Condensed Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash Flows from Operating Activities
Net income	$ 302us-gaap_NetIncomeLoss	$ 326us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash (used for) provided by operating activities:
Provision for loan losses	(4)us-gaap_ProvisionForLoanLossesExpensed	1us-gaap_ProvisionForLoanLossesExpensed
Stock-based compensation	39us-gaap_ShareBasedCompensation	29us-gaap_ShareBasedCompensation
Depreciation and amortization	54us-gaap_DepreciationAndAmortization	48us-gaap_DepreciationAndAmortization
Premium amortization, net, on securities available for sale and securities held to maturity	38	27
Other	(2)us-gaap_OtherNoncashIncomeExpense	2us-gaap_OtherNoncashIncomeExpense
Net change in:
Cash and investments segregated and on deposit for regulatory purposes	1,397	3,005
Receivables from brokers, dealers, and clearing organizations	12	29
Receivables from brokerage clients	(345)	(622)
Other securities owned	(141)	61
Other assets	(21)	(24)
Payables to brokers, dealers, and clearing organizations	345	293
Payables to brokerage clients	(2,688)	(3,025)
Accrued expenses and other liabilities	(291)	(81)
Net cash (used for) provided by operating activities	(1,305)	69
Cash Flows from Investing Activities
Purchases of securities available for sale	(8,057)	(4,250)
Proceeds from sales of securities available for sale	150	1,285
Principal payments on securities available for sale	1,412	1,738
Purchases of securities held to maturity	(2,658)	(2,271)
Principal payments on securities held to maturity	767	520
Net increase in bank loans	(221)	(171)
Purchase of equipment, office facilities, and property	(55)	(53)
Other investing activities		(8)
Net cash used for investing activities	(8,662)	(3,210)
Cash Flows from Financing Activities
Net change in bank deposits	6,688us-gaap_IncreaseDecreaseInDeposits	2,619us-gaap_IncreaseDecreaseInDeposits
Issuance of long-term debt	998
Repayment of long-term debt	(2)us-gaap_RepaymentsOfLongTermDebt	(2)us-gaap_RepaymentsOfLongTermDebt
Dividends paid	(100)us-gaap_PaymentsOfDividends	(100)us-gaap_PaymentsOfDividends
Proceeds from stock options exercised and other	28	65
Other financing activities	3	4
Net cash provided by financing activities	7,615	2,586
Decrease in Cash and Cash Equivalents	(2,352)	(555)
Cash and Cash Equivalents at Beginning of Period	11,363	7,728
Cash and Cash Equivalents at End of Period	9,011	7,173
Cash paid during the period for:
Interest	46us-gaap_InterestPaid	40us-gaap_InterestPaid
Income taxes	54us-gaap_IncomeTaxesPaid	51us-gaap_IncomeTaxesPaid
Non-cash investing activity:
Securities purchased during the period but settled after period end	$ 60us-gaap_TransferToInvestments	$ 158us-gaap_TransferToInvestments

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The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes.

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The amount of cash paid for interest during the period.

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Amount of cash inflow (outflow) of investing activities, excluding discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

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