investments, Debt and Securities [Line Items] |  |  |  |  |
Ownership interest, equity method investments |  | 40.00% |  |  | 20.00%
Foreign Government Debt Securities |  |  |  |  |
Investments, Debt and Securities [Line Items] |  |  |  |  |
Trading securities |  | $ 154 |  | $ 172 |

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