The Charles Schwab Corporation (SCHW) 10-Q 7 Nov 18 2018 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2018	Oct. 31, 2018
Document and Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q3
Trading Symbol	SCHW
Entity Registrant Name	SCHWAB CHARLES CORP
Entity Central Index Key	316,709
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		1,350,452,801

Condensed Consolidated Statemen

Condensed Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net Revenues
Interest revenue		$ 1,755	$ 1,176	$ 4,766	$ 3,358
Interest expense		(228)	(94)	(569)	(223)
Net interest revenue		1,527	1,082	4,197	3,135
Asset management and administration fees		809	861	2,474	2,529
Trading revenue		176	151	557	500
Other		67	71	235	212
Total net revenues		2,579	2,165	7,463	6,376
Expenses Excluding Interest
Compensation and benefits		737	662	2,252	2,026
Professional services		164	152	476	429
Occupancy and equipment		124	111	368	323
Advertising and market development		70	63	220	205
Communications		59	56	179	171
Depreciation and amortization		78	69	226	200	[1]
Regulatory fees and assessments		57	43	158	133
Other		71	64	232	192
Total expenses excluding interest		1,360	1,220	4,111	3,679
Income before taxes on income		1,219	945	3,352	2,697
Taxes on income		296	327	780	940
Net Income		923	618	2,572	1,757	[1]
Preferred stock dividends and other	[2]	38	43	128	127
Net Income Available to Common Stockholders		$ 885	$ 575	$ 2,444	$ 1,630
Weighted-Average Common Shares Outstanding:
Basic (shares)		1,351	1,339	1,349	1,338
Diluted (shares)	[3]	1,364	1,353	1,363	1,352
Earnings Per Common Shares Outstanding:
Basic (USD per share)		$ 0.66	$ 0.43	$ 1.81	$ 1.22
Diluted (USD per share)		0.65	0.42	1.79	1.21
Dividends Declared Per Common Share (USD per share)		$ 0.13	$ 0.08	$ 0.33	$ 0.24
[1]	Adjusted for the retrospective adoption of ASU 2016-18. See Note 2.
[2]	Includes preferred stock dividends and undistributed earnings and dividends allocated to non-vested restricted stock units.
[3]	Antidilutive stock options and restricted stock units excluded from the calculation of diluted EPS totaled 11 million and 9 million shares for the third quarters of 2018 and 2017, respectively, and 12 million and 10 million shares for the first nine months of 2018 and 2017, respectively.

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 923	$ 618	$ 2,572	$ 1,757	[1]
Change in net unrealized gain (loss) on available for sale securities:
Net unrealized gain (loss)	(43)	0	(184)	81
Reclassification of net unrealized loss transferred to held to maturity	0	0	0	227
Other reclassifications included in other revenue	0	0	0	(7)
Change in net unrealized gain (loss) on held to maturity securities:
Reclassification of net unrealized loss transferred from available for sale	0	0	0	(227)
Amortization of amounts previously recorded upon transfer from available for sale	8	10	26	21
Other	0	0	0	(3)
Other comprehensive income (loss), before tax	(35)	10	(158)	92
Income tax effect	9	(4)	39	(35)
Other comprehensive income (loss), net of tax	(26)	6	(119)	57
Comprehensive Income	$ 897	$ 624	$ 2,453	$ 1,814
[1]	Adjusted for the retrospective adoption of ASU 2016-18. See Note 2.

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2018		Dec. 31, 2017
Assets
Cash and cash equivalents	$ 21,830	[1]	$ 14,217
Cash and investments segregated and on deposit for regulatory purposes (including resale agreements of $4,424 at September 30, 2018 and $6,596 at December 31, 2017)	8,487		15,139
Receivables from brokers, dealers, and clearing organizations	798		649
Receivables from brokerage clients — net	22,411		20,576
Other securities owned — at fair value	500		539
Available for sale securities	57,558		49,995
Held to maturity securities	138,952		120,926
Bank loans — net	16,564		16,478
Equipment, office facilities, and property — net	1,683		1,471
Goodwill	1,227		1,227
Other assets	2,092		2,057
Total assets	272,102		243,274
Liabilities and Stockholders’ Equity
Bank deposits	213,408		169,656
Payables to brokers, dealers, and clearing organizations	1,522		1,287
Payables to brokerage clients	27,851		31,243
Accrued expenses and other liabilities	2,697		2,810
Short-term borrowings	0		15,000
Long-term debt	5,790		4,753
Total liabilities	251,268		224,749
Stockholders’ equity:
Preferred stock — $.01 par value per share; aggregate liquidation preference of $2,850	2,793		2,793
Common stock — 3 billion shares authorized; $.01 par value per share; 1,487,543,446 shares issued	15		15
Additional paid-in capital	4,484		4,353
Retained earnings	16,615		14,408
Treasury stock, at cost — 135,806,047 shares at September 30, 2018 and 142,210,890 shares at December 31, 2017	(2,769)		(2,892)
Accumulated other comprehensive income (loss)	(304)		(152)
Total stockholders’ equity	20,834		18,525
Total liabilities and stockholders’ equity	$ 272,102		$ 243,274
[1]	Reconciliation of cash, cash equivalents and amounts reported within the balance sheet

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Cash and investments segregated and on deposit for regulatory purposes, resale agreements	$ 4,424	$ 6,596
Preferred stock, par value (USD per share)	$ 0.01	$ 0.01
Preferred stock, aggregate liquidation preference	$ 2,850	$ 2,850
Common stock, shares authorized (shares)	3,000,000,000	3,000,000,000
Common stock, par value (USD per share)	$ 0.01	$ 0.01
Common stock, shares issued (shares)	1,487,543,446	1,487,543,446
Treasury stock (shares)	135,806,047	142,210,890

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Stockholders' Equity - USD ($) shares in Millions, $ in Millions	Total		Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock, at cost [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Beginning balance at Dec. 31, 2016	$ 16,421		$ 2,783	$ 15	$ 4,267	$ 12,649	$ (3,130)	$ (163)
Beginning balance (shares) at Dec. 31, 2016				1,488
Increase (Decrease) in Stockholders' Equity
Net income	1,757	[1]				1,757
Other comprehensive income (loss), net of tax	57							57
Dividends declared on preferred stock	(120)					(120)
Dividends declared on common stock	(323)					(323)
Stock option exercises and other	98				(30)		128
Share-based compensation and related tax effects	105				105
Other	32				23		9
Ending balance (shares) at Sep. 30, 2017				1,488
Ending balance at Sep. 30, 2017	18,027		2,783	$ 15	4,365	13,963	(2,993)	(106)
Increase (Decrease) in Stockholders' Equity
Adoption of accounting standards (Note 2) | Accounting Standards Update 2014-09 and 2018-02 [Member]	167					200		(33)
Beginning balance at Dec. 31, 2017	18,525		2,793	$ 15	4,353	14,408	(2,892)	(152)
Beginning balance (shares) at Dec. 31, 2017				1,488
Increase (Decrease) in Stockholders' Equity
Net income	2,572					2,572
Other comprehensive income (loss), net of tax	(119)							(119)
Dividends declared on preferred stock	(117)					(117)
Dividends declared on common stock	(448)					(448)
Stock option exercises and other	108				(8)		116
Share-based compensation and related tax effects	106				106
Other	40				33		7
Ending balance (shares) at Sep. 30, 2018				1,488
Ending balance at Sep. 30, 2018	$ 20,834		$ 2,793	$ 15	$ 4,484	$ 16,615	$ (2,769)	$ (304)
[1]	Adjusted for the retrospective adoption of ASU 2016-18. See Note 2.

