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Financial Assets And Financial Liabilities (Financial Assets and Liabilities Not Measured at Fair Value) (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Cash and cash equivalents $ 2,500 $ 1,732 $ 2,115
Cash - segregated for regulatory purposes 7,686 6,547 $ 6,910
Securities - segregated for regulatory purposes 13,368 13,685  
Securities borrowed 3,588 2,957  
Securities purchased under agreements to resell 533 2,035  
Receivables from customer 28,970 29,821  
Receivables from brokers, dealers and clearing organizations 1,134 823  
Interest receivable 117 116  
Other assets 319 292  
Short-term borrowings 193 15  
Securities loaned 4,091 4,444  
Securities sold under agreements to repurchase 1,316  
Payables to customers 48,239 47,548  
Payables to brokers, dealers and clearing organizations 100 283  
Interest payable 29 22  
at Fair Value      
Cash and cash equivalents 2,500 1,732  
Cash - segregated for regulatory purposes 7,686 6,547  
Securities - segregated for regulatory purposes 8,998 9,166  
Securities borrowed 3,588 2,957  
Securities purchased under agreements to resell 533 2,035  
Receivables from customer 28,970 29,821  
Receivables from brokers, dealers and clearing organizations 1,134 823  
Interest receivable 117 116  
Other assets 6 6  
Total financial assets, not measured at fair value 53,532 53,203  
Short-term borrowings 193 15  
Securities loaned 4,091 4,444  
Securities sold under agreements to repurchase   1,316  
Payables to customers 48,239 47,548  
Payables to brokers, dealers and clearing organizations 100 283  
Interest payable 29 22  
Total financial liabilities, not measured at fair value 52,652 53,628  
Carrying Value      
Cash and cash equivalents 2,500 1,732  
Cash - segregated for regulatory purposes 7,686 6,547  
Securities - segregated for regulatory purposes 8,998 9,166  
Securities borrowed 3,588 2,957  
Securities purchased under agreements to resell 533 2,035  
Receivables from customer 28,970 29,821  
Receivables from brokers, dealers and clearing organizations 1,134 823  
Interest receivable 117 116  
Other assets 5 6  
Total financial assets, not measured at fair value 53,531 53,203  
Short-term borrowings 193 15  
Securities loaned 4,091 4,444  
Securities sold under agreements to repurchase   1,316  
Payables to customers 48,239 47,548  
Payables to brokers, dealers and clearing organizations 100 283  
Interest payable 29 22  
Total financial liabilities, not measured at fair value 52,652 53,628  
Level 1      
Cash and cash equivalents 2,500 1,732  
Cash - segregated for regulatory purposes 7,686 6,547  
Total financial assets, not measured at fair value 10,186 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 8,998 9,166  
Securities borrowed 3,588 2,957  
Securities purchased under agreements to resell 533 2,035  
Receivables from customer 28,970 29,821  
Receivables from brokers, dealers and clearing organizations 1,134 823  
Interest receivable 117 116  
Other assets 6 6  
Total financial assets, not measured at fair value 43,346 44,924  
Short-term borrowings 193 15  
Securities loaned 4,091 4,444  
Securities sold under agreements to repurchase   1,316  
Payables to customers 48,239 47,548  
Payables to brokers, dealers and clearing organizations 100 283  
Interest payable 29 22  
Total financial liabilities, not measured at fair value 52,652 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