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Fair Value Measurements Fair Value Measurement (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Liabilities [Abstract] |  |  |
Securities sold, not yet purchased, at fair value |  | $ 1,258 | $ 1,139
Recurring measurement |  |  |
Assets [Abstract] |  |  |
Investments |  | 9,396 | 9,551
Derivative contracts, at fair value (asset) | [1] | 10 | 23
Assets, Fair Value Disclosure |  | 9,406 | 9,574
Liabilities [Abstract] |  |  |
Securities sold, not yet purchased, at fair value |  | 1,258 | 1,139
Other liabilities |  | 127 | 187
Derivative contracts at fair value (liability) | [2] | 1,683 | 1,139
Financial and Nonfinancial Liabilities, Fair Value Disclosure |  | 3,068 | 2,465
Recurring measurement | Level 1 |  |  |
Assets [Abstract] |  |  |
Investments |  | 8,544 | 9,033
Derivative contracts, at fair value (asset) | [1] | 9 | 0
Assets, Fair Value Disclosure |  | 8,553 | 9,033
Liabilities [Abstract] |  |  |
Securities sold, not yet purchased, at fair value |  | 1,213 | 1,087
Other liabilities |  | 0 | 0
Derivative contracts at fair value (liability) | [2] | 0 | 0
Financial and Nonfinancial Liabilities, Fair Value Disclosure |  | 1,213 | 1,087
Recurring measurement | Level 2 |  |  |
Assets [Abstract] |  |  |
Investments |  | 587 | 306
Derivative contracts, at fair value (asset) | [1] | 1 | 23
Assets, Fair Value Disclosure |  | 588 | 329
Liabilities [Abstract] |  |  |
Securities sold, not yet purchased, at fair value |  | 45 | 52
Other liabilities |  | 127 | 187
Derivative contracts at fair value (liability) | [2] | 1,683 | 1,139
Financial and Nonfinancial Liabilities, Fair Value Disclosure |  | 1,855 | 1,378
Recurring measurement | Level 3 |  |  |
Assets [Abstract] |  |  |
Investments |  | 265 | 212
Derivative contracts, at fair value (asset) | [1] | 0 | 0
Assets, Fair Value Disclosure |  | 265 | 212
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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