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017
Cash Flows from Operating Activities
Net income		$ 2,572	$ 1,757	[1]
Adjustments to reconcile net income to net cash provided by (used for) operating activities:
Share-based compensation		113	111	[1]
Depreciation and amortization		226	200	[1]
Premium amortization, net, on available for sale and held to maturity securities		276	240	[1]
Other		108	35	[1]
Net change in:
Investments segregated and on deposit for regulatory purposes		6,973	6,864	[1]
Receivables from brokers, dealers, and clearing organizations		(147)	61	[1]
Receivables from brokerage clients		(1,858)	(1,310)	[1]
Other securities owned		39	22	[1]
Other assets		(143)	(76)	[1]
Payables to brokers, dealers, and clearing organizations		43	(957)	[1]
Payables to brokerage clients		(3,392)	(4,414)	[1]
Accrued expenses and other liabilities		(155)	(82)	[1]
Net cash provided by operating activities		4,655	2,451	[1]
Cash Flows from Investing Activities
Purchases of available for sale securities		(19,781)	(6,375)	[1]
Proceeds from sales of available for sale securities		115	5,773	[1]
Principal payments on available for sale securities		12,091	6,532	[1]
Purchases of held to maturity securities		(30,639)	(19,886)	[1]
Principal payments on held to maturity securities		12,382	7,927	[1]
Net increase in bank loans		(86)	(829)	[1]
Purchases of equipment, office facilities, and property		(400)	(267)	[1]
Purchases of Federal Home Loan Bank stock		(156)	(160)	[1]
Proceeds from sales of Federal Home Loan Bank stock		528	106	[1]
Other investing activities		(74)	(52)	[1]
Net cash provided by (used for) investing activities		(26,020)	(7,231)	[1]
Cash Flows from Financing Activities
Net change in bank deposits		43,752	1,809	[1]
Net change in short-term borrowings		(15,000)	5,000	[1]
Issuance of long-term debt		1,936	643	[1]
Repayment of long-term debt		(906)	(256)	[1]
Dividends paid		(579)	(456)	[1]
Proceeds from stock options exercised and other		108	98	[1]
Other financing activities		(12)	(10)	[1]
Net cash provided by (used for) financing activities		29,299	6,828	[1]
Increase (Decrease) in Cash and Cash Equivalents, including Amounts Restricted		7,934	2,048	[1]
Cash and Cash Equivalents including Amounts Restricted at Beginning of Year		19,160	17,873	[1]
Cash and Cash Equivalents, including Amounts Restricted at End of Period	[2]	27,094	19,921	[1]
Cash paid during the period for:
Interest		550	233
Income taxes		649	890
Non-cash investing activity:
Securities purchased during the period but settled after period end		$ 221	$ 3,977
[1]	Adjusted for the retrospective adoption of ASU 2016-18. See Note 2.
[2]	Reconciliation of cash, cash equivalents and amounts reported within the balance sheet

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Millions		Sep. 30, 2018	Sep. 30, 2017	[2]
Reconciliation of cash, cash equivalents and amounts reported within the balance sheet
Cash and cash equivalents	[1]	$ 21,830	$ 12,253
Restricted cash and cash equivalents amounts included in cash and investments segregated and on deposit for regulatory purposes	[1]	5,264	7,668
Total cash and cash equivalents, including amounts restricted shown in the statement of cash flows	[1]	$ 27,094	$ 19,921
[1]	Reconciliation of cash, cash equivalents and amounts reported within the balance sheet
[2]	Adjusted for the retrospective adoption of ASU 2016-18. See Note 2.

Introduction and Basis of Prese

Introduction and Basis of Presentation	9 Months Ended
	Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Introduction and Basis of Presentation	Introduction and Basis of Presentation The Charles Schwab Corporation (CSC) is a savings and loan holding company engaged, through its subsidiaries, in wealth management, securities brokerage, banking, asset management, custody, and financial advisory services. Significant business subsidiaries of CSC include the following: • Charles Schwab & Co., Inc. (CS&Co), a securities broker-dealer; • Charles Schwab Bank (CSB), a federal savings bank; and • Charles Schwab Investment Management, Inc. (CSIM), the investment advisor for Schwab’s proprietary mutual funds (Schwab Funds ® ) and Schwab’s exchange-traded funds (Schwab ETFs™). Unless otherwise indicated, the terms “Schwab,” “the Company,” “we,” “us,” or “our” mean CSC together with its consolidated subsidiaries. These unaudited condensed consolidated financial statements have been prepared in conformity with generally accepted accounting principles in the U.S. (GAAP), which require management to make certain estimates and assumptions that affect the reported amounts in the accompanying financial statements, and in the related disclosures. These estimates are based on information available as of the date of the condensed consolidated financial statements. While management makes its best judgment, actual amounts or results could differ from these estimates. In the opinion of management, all normal, recurring adjustments have been included for a fair statement of this interim financial information. These condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto, included in Schwab’s 2017 Form 10-K. The significant accounting policies are included in Note 2 in the 2017 Form 10-K. There have been no significant changes to these accounting policies during the first nine months of 2018 , except as described in Note 2 below. Principles of Consolidation Schwab evaluates all entities in which it has financial interests for consolidation, except for money market funds, which are specifically excluded from consolidation guidance. When an entity is evaluated for consolidation, Schwab determines whether its interest in the entity constitutes a controlling financial interest under either the variable interest entity (VIE) model or a voting interest entity (VOE) model. In evaluating whether Schwab’s interest in a VIE is a controlling financial interest, we consider whether our involvement, in the context of the design, purpose, and risks of the VIE, as well as any involvement of related parties, provides us with (i) the power to direct the most significant activities of the VIE, and (ii) the obligation to absorb losses or receive benefits that are significant to the VIE. If both of these conditions exist, then Schwab would be the primary beneficiary of that VIE, and consolidate it. Based upon the assessments for all of our interests in VIEs, there are no cases where Schwab is the primary beneficiary; therefore, we are not required to consolidate any VIEs. Schwab consolidates all VOEs in which it has majority-voting interests. Investments in entities in which Schwab does not have a controlling financial interest are accounted for under the equity method of accounting when we have the ability to exercise significant influence over operating and financing decisions of the entity. Investments in entities for which Schwab does not have the ability to exercise significant influence are generally carried at cost and adjusted for impairment and observable price changes of the identical or similar investments of the same issuer (adjusted cost method), except for certain investments in qualified affordable housing projects which are accounted for under the proportional amortization method. All equity method, adjusted cost method, and proportional amortization method investments are included in other assets on the condensed consolidated balance sheets.

