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Fair Value Measurements Fair Value Measurement (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Liabilities [Abstract] |  |  |
Securities sold, not yet purchased, at fair value |  | $ 447 | $ 468
Derivative contracts at fair value (liability) |  | 722 | 36
Recurring measurement |  |  |
Assets [Abstract] |  |  |
Investments |  | 7,922 | 8,182
Derivative contracts, at fair value (asset) | [1] | 27 | 524
Assets, Fair Value Disclosure |  | 7,949 | 8,706
Liabilities [Abstract] |  |  |
Securities sold, not yet purchased, at fair value |  | 447 | 468
Other liabilities |  | 16 | 2
Derivative contracts at fair value (liability) |  | 722 | 36
Financial and Nonfinancial Liabilities, Fair Value Disclosure |  | 1,185 | 506
Recurring measurement | Level 1 |  |  |
Assets [Abstract] |  |  |
Investments |  | 7,598 | 7,493
Derivative contracts, at fair value (asset) | [1] | 0 | 7
Assets, Fair Value Disclosure |  | 7,598 | 7,500
Liabilities [Abstract] |  |  |
Securities sold, not yet purchased, at fair value |  | 447 | 468
Other liabilities |  | 0 | 0
Derivative contracts at fair value (liability) |  | 0 | 0
Financial and Nonfinancial Liabilities, Fair Value Disclosure |  | 447 | 468
Recurring measurement | Level 2 |  |  |
Assets [Abstract] |  |  |
Investments |  | 321 | 317
Derivative contracts, at fair value (asset) | [1] | 27 | 517
Assets, Fair Value Disclosure |  | 348 | 834
Liabilities [Abstract] |  |  |
Securities sold, not yet purchased, at fair value |  | 0 | 0
Other liabilities |  | 16 | 2
Derivative contracts at fair value (liability) |  | 722 | 36
Financial and Nonfinancial Liabilities, Fair Value Disclosure |  | 738 | 38
Recurring measurement | Level 3 |  |  |
Assets [Abstract] |  |  |
Investments |  | 3 | 372
Derivative contracts, at fair value (asset) | [1] | 0 | 0
Assets, Fair Value Disclosure |  | 3 | 372
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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