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Fair Value Measurements Fair Value Measurement (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Liabilities [Abstract]    
Securities sold, not yet purchased, at fair value $ 223 $ 468
Derivative contracts at fair value (liability) 461 36
Recurring measurement    
Assets [Abstract]    
Investments 9,226 8,182
Derivative contracts, at fair value (asset) [1] 149 524
Assets, Fair Value Disclosure 9,375 8,706
Liabilities [Abstract]    
Securities sold, not yet purchased, at fair value 223 468
Other liabilities 9 2
Derivative contracts at fair value (liability) 461 36
Financial and Nonfinancial Liabilities, Fair Value Disclosure 693 506
Recurring measurement | Level 1    
Assets [Abstract]    
Investments 8,918 7,493
Derivative contracts, at fair value (asset) [1] 0 7
Assets, Fair Value Disclosure 8,918 7,500
Liabilities [Abstract]    
Securities sold, not yet purchased, at fair value 223 468
Other liabilities 0 0
Derivative contracts at fair value (liability) 0 0
Financial and Nonfinancial Liabilities, Fair Value Disclosure 223 468
Recurring measurement | Level 2    
Assets [Abstract]    
Investments 305 317
Derivative contracts, at fair value (asset) [1] 149 517
Assets, Fair Value Disclosure 454 834
Liabilities [Abstract]    
Securities sold, not yet purchased, at fair value 0 0
Other liabilities 9 2
Derivative contracts at fair value (liability) 461 36
Financial and Nonfinancial Liabilities, Fair Value Disclosure 470 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.