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Fair Value Measurements Fair Value Measurement (Details) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017
Liabilities [Abstract]
Securities sold, not yet purchased, at fair value		$ 299	$ 1,023
Derivative contracts at fair value (liability)		972	1,275
Recurring measurement
Assets [Abstract]
Investments		7,929	9,921
Derivative contracts, at fair value (asset)	[1]	25	1
Assets, Fair Value Disclosure		7,954	9,922
Liabilities [Abstract]
Securities sold, not yet purchased, at fair value		299	1,023
Other liabilities		19	1
Derivative contracts at fair value (liability)		972	1,275
Financial and Nonfinancial Liabilities, Fair Value Disclosure		1,290	2,299
Recurring measurement | Level 1
Assets [Abstract]
Investments		7,361	9,378
Derivative contracts, at fair value (asset)	[1]	22	0
Assets, Fair Value Disclosure		7,383	9,378
Liabilities [Abstract]
Securities sold, not yet purchased, at fair value		281	988
Other liabilities		0	0
Derivative contracts at fair value (liability)		0	36
Financial and Nonfinancial Liabilities, Fair Value Disclosure		281	1,024
Recurring measurement | Level 2
Assets [Abstract]
Investments		266	264
Derivative contracts, at fair value (asset)	[1]	3	1
Assets, Fair Value Disclosure		269	265
Liabilities [Abstract]
Securities sold, not yet purchased, at fair value		18	35
Other liabilities		19	1
Derivative contracts at fair value (liability)		972	1,239
Financial and Nonfinancial Liabilities, Fair Value Disclosure		1,009	1,275
Recurring measurement | Level 3
Assets [Abstract]
Investments		302	279
Derivative contracts, at fair value (asset)	[1]	0	0
Assets, Fair Value Disclosure		302	279
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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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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