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Fair Value Measurements Fair Value Measurement (Details) - USD ($) $ in Millions | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Assets [Abstract] |  |  |
Investments |  | $ 9,875 | $ 15,351
Liabilities [Abstract] |  |  |
Securities sold, not yet purchased, at fair value |  | 1,306 | 794
Fair value measurements, Recurring and nonrecurring [Member] |  |  |
Assets [Abstract] |  |  |
Investments |  | 9,582 | 15,028
Derivative contracts, at fair value (asset) | [1] | 19 | 259
Assets, Fair Value Disclosure |  | 9,601 | 15,287
Liabilities [Abstract] |  |  |
Securities sold, not yet purchased, at fair value |  | 1,306 | 794
Other liabilities |  | 21 | 3
Derivative contracts at fair value (liability) | [2] | 448 | 36
Financial and Nonfinancial Liabilities, Fair Value Disclosure |  | 1,775 | 833
Fair value measurements, Recurring and nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Assets [Abstract] |  |  |
Investments |  | 8,956 | 14,447
Derivative contracts, at fair value (asset) | [1] | 0 | 0
Assets, Fair Value Disclosure |  | 8,956 | 14,447
Liabilities [Abstract] |  |  |
Securities sold, not yet purchased, at fair value |  | 1,251 | 794
Other liabilities |  | 0 | 0
Derivative contracts at fair value (liability) | [2] | 0 | 0
Financial and Nonfinancial Liabilities, Fair Value Disclosure |  | 1,251 | 794
Fair value measurements, Recurring and nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Assets [Abstract] |  |  |
Investments |  | 382 | 289
Derivative contracts, at fair value (asset) | [1] | 19 | 259
Assets, Fair Value Disclosure |  | 401 | 548
Liabilities [Abstract] |  |  |
Securities sold, not yet purchased, at fair value |  | 55 | 0
Other liabilities |  | 21 | 3
Derivative contracts at fair value (liability) | [2] | 448 | 36
Financial and Nonfinancial Liabilities, Fair Value Disclosure |  | 524 | 39
Fair value measurements, Recurring and nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Assets [Abstract] |  |  |
Investments |  | 244 | 292
Derivative contracts, at fair value (asset) | [1] | 0 | 0
Assets, Fair Value Disclosure |  | 244 | 292
Liabilities [Abstract] |  |  |
Securities sold, not yet purchased, at fair value |  | 0 | 0
Other liabilities |  | 0 | 0
Derivative contracts at fair value (liability) | [2] | 0 | 0
Financial and Nonfinancial Liabilities, Fair Value Disclosure |  | $ 0 | $ 0
[1] | Amounts are classified within other assets in our condensed consolidated balance sheets.
[2] | Amounts are classified within accrued expenses and other liabilities in our condensed consolidated balance sheets.

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