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Fair Value Measurements Fair Value Measurement (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Liabilities [Abstract]    
Securities sold, not yet purchased, at fair value $ 1,190 $ 468
Derivative contracts, at fair value (Note 6) 1,224 36
Recurring measurement    
Assets [Abstract]    
Investments 9,732 8,182
Derivative contracts, at fair value(1) 182 524
Assets, Fair Value Disclosure 9,914 8,706
Liabilities [Abstract]    
Securities sold, not yet purchased, at fair value 1,190 468
Other liabilities 13 2
Derivative contracts, at fair value (Note 6) 1,224 36
Financial and Nonfinancial Liabilities, Fair Value Disclosure 2,427 506
Recurring measurement | Level 3    
Assets [Abstract]    
Investments 3 372
Derivative contracts, at fair value(1) 0 0
Assets, Fair Value Disclosure 3 372
Liabilities [Abstract]    
Securities sold, not yet purchased, at fair value 0 0
Other liabilities 6 0
Derivative contracts, at fair value (Note 6) 0 0
Financial and Nonfinancial Liabilities, Fair Value Disclosure 6 0
Recurring measurement | Level 1    
Assets [Abstract]    
Investments 9,448 7,493
Derivative contracts, at fair value(1) 0 7
Assets, Fair Value Disclosure 9,448 7,500
Liabilities [Abstract]    
Securities sold, not yet purchased, at fair value 1,190 468
Other liabilities 0 0
Derivative contracts, at fair value (Note 6) 0 0
Financial and Nonfinancial Liabilities, Fair Value Disclosure 1,190 468
Recurring measurement | Level 2    
Assets [Abstract]    
Investments 281 317
Derivative contracts, at fair value(1) 182 517
Assets, Fair Value Disclosure 463 834
Liabilities [Abstract]    
Securities sold, not yet purchased, at fair value 0 0
Other liabilities 7 2
Derivative contracts, at fair value (Note 6) 1,224 36
Financial and Nonfinancial Liabilities, Fair Value Disclosure $ 1,231 $ 38