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Financial Assets And Financial Liabilities (Financial Assets and Liabilities Not Measured at Fair Value) (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Cash and cash equivalents $ 3,062 $ 1,732 $ 2,056
Cash - segregated for regulatory purposes 7,523 6,547 $ 7,546
Securities - segregated for regulatory purposes 12,832 13,685  
Securities borrowed 3,551 2,957  
Securities purchased under agreements to resell 331 2,035  
Receivables from customer 30,913 29,821  
Receivables from brokers, dealers and clearing organizations 846 823  
Interest receivable 117 116  
Other assets 299 292  
Short-term borrowings 28 15  
Securities loaned 3,834 4,444  
Securities sold under agreements to repurchase 1,316  
Payables to customers 49,823 47,548  
Payables to brokers, dealers and clearing organizations 179 283  
Interest payable 35 22  
at Fair Value      
Cash and cash equivalents 3,062 1,732  
Cash - segregated for regulatory purposes 7,523 6,547  
Securities - segregated for regulatory purposes 8,734 9,166  
Securities borrowed 3,551 2,957  
Securities purchased under agreements to resell 331 2,035  
Receivables from customer 30,913 29,821  
Receivables from brokers, dealers and clearing organizations 846 823  
Interest receivable 117 116  
Other assets 6 6  
Total financial assets, not measured at fair value 55,083 53,203  
Short-term borrowings 28 15  
Securities loaned 3,834 4,444  
Securities sold under agreements to repurchase   1,316  
Payables to customers 49,823 47,548  
Payables to brokers, dealers and clearing organizations 179 283  
Interest payable 35 22  
Total financial liabilities, not measured at fair value 53,899 53,628  
Carrying Value      
Cash and cash equivalents 3,062 1,732  
Cash - segregated for regulatory purposes 7,523 6,547  
Securities - segregated for regulatory purposes 8,734 9,166  
Securities borrowed 3,551 2,957  
Securities purchased under agreements to resell 331 2,035  
Receivables from customer 30,913 29,821  
Receivables from brokers, dealers and clearing organizations 846 823  
Interest receivable 117 116  
Other assets 5 6  
Total financial assets, not measured at fair value 55,082 53,203  
Short-term borrowings 28 15  
Securities loaned 3,834 4,444  
Securities sold under agreements to repurchase   1,316  
Payables to customers 49,823 47,548  
Payables to brokers, dealers and clearing organizations 179 283  
Interest payable 35 22  
Total financial liabilities, not measured at fair value 53,899 53,628  
Level 1      
Cash and cash equivalents 3,062 1,732  
Cash - segregated for regulatory purposes 7,523 6,547  
Total financial assets, not measured at fair value 10,585 8,279  
Short-term borrowings  
Securities loaned  
Securities sold under agreements to repurchase  
Payables to customers  
Payables to brokers, dealers and clearing organizations  
Interest payable  
Total financial liabilities, not measured at fair value  
Level 2      
Securities - segregated for regulatory purposes 8,734 9,166  
Securities borrowed 3,551 2,957  
Securities purchased under agreements to resell 331 2,035  
Receivables from customer 30,913 29,821  
Receivables from brokers, dealers and clearing organizations 846 823  
Interest receivable 117 116  
Other assets 6 6  
Total financial assets, not measured at fair value 44,498 44,924  
Short-term borrowings 28 15  
Securities loaned 3,834 4,444  
Securities sold under agreements to repurchase   1,316  
Payables to customers 49,823 47,548  
Payables to brokers, dealers and clearing organizations 179 283  
Interest payable 35 22  
Total financial liabilities, not measured at fair value 53,899 53,628  
Level 3      
Cash and cash equivalents  
Cash - segregated for regulatory purposes  
Securities - segregated for regulatory purposes  
Securities borrowed  
Securities purchased under agreements to resell  
Receivables from customer  
Receivables from brokers, dealers and clearing organizations  
Interest receivable  
Other assets  
Total financial assets, not measured at fair value  
Short-term borrowings  
Securities loaned  
Securities sold under agreements to repurchase  
Payables to customers  
Payables to brokers, dealers and clearing organizations  
Interest payable  
Total financial liabilities, not measured at fair value