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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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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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-Publisher FASB
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