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Fair Value Measurements Fair Value Measurement (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Liabilities [Abstract]    
Securities sold, not yet purchased, at fair value $ 2,192 $ 1,139
Recurring measurement    
Assets [Abstract]    
Investments 9,766 9,551
Derivative contracts, at fair value (asset) 8 23
Assets, Fair Value Disclosure 9,774 9,574
Liabilities [Abstract]    
Securities sold, not yet purchased, at fair value 2,192 1,139
Other liabilities 180 187
Derivative contracts at fair value (liability) 1,673 1,139
Financial and Nonfinancial Liabilities, Fair Value Disclosure 4,045 2,465
Recurring measurement | Level 1    
Assets [Abstract]    
Investments 9,163 9,033
Derivative contracts, at fair value (asset) [1] 0 0
Assets, Fair Value Disclosure 9,163 9,033
Liabilities [Abstract]    
Securities sold, not yet purchased, at fair value 2,139 1,087
Other liabilities 0 0
Derivative contracts at fair value (liability) [2] 0 0
Financial and Nonfinancial Liabilities, Fair Value Disclosure 2,139 1,087
Recurring measurement | Level 2    
Assets [Abstract]    
Investments 389 306
Derivative contracts, at fair value (asset) [1] 8 23
Assets, Fair Value Disclosure 397 329
Liabilities [Abstract]    
Securities sold, not yet purchased, at fair value 53 52
Other liabilities 180 187
Derivative contracts at fair value (liability) [2] 1,673 1,139
Financial and Nonfinancial Liabilities, Fair Value Disclosure 1,906 1,378
Recurring measurement | Level 3    
Assets [Abstract]    
Investments 214 212
Derivative contracts, at fair value (asset) [1] 0 0
Assets, Fair Value Disclosure 214 212
Liabilities [Abstract]    
Securities sold, not yet purchased, at fair value 0 0
Other liabilities 0 0
Derivative contracts at fair value (liability) [2] 0 0
Financial and Nonfinancial Liabilities, Fair Value Disclosure $ 0 $ 0
[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.