Net Revenue (Details - Interest Income and Interest Expense) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Interest income:
Cash and equivalents	$ 0	$ 3	$ 2	$ 6
Cash and investments segregated under federal or other regulations	3	6	11	12
Investment securities	272	368	557	733
Margin receivables	68	130	162	256
Loans	16	28	37	56
Broker-related receivables and other	0	3	4	7
Subtotal interest income	359	538	773	1,070
Other interest revenue(1)	50	22	79	45
Total interest income	409	560	852	1,115
Interest expense:
Brokerage sweep deposits	2	18	7	38
Bank sweep deposits	0	0	13	0
Savings deposits	0	23	3	38
Customer payables	1	8	5	17
Broker-related payables and other	0	1	0	2
Other borrowings	1	4	2	6
Corporate debt	13	14	27	28
Subtotal interest expense	17	68	57	129
Other interest expense(2)	4	2	7	4
Total interest expense	21	70	64	133
Net interest income	$ 388	$ 490	$ 788	$ 982