New Accounting Standards

New Accounting Standards	9 Months Ended
	Sep. 30, 2018
Accounting Changes and Error Corrections [Abstract]
New Accounting Standards	New Accounting Standards Adoption of New Accounting Standards Standard Description Date of Adoption Effects on the Financial Statements or Other Significant Matters Accounting Standards Update (ASU) 2014-09, “Revenue from Contracts with Customers (Topic 606)” and related ASUs Clarifies that revenue from contracts with clients should be recognized in a manner that depicts the timing of the related transfer of goods or performance of services at an amount that reflects the expected consideration. January 1, 2018 The guidance does not apply to revenue earned from the Company’s loans and securities. Accordingly, net interest revenue was not impacted. The primary impact for the Company was the capitalization on the consolidated balance sheets of sales commissions paid to employees for obtaining new contracts with clients. These capitalized costs resulted in an asset of $219 million and a related deferred tax liability of $52 million upon adoption. The asset is being amortized to expense over time as the related revenues are recognized. ASU 2016-01, “Financial Instruments – Overall (Subtopic 825-10)” and ASU 2018-03, “Technical Corrections and Improvements to Financial Instruments – Overall (Subtopic 825-10)” Requires: (i) equity investments to be measured at fair value, with changes in fair value recognized in net income, unless the equity method is applied or the equity investments do not have readily determinable fair values in which case a practical alternative may be elected; (ii) use of an exit price when measuring the fair value of financial instruments for disclosures; (iii) separate presentation of financial assets and liabilities by measurement category and form of instrument on the balance sheet or in the accompanying notes. January 1, 2018 The Company adopted this guidance on a prospective basis for its equity securities that do not have readily determinable fair values. No other significant changes resulted from adoption. Therefore, there was no material impact on the Company’s financial statements. ASU 2016-18, “Statement of Cash Flows (Topic 230) – Restricted Cash a Consensus of the Emerging Issues Task Force” Requires that the statement of cash flows explain the change during the period in the total cash and cash equivalents, including restricted cash and cash equivalents. January 1, 2018 The Company adopted this guidance on a retrospective basis. The Company has significant amounts of restricted cash and cash equivalents due to its business as a broker-dealer. Standard Description Date of Adoption Effects on the Financial Statements or Other Significant Matters ASU 2018-02, “Income Statement – Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income” Permits reclassification of the impacts on certain tax affected items included in AOCI that were adjusted through income from continuing operations rather than AOCI upon the effective date of the Tax Act. January 1, 2018 The Company adopted this guidance as of January 1, 2018. The Company elected to reclassify the income tax effects of the Tax Act from items in AOCI into retained earnings as of the beginning of the period of adoption. New Accounting Standards Not Yet Adopted Standard Description Required Date of Adoption Effects on the Financial Statements or Other Significant Matters ASU 2016-02, “Leases (Topic 842)” Amends the accounting for leases by lessees and lessors. The primary change from the new guidance is the recognition of right-of-use assets and lease liabilities by lessees for those leases classified as operating leases. Additional changes include accounting for lease origination and executory costs, required lessee reassessments during the lease term due to changes in circumstances, and expanded lease disclosures. January 1, 2019 The Company plans to adopt the new lease accounting guidance prospectively as of January 1, 2019 with a cumulative-effect adjustment to the opening balance of retained earnings (i.e., prior periods will not be adjusted). The Company does not expect this guidance will have a material impact on its earnings per common share (EPS). However, it will result in a gross up of the consolidated balance sheet due to recognition of right-of-use assets and lease liabilities primarily related to leases of office space and branches. These amounts will be based on the present value of our remaining operating lease payments (see Note 13 in the 2017 10-K for the undiscounted rental commitments for operating leases). The Company is refining its methodology to estimate the right-of-use assets and lease liabilities. We are also testing system updates and refining internal controls for applying the lease accounting changes. Based upon our current population of leases, we expect the right-of-use asset and corresponding lease liability to be less than 0.5% of our total assets. Standard Description Required Date of Adoption Effects on the Financial Statements or Other Significant Matters ASU 2016-13, “Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments” Provides guidance for recognizing impairment of most debt instruments measured at amortized cost, including loans and held to maturity (HTM) debt securities. Requires estimating current expected credit losses (CECL) over the remaining life of an instrument or a portfolio of instruments with similar risk characteristics based on relevant information about past events, current conditions, and reasonable forecasts. The initial estimate of, and the subsequent changes in, CECL will be recognized as credit loss expense through current earnings and will be reflected as an allowance for credit losses offsetting the carrying value of the financial instrument(s) on the balance sheet. Amends the OTTI model for available for sale (AFS) debt securities by requiring the use of an allowance, rather than directly reducing the carrying value of the security, and eliminating consideration of the length of time such security has been in an unrealized loss position as a factor in concluding whether a credit loss exists. January 1, 2020 (early adoption permitted) The Company continues to evaluate the impact of this guidance on its financial statements, including EPS. The Company has finished the majority of its scoping work and assessment of the current state of data and systems. Work is transitioning to designing and building out approaches to address certain asset classes with a focus primarily on a subset of our securities, including corporate debt securities. The Company expects that a large portion of its securities will have zero expectation of credit losses based on industry and regulator views for U.S. treasury and certain government agency-backed securities. We are currently working on in-depth analysis for the other asset types that do not have zero expectation of credit losses to determine our methods and any needed changes to policies and procedures. ASU 2017-08, “Receivables – Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities” Shortens the amortization period for the premium on certain callable debt securities to the earliest call date. The amendments are applicable to any purchased individual debt security with an explicit and noncontingent call feature with a fixed price on a preset date. ASU 2017-08 does not impact the accounting for callable debt securities held at a discount. January 1, 2019 (early adoption permitted) While still under evaluation, the Company does not expect this guidance will have a material impact on its financial statements, including EPS. Standard Description Required Date of Adoption Effects on the Financial Statements or Other Significant Matters ASU 2018-15, “Intangibles–Goodwill and Other–Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract (a consensus of the FASB Emerging Issues Task Force)” Aligns the criteria for capitalizing implementation costs for cloud computing arrangements (CCA) that are service contracts with internal-use software that is developed or purchased and CCAs that include an internal-use software license. This guidance requires that the capitalized implementation costs be recognized over the period of the CCA service contract, subject to impairment evaluation on an ongoing basis. The guidance prescribes the balance sheet, income statement, and statement of cash flow classification of the capitalized implementation costs and related amortization expense, and requires additional quantitative and qualitative disclosures. Adoption provides for retrospective or prospective application to all implementation costs incurred after the date of adoption. January 1, 2020 (early adoption permitted) Historically, Schwab has expensed implementation costs as they are incurred for CCAs that are service contracts. Therefore, adopting this guidance will change the Company’s accounting treatment for these types of implementation costs. The Company is evaluating the impacts of this guidance on its financial statements, including EPS. The cumulative effect of the changes made to our consolidated January 1, 2018 balance sheet for the adoption of ASU 2014-09, “Revenue – Revenue from Contracts with Customers” and ASU 2018-02, “Other Comprehensive Income – Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income” were as follows: Balance at Adjustments Due to ASU 2014-09 Adjustments Due to ASU 2018-02 Balance at Assets Other assets (1) $ 2,057 $ 167 $ — $ 2,224 Stockholders’ Equity Retained earnings 14,408 167 33 14,608 Accumulated other comprehensive income (152 ) — (33 ) (185 ) (1) Adjustment is comprised of an increase in capitalized contract costs of $219 million , partially offset by an increase in deferred tax liabilities of $52 million . In accordance with the new revenue standard requirements, the disclosure of the impact of adoption on our condensed consolidated statement of income and condensed consolidated balance sheet were as follows: Three Months Ended September 30, 2018 Statement of Income As Reported Balances Without Adoption of ASU 2014-09 Effect of Change Expenses Excluding Interest Compensation and benefits $ 737 $ 744 $ (7 ) Taxes on income 296 294 2 Net Income 923 918 5 Nine Months Ended September 30, 2018 Statement of Income As Reported Balances Without Adoption of ASU 2014-09 Effect of Change Expenses Excluding Interest Compensation and benefits $ 2,252 $ 2,279 $ (27 ) Taxes on income 780 773 7 Net Income 2,572 2,552 20 As of September 30, 2018 Balance Sheet As Reported Balances Without Adoption of ASU 2014-09 Effect of Change Assets Other assets (1) $ 2,092 $ 1,905 $ 187 Stockholders’ Equity Retained earnings 16,615 16,428 187 (1) Adjustment is comprised of an increase in capitalized contract costs of $246 million , partially offset by an increase in deferred tax liabilities of $59 million .

