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Interest Income and Interest Expense (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Interest income:      
Cash and equivalents $ 9 $ 7 $ 3
Cash required to be segregated under federal or other regulations 12 6 1
Available-for-sale securities 390 266 244
Held-to-maturity securities 572 425 346
Margin receivables 320 249 276
Loans 157 191 230
Broker-related receivables and other 3 1 3
Subtotal interest income 1,463 1,145 1,103
Other interest revenue(1) 108 88 112
Total interest income(2) 1,571 1,233 1,215
Interest expense:      
Deposits (4) (3) (4)
Customer payables (5) (5) (5)
Other borrowings (22) (18) (117)
Corporate debt (48) (54) (59)
Subtotal interest expense (79) (80) (185)
Other interest expense(3) (7) (5) (9)
Total interest expense(4) (86) (85) (194)
Net interest income 1,485 1,148 1,021
Hedging expense included in interest income $ (59) $ (35) (42)
Hedging income included in interest expense     $ (74)