Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Cash Flows from Operating Activities
Net income		$ 795	$ 964
Adjustments to reconcile net income to net cash provided by (used for) operating activities:
Share-based compensation		56	56
Depreciation and amortization		96	83
Premium amortization, net, on available for sale and held to maturity securities		190	68
Other		83	33
Net change in:
Investments segregated and on deposit for regulatory purposes		(3,810)	(1,520)
Receivables from brokerage clients		2,763	1,121
Other assets		187	(58)
Payables to brokerage clients		10,031	(3,025)
Accrued expenses and other liabilities		(273)	(317)
Net cash provided by (used for) operating activities		10,118	(2,595)
Cash Flows from Investing Activities
Purchases of available for sale securities		(27,769)	(1,132)
Proceeds from sales of available for sale securities		69	10,652
Principal payments on available for sale securities		10,191	6,039
Purchases of held to maturity securities		0	(1,235)
Principal payments on held to maturity securities		0	3,996
Net change in bank loans		(1,327)
Net change in bank loans			81
Purchases of equipment, office facilities, and property		(156)	(139)
Purchases of Federal Home Loan Bank stock		0	(2)
Purchases of Federal Reserve stock		(182)	0
Other investing activities		(22)	25
Net cash provided by (used for) investing activities		(19,196)	18,285
Cash Flows from Financing Activities
Net change in bank deposits		57,383	(11,969)
Issuance of long-term debt		1,089	0
Dividends paid		(281)	(276)
Proceeds from stock options exercised		23	26
Other financing activities		(6)	(10)
Net cash provided by (used for) financing activities		58,208	(12,229)
Increase (Decrease) in Cash and Cash Equivalents, including Amounts Restricted		49,130	3,461
Cash and Cash Equivalents, including Amounts Restricted at Beginning of Period		45,577	38,227
Cash and Cash Equivalents, including Amounts Restricted at End of Period	[1]	94,707	41,688
Non-cash investing activity:
Securities transferred from held to maturity to available for sale, at fair value		136,099	8,771
Securities purchased during the period but settled after period end		2,634	0
Additions of equipment, office facilities, and property		94	42
Non-cash financing activity:
Extinguishment of finance lease obligation through an assignment agreement		0	52
Cash paid during the period for:
Interest		169	336
Income taxes		20	23
Amounts included in the measurement of lease liabilities		37	32
Leased assets obtained in exchange for new operating lease liabilities		$ 64	$ 28

[1] For more information on the nature of restrictions on restricted cash and cash equivalents, see Note 14.