Revenue Recognition

Revenue Recognition	9 Months Ended
	Sep. 30, 2018
Revenue from Contract with Customer [Abstract]
Revenue Recognition	Revenue Recognition Disaggregated Revenue Disaggregation of Schwab’s revenue by major source is as follows: Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 Net interest revenue Interest revenue $ 1,755 $ 1,176 $ 4,766 $ 3,358 Interest expense (228 ) (94 ) (569 ) (223 ) Net interest revenue 1,527 1,082 4,197 3,135 Asset management and administration fees Mutual funds and ETF service fees 435 519 1,386 1,538 Advice solutions 294 265 859 765 Other 80 77 229 226 Asset management and administration fees 809 861 2,474 2,529 Trading revenue Commissions 155 136 501 456 Principal transactions 21 15 56 44 Trading revenue 176 151 557 500 Other 67 71 235 212 Total net revenues $ 2,579 $ 2,165 $ 7,463 $ 6,376 For a summary of revenue provided by our reportable segments, see Note 17. The recognition of revenue is not impacted by the operating segment in which revenue is generated. Net interest revenue Net interest revenue, which is generated from financial instruments covered by various other areas of GAAP, is not within the scope of Accounting Standards Codification (ASC) 606, Revenue From Contracts With Customers (ASC 606), and is included in the table above in order to reconcile to total net revenues per the condensed consolidated statement of income. Net interest revenue is the difference between interest generated on interest earning assets and interest paid on funding sources. Our primary interest earning assets include cash and cash equivalents; segregated cash and investments; margin loans, which constitute the majority of receivables from brokerage clients; investment securities; and bank loans. Revenue on interest earning assets is affected by various factors, such as the composition of assets, prevailing interest rates at the time of origination or purchase, changes in interest rates on floating rate securities, and changes in prepayment levels for mortgage related securities and loans. Fees earned on securities borrowing and lending activities, which are conducted by CS&Co on assets held in client brokerage accounts, are included in other interest revenue and expense. Asset management and administration fees The majority of asset management and administration fees are generated through our proprietary and third-party mutual fund and ETF offerings, as well as fee-based advisory solutions. Mutual fund and ETF service fees are charged for investment management, shareholder, and administration services provided to Schwab Funds ® and Schwab ETFs™, as well as recordkeeping, shareholder, and administration services provided to third-party funds. Advice solutions fees are charged for brokerage and asset management services provided to advice solutions clients. Both mutual fund and ETF service fees and advice solutions fees are earned and recognized over time. Fees are generally based on a percentage of the daily value of assets under management and are collected on a monthly or quarterly basis. Trading revenue Substantially all trading revenue is generated through commissions earned for executing trades for clients in individual equities, options, fixed income securities, and certain third-party mutual funds and ETFs. This revenue is earned and collected when the trades are executed. Other revenue Other revenue includes order flow revenue, other service fees, software fees from our portfolio management solutions, exchange processing fees, and nonrecurring gains. Generally, the most significant portion of other revenue is order flow revenue, which are payments received from execution venues to which CS&Co sends equity and option orders. Order flow revenue is recognized when the trades are executed. Capitalized contract costs Deferred contract costs relate to sales commissions paid to employees for obtaining contracts with clients and are included in other assets on the condensed consolidated balance sheets. These costs are amortized to expense on a straight-line basis over a period that is consistent with how the related revenue is recognized. At September 30, 2018 and January 1, 2018, we had $246 million and $219 million of deferred contract costs, respectively. Amortization expense related to deferred contract costs was $12 million and $34 million for the third quarter and first nine months of 2018 , respectively, which was recorded in compensation and benefits expense on the condensed consolidated statements of income. Contract balances Receivables from contracts with customers within the scope of ASC 606 were $353 million at January 1, 2018 and $359 million at September 30, 2018 and were recorded in other assets on the condensed consolidated balance sheets. Schwab does not have any other significant contract assets or contract liability balances as of September 30, 2018 and January 1, 2018. Unsatisfied performance obligations We do not have any unsatisfied performance obligations other than those that are subject to an elective practical expedient under ASC 606. The practical expedient applies to and is elected for contracts where we recognize revenue at the amount to which we have the right to invoice for services performed.

