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Fair Value Measurements Fair Value Measurement (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Liabilities [Abstract] |  |  |
Securities sold, not yet purchased, at fair value |  | $ 368 | $ 1,023
Derivative contracts at fair value (liability) |  | 460 | 1,275
Recurring measurement |  |  |
Assets [Abstract] |  |  |
Investments |  | 8,580 | 9,920
Derivative contracts, at fair value (asset) | [1] | 27 | 0
Assets, Fair Value Disclosure |  | 8,607 | 9,920
Liabilities [Abstract] |  |  |
Securities sold, not yet purchased, at fair value |  | 368 | 1,023
Other liabilities |  | 11 | 1
Derivative contracts at fair value (liability) |  | 460 | 1,275
Financial and Nonfinancial Liabilities, Fair Value Disclosure |  | 839 | 2,299
Recurring measurement | Level 1 |  |  |
Assets [Abstract] |  |  |
Investments |  | 7,972 | 9,378
Derivative contracts, at fair value (asset) | [1] | 10 | 0
Assets, Fair Value Disclosure |  | 7,982 | 9,378
Liabilities [Abstract] |  |  |
Securities sold, not yet purchased, at fair value |  | 368 | 988
Other liabilities |  | 0 | 0
Derivative contracts at fair value (liability) |  | 0 | 36
Financial and Nonfinancial Liabilities, Fair Value Disclosure |  | 368 | 1,024
Recurring measurement | Level 2 |  |  |
Assets [Abstract] |  |  |
Investments |  | 275 | 264
Derivative contracts, at fair value (asset) | [1] | 17 | 0
Assets, Fair Value Disclosure |  | 292 | 264
Liabilities [Abstract] |  |  |
Securities sold, not yet purchased, at fair value |  | 0 | 35
Other liabilities |  | 11 | 1
Derivative contracts at fair value (liability) |  | 460 | 1,239
Financial and Nonfinancial Liabilities, Fair Value Disclosure |  | 471 | 1,275
Recurring measurement | Level 3 |  |  |
Assets [Abstract] |  |  |
Investments |  | 333 | 278
Derivative contracts, at fair value (asset) | [1] | 0 | 0
Assets, Fair Value Disclosure |  | 333 | 278
Liabilities [Abstract] |  |  |
Securities sold, not yet purchased, at fair value |  | 0 | 0
Other liabilities |  | 0 | 0
Derivative contracts at fair value (liability) |  | 0 | 0
Financial and Nonfinancial Liabilities, Fair Value Disclosure |  | $ 0 | $ 0
[1] | Amounts are classified within other assets in our condensed consolidated balance sheets.

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