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Fair Value Measurements Fair Value Measurement (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Liabilities [Abstract]    
Securities sold, not yet purchased, at fair value $ 146 $ 468
Derivative contracts at fair value (liability) 902 36
Recurring measurement    
Assets [Abstract]    
Investments 8,657 8,182
Derivative contracts, at fair value (asset) [1] 215 524
Assets, Fair Value Disclosure 8,872 8,706
Liabilities [Abstract]    
Securities sold, not yet purchased, at fair value 146 468
Other liabilities 16 2
Derivative contracts at fair value (liability) 902 36
Financial and Nonfinancial Liabilities, Fair Value Disclosure 1,064 506
Recurring measurement | Level 1    
Assets [Abstract]    
Investments 8,327 7,493
Derivative contracts, at fair value (asset) [1] 6 7
Assets, Fair Value Disclosure 8,333 7,500
Liabilities [Abstract]    
Securities sold, not yet purchased, at fair value 146 468
Other liabilities 0 0
Derivative contracts at fair value (liability) 0 0
Financial and Nonfinancial Liabilities, Fair Value Disclosure 146 468
Recurring measurement | Level 2    
Assets [Abstract]    
Investments 327 317
Derivative contracts, at fair value (asset) [1] 209 517
Assets, Fair Value Disclosure 536 834
Liabilities [Abstract]    
Securities sold, not yet purchased, at fair value 0 0
Other liabilities 16 2
Derivative contracts at fair value (liability) 902 36
Financial and Nonfinancial Liabilities, Fair Value Disclosure 918 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.