Investment Securities

Investment Securities	9 Months Ended
	Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities The amortized cost, gross unrealized gains and losses, and fair value of AFS and HTM securities are as follows: September 30, 2018 Amortized Gross Gross Fair Available for sale securities U.S. agency mortgage-backed securities $ 24,010 $ 47 $ 102 $ 23,955 U.S. Treasury securities 12,412 — 169 12,243 Asset-backed securities (1) 9,378 19 10 9,387 Corporate debt securities (2) 6,921 10 9 6,922 Certificates of deposit 2,765 4 — 2,769 U.S. agency notes 1,688 — 6 1,682 Commercial paper (2,3) 518 — — 518 Foreign government agency securities 50 — 2 48 Non-agency commercial mortgage-backed securities 34 — — 34 Total available for sale securities $ 57,776 $ 80 $ 298 $ 57,558 Held to maturity securities U.S. agency mortgage-backed securities $ 113,453 $ 26 $ 3,483 $ 109,996 Asset-backed securities (1) 17,964 122 12 18,074 Corporate debt securities (2) 4,578 8 55 4,531 U.S. state and municipal securities 1,330 6 7 1,329 Non-agency commercial mortgage-backed securities 1,149 1 25 1,125 U.S. Treasury securities 223 — 11 212 Certificates of deposit 200 1 — 201 Foreign government agency securities 50 — 2 48 Other 5 — — 5 Total held to maturity securities $ 138,952 $ 164 $ 3,595 $ 135,521 December 31, 2017 Available for sale securities U.S. agency mortgage-backed securities $ 20,915 $ 53 $ 39 $ 20,929 U.S. Treasury securities 9,583 — 83 9,500 Asset-backed securities (1) 9,019 34 6 9,047 Corporate debt securities (2) 6,154 16 1 6,169 Certificates of deposit 2,040 2 1 2,041 U.S. agency notes 1,914 — 8 1,906 Commercial paper (2) 313 — — 313 Foreign government agency securities 51 — 1 50 Non-agency commercial mortgage-backed securities 40 — — 40 Total available for sale securities $ 50,029 $ 105 $ 139 $ 49,995 Held to maturity securities U.S. agency mortgage-backed securities $ 101,197 $ 290 $ 1,034 $ 100,453 Asset-backed securities (1) 12,937 127 2 13,062 Corporate debt securities (2) 4,078 13 5 4,086 U.S. state and municipal securities 1,247 57 — 1,304 Non-agency commercial mortgage-backed securities 994 10 5 999 U.S. Treasury securities 223 — 3 220 Certificates of deposit 200 — — 200 Foreign government agency securities 50 — 1 49 Total held to maturity securities $ 120,926 $ 497 $ 1,050 $ 120,373 (1) Approximately 37% and 42% of asset-backed securities held as of September 30, 2018 and December 31, 2017 , respectively, were Federal Family Education Loan Program Asset-Backed Securities. Asset-backed securities collateralized by credit card receivables represented approximately 43% and 40% of the asset-backed securities held as of September 30, 2018 and December 31, 2017 , respectively. (2) As of September 30, 2018 and December 31, 2017 , approximately 31% and 41% , respectively, of the total AFS and HTM investments in corporate debt securities and commercial paper were issued by institutions in the financial services industry. Approximately 18% and 22% of the holdings of these securities were issued by institutions in the information technology industry as of September 30, 2018 and December 31, 2017 , respectively. (3) Included in cash and cash equivalents on the condensed consolidated balance sheet, but excluded from this table is $2.0 billion of AFS commercial paper. These holdings have maturities of three months or less and an aggregate market value equal to amortized cost. At September 30, 2018 , certain banking subsidiaries had pledged securities with a fair value of $21.5 billion as collateral to secure borrowing capacity on secured credit facilities with the FHLB (see Note 8). We also pledge certain investment securities as collateral to secure borrowing capacity at the Federal Reserve Bank discount window, and had pledged securities with a fair value of $2.4 billion as collateral for this facility at September 30, 2018 . CSB also pledges securities issued by federal agencies to secure certain trust deposits. The fair value of these pledged securities was $898 million at September 30, 2018 . Securities with unrealized losses, aggregated by category and period of continuous unrealized loss, are as follows:  Less than 12 months  12 months or longer Total September 30, 2018 Fair Unrealized Fair Unrealized Fair Unrealized Available for sale securities U.S. agency mortgage-backed securities $ 10,119 $ 68 $ 1,988 $ 34 $ 12,107 $ 102 U.S. Treasury securities 7,770 72 4,374 97 12,144 169 Asset-backed securities 1,841 4 601 6 2,442 10 Corporate debt securities 3,030 8 229 1 3,259 9 U.S. agency notes 566 2 1,116 4 1,682 6 Foreign government agency securities — — 48 2 48 2 Total $ 23,326 $ 154 $ 8,356 $ 144 $ 31,682 $ 298 Held to maturity securities U.S. agency mortgage-backed securities $ 59,643 $ 1,247 $ 40,279 $ 2,236 $ 99,922 $ 3,483 Asset-backed securities 2,115 12 39 — 2,154 12 Corporate debt securities 2,862 52 77 3 2,939 55 U.S. state and municipal securities 471 5 14 2 485 7 Non-agency commercial mortgage-backed securities 651 15 279 10 930 25 U.S. Treasury securities — — 212 11 212 11 Foreign government agency securities — — 48 2 48 2 Total $ 65,742 $ 1,331 $ 40,948 $ 2,264 $ 106,690 $ 3,595 Total securities with unrealized losses (1) $ 89,068 $ 1,485 $ 49,304 $ 2,408 $ 138,372 $ 3,893 December 31, 2017 Available for sale securities U.S. agency mortgage-backed securities $ 5,696 $ 21 $ 2,548 $ 18 $ 8,244 $ 39 U.S. Treasury securities 4,625 11 4,875 72 9,500 83 Asset-backed securities 904 3 424 3 1,328 6 Corporate debt securities 736 1 120 — 856 1 Certificates of deposit 799 1 — — 799 1 U.S. agency notes 99 — 1,807 8 1,906 8 Foreign government agency securities 50 1 — — 50 1 Total $ 12,909 $ 38 $ 9,774 $ 101 $ 22,683 $ 139 Held to maturity securities U.S. agency mortgage-backed securities $ 42,102 $ 310 $ 24,753 $ 724 $ 66,855 $ 1,034 Asset-backed securities 1,124 2 72 — 1,196 2 Corporate debt securities 1,078 5 — — 1,078 5 Non-agency commercial mortgage-backed securities 607 5 — — 607 5 U.S. Treasury securities 220 3 — — 220 3 Foreign government agency securities 49 1 — — 49 1 Total $ 45,180 $ 326 $ 24,825 $ 724 $ 70,005 $ 1,050 Total securities with unrealized losses (2) $ 58,089 $ 364 $ 34,599 $ 825 $ 92,688 $ 1,189 (1) The number of investment positions with unrealized losses totaled 413 for AFS securities and 1,800 for HTM securities. (2) The number of investment positions with unrealized losses totaled 251 for AFS securities and 938 for HTM securities. At September 30, 2018 , substantially all securities in the investment portfolios were rated investment grade. U.S. agency mortgage-backed securities do not have explicit credit ratings; however, management considers these to be of the highest credit quality and rating given the guarantee of principal and interest by the U.S. government or U.S. government-sponsored enterprises. Management evaluates whether investment securities are other-than-temporarily impaired (OTTI) on a quarterly basis as described in Note 2 in the 2017 Form 10-K. No amounts were recognized as OTTI in earnings or other comprehensive income in 2018 or 2017. As of September 30, 2018 and December 31, 2017 , Schwab did not hold any securities on which OTTI was previously recognized. The maturities of AFS and HTM securities are as follows: September 30, 2018 Within After 1 year After 5 years After Total Available for sale securities U.S. agency mortgage-backed securities (1) $ 169 $ 3,669 $ 10,571 $ 9,546 $ 23,955 U.S. Treasury securities 5,999 6,244 — — 12,243 Asset-backed securities 250 6,968 1,750 419 9,387 Corporate debt securities 1,621 5,301 — — 6,922 Certificates of deposit 866 1,903 — — 2,769 U.S. agency notes 1,311 371 — — 1,682 Commercial paper 518 — — — 518 Foreign government agency securities — 48 — — 48 Non-agency commercial mortgage-backed securities (1) — — — 34 34 Total fair value $ 10,734 $ 24,504 $ 12,321 $ 9,999 $ 57,558 Total amortized cost $ 10,762 $ 24,632 $ 12,368 $ 10,014 $ 57,776 Held to maturity securities U.S. agency mortgage-backed securities (1) $ 383 $ 14,370 $ 31,785 $ 63,458 $ 109,996 Asset-backed securities 5 1,611 9,373 7,085 18,074 Corporate debt securities 238 3,550 743 — 4,531 U.S. state and municipal securities — 59 254 1,016 1,329 Non-agency commercial mortgage-backed securities (1) — 353 — 772 1,125 U.S. Treasury securities — — 212 — 212 Certificates of deposit — 201 — — 201 Foreign government agency securities — 48 — — 48 Other — — — 5 5 Total fair value $ 626 $ 20,192 $ 42,367 $ 72,336 $ 135,521 Total amortized cost $ 628 $ 20,540 $ 43,339 $ 74,445 $ 138,952 (1) Mortgage-backed securities have been allocated to maturity groupings based on final contractual maturities. Actual maturities will differ from final contractual maturities because borrowers on a certain portion of loans underlying these securities have the right to prepay their obligations. Proceeds and gross realized gains and losses from sales of AFS securities are as follows: Three Months Ended Nine Months Ended 2018 2017 2018 2017 Proceeds $ — $ 288 $ 115 $ 5,773 Gross realized gains — — — 7

