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Fair Value Measurements Fair Value Measurement (Details) - USD ($) $ in Millions | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Assets [Abstract] |  |  |
Investments |  | $ 9,987 | $ 15,351
Derivative contracts, at fair value (asset) | [1] | 20 | 259
Assets, Fair Value Disclosure |  | 9,705 | 15,287
Liabilities [Abstract] |  |  |
Securities sold, not yet purchased, at fair value |  | 1,210 | 794
Other liabilities |  | 112 | 3
Derivative contracts at fair value (liability) | [2] | 768 | 36
Financial and Nonfinancial Liabilities, Fair Value Disclosure |  | 2,090 | 833
Fair Value, Inputs, Level 1 [Member] |  |  |
Assets [Abstract] |  |  |
Assets, Fair Value Disclosure |  | 9,037 | 14,447
Liabilities [Abstract] |  |  |
Securities sold, not yet purchased, at fair value |  | 1,154 | 794
Financial and Nonfinancial Liabilities, Fair Value Disclosure |  | 1,154 | 794
Fair Value, Inputs, Level 2 [Member] |  |  |
Assets [Abstract] |  |  |
Assets, Fair Value Disclosure |  | 425 | 548
Liabilities [Abstract] |  |  |
Securities sold, not yet purchased, at fair value |  | 56 | 0
Financial and Nonfinancial Liabilities, Fair Value Disclosure |  | 936 | 39
Fair Value, Inputs, Level 3 [Member] |  |  |
Assets [Abstract] |  |  |
Assets, Fair Value Disclosure |  | 243 | 292
Liabilities [Abstract] |  |  |
Securities sold, not yet purchased, at fair value |  | 0 | 0
Financial and Nonfinancial Liabilities, Fair Value Disclosure |  | 0 | 0
Other Segments and Holding Company [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Assets [Abstract] |  |  |
Derivative contracts, at fair value (asset) | [1] | 0 | 0
Liabilities [Abstract] |  |  |
Other liabilities |  | 0 | 0
Derivative contracts at fair value (liability) | [2] | 0 | 0
Other Segments and Holding Company [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Assets [Abstract] |  |  |
Derivative contracts, at fair value (asset) | [1] | 20 | 259
Liabilities [Abstract] |  |  |
Other liabilities |  | 112 | 3
Derivative contracts at fair value (liability) | [2] | 768 | 36
Other Segments and Holding Company [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Assets [Abstract] |  |  |
Derivative contracts, at fair value (asset) | [1] | 0 | 0
Liabilities [Abstract] |  |  |
Other liabilities |  | 0 | 0
Derivative contracts at fair value (liability) | [2] | 0 | 0
Other investments |  |  |
Assets [Abstract] |  |  |
Investments |  | 9,685 | 15,028
Other investments | Other Segments and Holding Company [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Assets [Abstract] |  |  |
Investments |  | 9,037 | 14,447
Other investments | Other Segments and Holding Company [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Assets [Abstract] |  |  |
Investments |  | 405 | 289
Other investments | Other Segments and Holding Company [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Assets [Abstract] |  |  |
Investments |  | $ 243 | $ 292
[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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