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Commitments and Contingencies - Narrative (Details)
$ in Millions
9 Months Ended
Sep. 30, 2019
USD ($)
ft²
Jan. 01, 2019
USD ($)
Apr. 10, 2015
USD ($)
Transaction
Mar. 15, 2013
Transaction
Nov. 28, 2011
USD ($)
Transaction
Commitments and Contingencies Legal Proceedings          
Lease, number of square feet | ft² 103,500        
Lessee, operating lease, renewal term 5 years        
Leases excluded from recognition of Topic 842, initial lease term (or less) 12 months        
Weighted average remaining lease term (years)-operating leases 12 years        
Weighted average discount rate-operating leases 3.00%        
Total operating lease liabilities $ 90 $ 95      
Right-of-use asset $ 65 69      
Deferred rent and lease incentive liabilities   $ 26      
LBIE vs. AG Financial Products [Member] | AG Financial Products Inc. [Member] | Guarantee Obligations [Member]          
Commitments and Contingencies Legal Proceedings          
Number of credit derivative transactions for which termination payment is alleged to be improperly calculated | Transaction       9 9
LBIE vs. AG Financial Products [Member] | Lehman Brothers International (Europe) [Member]          
Commitments and Contingencies Legal Proceedings          
Gain contingency, number of credit derivative transactions with improperly calculated payments | Transaction     28    
Positive Outcome of Litigation [Member] | Pending Litigation [Member] | LBIE vs. AG Financial Products [Member] | AG Financial Products Inc. [Member]          
Commitments and Contingencies Legal Proceedings          
Termination payments which LBIE owes to AG Financial Products as per calculation of AG Financial Products         $ 4
Other credit derivative transactions which LBIE owes to AG Financial Products as per calculation of AG financial products         25
Positive Outcome of Litigation [Member] | Pending Litigation [Member] | LBIE vs. AG Financial Products [Member] | Lehman Brothers International (Europe) [Member]          
Commitments and Contingencies Legal Proceedings          
Termination payments which AG Financial Products owes to LBIE as per calculation of LBIE         $ 1,400
Minimum [Member] | Positive Outcome of Litigation [Member] | LBIE vs. AG Financial Products [Member] | Lehman Brothers International (Europe) [Member]          
Commitments and Contingencies Legal Proceedings          
Gain contingency, unrecorded amount     $ 200    
Maximum [Member] | Positive Outcome of Litigation [Member] | LBIE vs. AG Financial Products [Member] | Lehman Brothers International (Europe) [Member]          
Commitments and Contingencies Legal Proceedings          
Gain contingency, unrecorded amount     $ 500