Bank Loans and Related Allowanc

Bank Loans and Related Allowance for Loan Losses	9 Months Ended
	Sep. 30, 2018
Receivables [Abstract]
Bank Loans and Related Allowance for Loan Losses	Bank Loans and Related Allowance for Loan Losses The composition of bank loans and delinquency analysis by loan type is as follows: September 30, 2018 Current 30-59 days 60-89 days > 90 days past (3) Total past due Total Allowance Total First Mortgages (1,2) $ 10,217 $ 24 $ 2 $ 13 $ 39 $ 10,256 $ 17 $ 10,239 HELOCs (1,2) 1,589 2 1 10 13 1,602 7 1,595 Pledged asset lines 4,552 3 1 — 4 4,556 — 4,556 Other 176 — — — — 176 2 174 Total bank loans $ 16,534 $ 29 $ 4 $ 23 $ 56 $ 16,590 $ 26 $ 16,564 December 31, 2017 First Mortgages (1,2) $ 9,983 $ 14 $ 2 $ 17 $ 33 $ 10,016 $ 16 $ 10,000 HELOCs (1,2) 1,928 — 3 12 15 1,943 8 1,935 Pledged asset lines 4,361 4 4 — 8 4,369 — 4,369 Other 176 — — — — 176 2 174 Total bank loans $ 16,448 $ 18 $ 9 $ 29 $ 56 $ 16,504 $ 26 $ 16,478 (1) First Mortgages and HELOCs include unamortized premiums and discounts and direct origination costs of $73 million and $77 million at September 30, 2018 and December 31, 2017 , respectively. (2) At September 30, 2018 and December 31, 2017 , 47% and 48% , respectively, of the First Mortgage and HELOC portfolios were concentrated in California. These loans have performed in a manner consistent with the portfolio as a whole. (3) There were no loans accruing interest that were contractually 90 days or more past due at September 30, 2018 or December 31, 2017 . At September 30, 2018 , CSB had pledged $11.1 billion of First Mortgages and HELOCs as collateral to secure borrowing capacity on a secured credit facility with the FHLB (see Note 8). Substantially all of the bank loans were collectively evaluated for impairment at September 30, 2018 and December 31, 2017 . Changes in the allowance for loan losses were as follows: September 30, 2018 September 30, 2017 Three Months Ended First Mortgages HELOCs Other Total (1) First Mortgages HELOCs Other Total (1) Balance at beginning of period $ 17 $ 7 $ 2 $ 26 $ 17 $ 8 $ 1 $ 26 Charge-offs — — — — (1 ) — — (1 ) Recoveries — 1 — 1 — — 1 1 Provision for loan losses — (1 ) — (1 ) — — — — Balance at end of period $ 17 $ 7 $ 2 $ 26 $ 16 $ 8 $ 2 $ 26 Nine Months Ended Balance at beginning of period $ 16 $ 8 $ 2 $ 26 $ 17 $ 8 $ 1 $ 26 Charge-offs — — (1 ) (1 ) (2 ) (1 ) — (3 ) Recoveries — 2 — 2 1 1 1 3 Provision for loan losses 1 (3 ) 1 (1 ) — — — — Balance at end of period $ 17 $ 7 $ 2 $ 26 $ 16 $ 8 $ 2 $ 26 (1) All pledged asset lines (PALs) were fully collateralized by securities with fair values in excess of borrowings at September 30, 2018 and December 31, 2017 . A summary of impaired bank loan-related assets is as follows: September 30, 2018 December 31, 2017 Nonaccrual loans (1) $ 23 $ 28 Other real estate owned (2) 3 3 Total nonperforming assets 26 31 Troubled debt restructurings 4 11 Total impaired assets $ 30 $ 42 (1) Nonaccrual loans include nonaccrual troubled debt restructurings. (2) Included in other assets on the condensed consolidated balance sheets. Credit Quality In addition to monitoring delinquency, Schwab monitors the credit quality of First Mortgages and HELOCs by stratifying the portfolios by the following: • Year of origination; • Borrower FICO scores at origination (Origination FICO); • Updated borrower FICO scores (Updated FICO); • Loan-to-value (LTV) ratios at origination (Origination LTV); and • Estimated current LTV ratios (Estimated Current LTV). Borrowers’ FICO scores are provided by an independent third-party credit reporting service and updated quarterly. The Origination LTV and Estimated Current LTV for a HELOC include any first lien mortgage outstanding on the same property at the time of the HELOC’s origination. The Estimated Current LTV for each loan is updated on a monthly basis by reference to a home price appreciation index. The credit quality indicators of the Company’s bank loan portfolio are detailed below: September 30, 2018 Balance Weighted Average Utilization (1) Percent of First Mortgages Estimated Current LTV < 70% $ 9,383 777 N/A 0.05 % >70% – < 90% 868 771 N/A 0.24 % >90% – < 100% 4 713 N/A 8.70 % >100% 1 742 N/A — Total $ 10,256 776 N/A 0.07 % HELOCs Estimated Current LTV (2) < 70% $ 1,509 771 31 % 0.18 % >70% – < 90% 84 752 47 % 0.90 % >90% – < 100% 5 746 77 % 0.90 % >100% 4 704 81 % 5.28 % Total $ 1,602 770 31 % 0.24 % Pledged asset lines Weighted-Average LTV (2) =70% $ 4,556 766 36 % — December 31, 2017 Balance Weighted Average Utilization (1) Percent of First Mortgages Estimated Current LTV < 70% $ 9,046 775 N/A 0.09 % >70% – < 90% 961 769 N/A 0.46 % >90% – < 100% 5 714 N/A 10.49 % >100% 4 713 N/A 6.23 % Total $ 10,016 775 N/A 0.14 % HELOCs Estimated Current LTV (2) < 70% $ 1,773 772 32 % 0.18 % >70% – < 90% 148 755 47 % 0.84 % >90% – < 100% 14 742 64 % 2.85 % >100% 8 718 72 % 4.91 % Total $ 1,943 770 33 % 0.27 % Pledged asset lines Weighted-Average LTV (2) =70% $ 4,369 765 41 % — (1) The Utilization Rate is calculated using the outstanding balance divided by the associated total line of credit. (2) Represents the LTV for the full line of credit (drawn and undrawn). N/A Not applicable. September 30, 2018 First Mortgages HELOCs Year of origination Pre-2014 $ 2,144 $ 1,156 2014 436 93 2015 1,087 110 2016 2,662 96 2017 2,420 101 2018 1,507 46 Total $ 10,256 $ 1,602 Origination FICO <620 $ 5 — 620 – 679 83 8 680 – 739 1,595 305 > 740 8,573 1,289 Total $ 10,256 $ 1,602 Origination LTV < 70% $ 7,737 $ 1,127 >70% – < 90% 2,514 468 >90% – < 100% 5 7 Total $ 10,256 $ 1,602 December 31, 2017 First Mortgages HELOCs Year of origination Pre-2014 $ 2,804 $ 1,496 2014 530 116 2015 1,218 128 2016 2,886 111 2017 2,578 92 Total $ 10,016 $ 1,943 Origination FICO <620 $ 6 $ 1 620 – 679 89 10 680 – 739 1,569 365 > 740 8,352 1,567 Total $ 10,016 $ 1,943 Origination LTV < 70% $ 7,569 $ 1,360 >70% – < 90% 2,441 574 >90% – < 100% 6 9 Total $ 10,016 $ 1,943 At September 30, 2018 , First Mortgage loans of $9.3 billion had adjustable interest rates. These mortgages have initial fixed interest rates for three to ten years and interest rates that adjust annually thereafter. Approximately 31% of the balance of these mortgages consisted of loans with interest-only payment terms. The interest rates on approximately 64% of the balance of these interest-only loans are not scheduled to reset for three or more years. Schwab’s mortgage loans do not include interest terms described as temporary introductory rates below current market rates. The HELOC product has a 30 -year loan term with an initial draw period of ten years from the date of origination. After the initial draw period, the balance outstanding at such time is converted to a 20 -year amortizing loan. The interest rate during the initial draw period, and the 20 -year amortizing period, is a floating rate based on the prime rate plus a margin. HELOCs that convert to an amortizing loan may experience higher delinquencies, and higher loss rates, than those in the initial draw period. The allowance for loan loss methodology takes this increased inherent risk into consideration. The following table presents when current outstanding HELOCs will convert to amortizing loans: September 30, 2018 Balance Converted to an amortizing loan by period end $ 640 Within 1 year 186 > 1 year – 3 years 133 > 3 years – 5 years 163 > 5 years 480 Total $ 1,602 At September 30, 2018 , $1.3 billion of the HELOC portfolio was secured by second liens on the associated properties. Second lien mortgage loans typically possess a higher degree of credit risk given the subordination to the first lien holder in the event of default. In addition to the credit monitoring activities described previously, Schwab also monitors credit risk by reviewing the delinquency status of the first lien loan on the associated property. At September 30, 2018 , the borrowers on approximately 54% of HELOC loan balances outstanding only paid the minimum amount due.

Variable Interest Entities

Variable Interest Entities	9 Months Ended
	Sep. 30, 2018
Variable Interest Entities [Abstract]
Variable Interest Entities	Variable Interest Entities As of September 30, 2018 and December 31, 2017 , all of Schwab’s involvement with variable interest entities (VIEs) is through CSB’s Community Reinvestment Act-related investments and most of those are related to Low-Income Housing Tax Credit (LIHTC) investments. As part of CSB’s community reinvestment initiatives, CSB generally invests with other institutional investors in funds that make equity investments in multifamily affordable housing properties. CSB receives tax credits and other tax benefits for these investments. CSB’s LIHTC investments are accounted for using the proportional amortization method, which amortizes the cost of the investment over the period in which the investor expects to receive tax credits and other tax benefits, and the resulting amortization is included in taxes on income on the consolidated statements of income. Aggregate assets, liabilities, and maximum exposure to loss The aggregate assets, liabilities, and maximum exposure to loss from those VIEs in which Schwab holds a variable interest, but is not the primary beneficiary, are summarized in the table below: September 30, 2018 December 31, 2017 Aggregate Aggregate Maximum Aggregate Aggregate Maximum LIHTC investments (1) $ 347 $ 204 $ 347 $ 304 $ 203 $ 304 Other CRA investments (2) 68 — 116 69 — 125 Total $ 415 $ 204 $ 463 $ 373 $ 203 $ 429 (1) Aggregate assets and aggregate liabilities are included in other assets and accrued expenses and other liabilities, respectively, on the condensed consolidated balance sheets. (2) Other CRA investments are recorded using either the adjusted cost method, equity method, or as HTM securities. Aggregate assets are included in HTM securities, bank loans – net, or other assets on the condensed consolidated balance sheets. Schwab’s maximum exposure to loss would result from the loss of the investments, including any committed amounts. During the nine months ended September 30, 2018 and 2017 , Schwab did not provide or intend to provide financial or other support to the VIEs that it was not contractually required to provide. CSB’s funding of these remaining commitments is dependent upon the occurrence of certain conditions, and CSB expects to pay substantially all of these commitments between 2018 and 2021 .

Bank Deposits

Bank Deposits	9 Months Ended
	Sep. 30, 2018
Banking and Thrift [Abstract]
Bank Deposits	Bank Deposits Bank deposits consist of interest-bearing and non-interest-bearing deposits as follows: September 30, 2018 December 31, 2017 Interest-bearing deposits: Deposits swept from brokerage accounts $ 194,337 $ 148,212 Checking 12,230 13,388 Savings and other 6,153 7,264 Total interest-bearing deposits 212,720 168,864 Non-interest-bearing deposits 688 792 Total bank deposits $ 213,408 $ 169,656

Borrowings

Borrowings	9 Months Ended
	Sep. 30, 2018
Debt Disclosure [Abstract]
Borrowings	Borrowings CSC’s Senior Notes are unsecured obligations and rank equally with the other unsecured senior debt. CSC may redeem some or all of the Senior Notes of each series prior to their maturity, subject to certain restrictions, and the payment of an applicable make-whole premium in certain instances. Interest is payable semi-annually for the fixed-rate Senior Notes and quarterly for the floating-rate Senior Notes. The following table lists long-term debt by instrument outstanding as of September 30, 2018 and December 31, 2017 . Date of Principal Amount Outstanding Issuance September 30, 2018 December 31, 2017 Fixed-rate Senior Notes: 1.500% due March 10, 2018 (1) 03/10/15 $ — $ 625 2.200% due July 25, 2018 (2) 07/25/13 — 275 4.450% due July 22, 2020 07/22/10 700 700 3.250% due May 21, 2021 05/22/18 600 — 3.225% due September 1, 2022 08/29/12 256 256 2.650% due January 25, 2023 12/07/17 800 800 3.000% due March 10, 2025 03/10/15 375 375 3.850% due May 21, 2025 05/22/18 750 — 3.450% due February 13, 2026 11/13/15 350 350 3.200% due March 2, 2027 03/02/17 650 650 3.200% due January 25, 2028 12/07/17 700 700 Floating-rate Senior Notes: Three-month LIBOR + 0.32% due May 21, 2021 05/22/18 600 — Total Senior Notes 5,781 4,731 5.450% Finance lease obligation (3) 06/04/04 55 61 Unamortized discount — net (13 ) (14 ) Debt issuance costs (33 ) (25 ) Total long-term debt $ 5,790 $ 4,753 (1) Redeemed on February 8, 2018. (2) Redeemed on June 25, 2018. (3) Schwab has a finance lease obligation related to an office building and land under a 20 -year lease. The remaining finance lease obligation is being reduced by a portion of the lease payments over the remaining lease term through June 30, 2024. Annual maturities on long-term debt outstanding at September 30, 2018 are as follows: Maturities 2018 $ 2 2019 8 2020 709 2021 1,209 2022 266 Thereafter 3,642 Total maturities 5,836 Unamortized discount — net (13 ) Debt issuance costs (33 ) Total long-term debt $ 5,790 Short-term borrowings: Certain banking subsidiaries maintain secured credit facilities with the FHLB. Amounts available under these facilities are dependent on the value of our First Mortgages, HELOCs, and the fair value of certain of their investment securities that are pledged as collateral. As of September 30, 2018 , the collateral pledged provided a total borrowing capacity of $30.0 billion of which no amounts were outstanding. As of December 31, 2017 , the collateral pledged by CSB provided a total borrowing capacity of $32.3 billion , of which $15.0 billion was outstanding. As a condition of the FHLB borrowings, we are required to hold FHLB stock, which was recorded in other assets on the condensed consolidated balance sheets. The investment in FHLB was $32 million at September 30, 2018 and $405 million at December 31, 2017 .

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Loan Portfolio: CSB provides a co-branded loan origination program for CSB clients (the Program) with Quicken Loans, Inc. (Quicken Loans ® ). Pursuant to the Program, Quicken Loans originates and services First Mortgages and HELOCs for CSB clients. Under the Program, CSB purchases certain First Mortgages and HELOCs that are originated by Quicken Loans. CSB purchased First Mortgages of $491 million and $696 million during the third quarters of 2018 and 2017 , respectively, and $1.6 billion and $2.0 billion during the first nine months of 2018 and 2017 , respectively. Schwab purchased HELOCs with commitments of $104 million and $115 million during the third quarters of 2018 and 2017 , respectively, and $311 million and $344 million during the first nine months of 2018 and 2017 , respectively. The Company’s commitments to extend credit on bank lines of credit and to purchase First Mortgages are as follows: September 30, 2018 December 31, 2017 Commitments to extend credit related to unused HELOCs, PALs, and other lines of credit $ 11,028 $ 10,060 Commitments to purchase First Mortgage loans 355 308 Total $ 11,383 $ 10,368 Guarantees and indemnifications: Schwab has clients that sell (i.e., write) listed option contracts that are cleared by the Options Clearing Corporation – a clearing house that establishes margin requirements on these transactions. We partially satisfy the margin requirements by arranging unsecured standby letter of credit agreements (LOCs), in favor of the Options Clearing Corporation, which are issued by several banks. At September 30, 2018 , the aggregate face amount of these LOCs totaled $225 million . There were no funds drawn under any of these LOCs at September 30, 2018 . In connection with its securities lending activities, Schwab is required to provide collateral to certain brokerage clients. The Company satisfies the collateral requirements by providing cash as collateral. Schwab also provides guarantees to securities clearing houses and exchanges under standard membership agreements, which require members to guarantee the performance of other members. Under the agreements, if another member becomes unable to satisfy its obligations to the clearing houses and exchanges, other members would be required to meet shortfalls. Schwab’s liability under these arrangements is not quantifiable and may exceed the cash and securities it has posted as collateral. The potential requirement for the Company to make payments under these arrangements is remote. Accordingly, no liability has been recognized for these guarantees. Legal contingencies: Schwab is subject to claims and lawsuits in the ordinary course of business, including arbitrations, class actions and other litigation, some of which include claims for substantial or unspecified damages. The Company is also the subject of inquiries, investigations, and proceedings by regulatory and other governmental agencies. Predicting the outcome of a litigation or regulatory matter is inherently difficult, requiring significant judgment and evaluation of various factors, including the procedural status of the matter and any recent developments; prior experience and the experience of others in similar cases; available defenses, including potential opportunities to dispose of a case on the merits or procedural grounds before trial (e.g., motions to dismiss or for summary judgment); the progress of fact discovery; the opinions of counsel and experts regarding potential damages; potential opportunities for settlement and the status of any settlement discussions; and potential insurance coverage and indemnification. It may not be reasonably possible to estimate a range of potential liability until the matter is closer to resolution – pending, for example, further proceedings, the outcome of key motions or appeals, or discussions among the parties. Numerous issues may have to be developed, such as discovery of important factual matters and determination of threshold legal issues, which may include novel or unsettled questions of law. Reserves are established or adjusted or further disclosure and estimates of potential loss are provided as the matter progresses and more information becomes available. Schwab believes it has strong defenses in all significant matters currently pending and is contesting liability and any damages claimed. Nevertheless, some of these matters may result in adverse judgments or awards, including penalties, injunctions or other relief, and the Company may also determine to settle a matter because of the uncertainty and risks of litigation. Described below are certain matters in which there is a reasonable possibility that a material loss could be incurred or where the matter may otherwise be of significant interest to stockholders. Unless otherwise noted, the Company is unable to provide a reasonable estimate of any potential liability given the stage of proceedings in the matter. With respect to all other pending matters, based on current information and consultation with counsel, it does not appear reasonably possible that the outcome of any such matter would be material to the financial condition, operating results, or cash flows of the Company. Total Bond Market Fund Litigation : On August 28, 2008, a class action lawsuit was filed in the U.S. District Court for the Northern District of California on behalf of investors in the Schwab Total Bond Market Fund ™ . Plaintiff’s fourth amended complaint, filed on June 25, 2015, asserts state law breach of contract and fiduciary duty claims and names CSIM, Schwab Investments (registrant and issuer of the fund’s shares), and certain current and former fund trustees as defendants. Allegations include that the fund improperly deviated from its stated investment objectives by investing in collateralized mortgage obligations (CMOs) and investing more than 25% of fund assets in CMOs and mortgage-backed securities without obtaining a fundholder vote. Plaintiff seeks unspecified compensatory and rescission damages, unspecified equitable and injunctive relief, costs, and attorneys’ fees on behalf of a putative class of investors who held shares as of August 31, 2007, and a putative class of investors who purchased the shares between September 1, 2017 and February 27, 2009. In decisions issued October 6, 2015 and February 23, 2016, the court dismissed all claims with prejudice, holding that federal securities law precluded plaintiff from pursuing such claims as a class action. Plaintiff appealed to the Ninth Circuit, and on September 14, 2018, a 3-judge panel upheld dismissal, with leave for plaintiff to pursue the claims in its individual capacity. Action by plaintiff, including further appeal, remains pending. Crago Order Routing Litigation : On July 13, 2016, a securities class action lawsuit was filed in the U.S. District Court for the Northern District of California on behalf of a putative class of customers executing equity orders through CS&Co. The lawsuit names CS&Co and CSC as defendants and alleges that an agreement under which CS&Co routed orders to UBS Securities LLC between July 13, 2011 and December 31, 2014 violated CS&Co’s duty to seek best execution. Plaintiffs seek unspecified damages, interest, injunctive and equitable relief, and attorneys’ fees and costs. After a first amended complaint was dismissed with leave to amend, plaintiffs filed a second amended complaint on August 14, 2017. Defendants again moved to dismiss, and in a decision issued December 5, 2017, the court denied the motion. Defendants have answered the complaint to deny all allegations, and intend to vigorously contest the lawsuit.

Financial Instruments Subject t

Financial Instruments Subject to Off-Balance Sheet Credit Risk	9 Months Ended
	Sep. 30, 2018
Offsetting [Abstract]
Financial Instruments Subject to Off-Balance Sheet Credit Risk	Financial Instruments Subject to Off-Balance Sheet Credit Risk Resale agreements: Schwab enters into collateralized resale agreements principally with other broker-dealers, which could result in losses in the event the counterparty fails to purchase the securities held as collateral for the cash advanced and the fair value of the securities declines. To mitigate this risk, Schwab requires that the counterparty deliver securities to a custodian, to be held as collateral, with a fair value at or in excess of the resale price. Schwab also sets standards for the credit quality of the counterparty, monitors the fair value of the underlying securities as compared to the related receivable, including accrued interest, and requires additional collateral where deemed appropriate. The collateral provided under these resale agreements is utilized to meet obligations under broker-dealer client protection rules, which place limitations on our ability to access such segregated securities. For Schwab to repledge or sell this collateral, it would be required to deposit cash and/or securities of an equal amount into its segregated reserve bank accounts in order to meet its segregated cash and investment requirement. Schwab’s resale agreements are not subject to master netting arrangements. Securities lending: Schwab loans brokerage client securities temporarily to other brokers and clearing houses in connection with its securities lending activities and receives cash as collateral for the securities loaned. Increases in security prices may cause the fair value of the securities loaned to exceed the amount of cash received as collateral. In the event the counterparty to these transactions does not return the loaned securities or provide additional cash collateral, we may be exposed to the risk of acquiring the securities at prevailing market prices in order to satisfy our client obligations. Schwab mitigates this risk by requiring credit approvals for counterparties, monitoring the fair value of securities loaned, and requiring additional cash as collateral when necessary. We also borrow securities from other broker-dealers to fulfill short sales by brokerage clients and deliver cash to the lender in exchange for the securities. The fair value of these borrowed securities was $338 million and $215 million at September 30, 2018 and December 31, 2017 , respectively. All of our securities lending transactions are through a program with a clearing organization, which guarantees the return of cash to us and is subject to enforceable master netting arrangements with other broker-dealers; however, we do not net securities lending transactions. Therefore, the securities loaned and securities borrowed are presented gross in the condensed consolidated balance sheets. The following table presents information about our resale agreements and securities lending activity depicting the potential effect of rights of setoff between these recognized assets and recognized liabilities at September 30, 2018 and December 31, 2017 . Gross Amounts Not Offset in the Gross Gross Amounts Net Amounts Counterparty Collateral Net September 30, 2018 Assets Resale agreements (1) $ 4,424 $ — $ 4,424 $ — $ (4,424 ) (2) $ — Securities borrowed (3) 346 — 346 (316 ) (30 ) — Total $ 4,770 $ — $ 4,770 $ (316 ) $ (4,454 ) $ — Liabilities Securities loaned (4,5) $ 1,062 $ — $ 1,062 $ (316 ) $ (652 ) $ 94 Total $ 1,062 $ — $ 1,062 $ (316 ) $ (652 ) $ 94 December 31, 2017 Assets Resale agreements (1) $ 6,596 $ — $ 6,596 $ — $ (6,596 ) (2) $ — Securities borrowed (3) 222 — 222 (199 ) (22 ) 1 Total $ 6,818 $ — $ 6,818 $ (199 ) $ (6,618 ) $ 1 Liabilities Securities loaned (4,5) $ 966 $ — $ 966 $ (199 ) $ (670 ) $ 97 Total $ 966 $ — $ 966 $ (199 ) $ (670 ) $ 97 (1) Included in cash and investments segregated and on deposit for regulatory purposes in the condensed consolidated balance sheets. (2) Actual collateral was greater than or equal to 102% of the related assets. At September 30, 2018 and December 31, 2017 , the fair value of collateral received in connection with resale agreements that are available to be repledged or sold was $4.5 billion and $6.7 billion , respectively. (3) Included in receivables from brokers, dealers, and clearing organizations in the condensed consolidated balance sheets. (4) Included in payables to brokers, dealers, and clearing organizations in the condensed consolidated balance sheets. The cash collateral received from counterparties under securities lending transactions was equal to or greater than the market value of the securities loaned at September 30, 2018 and December 31, 2017 . (5) Securities loaned are predominantly comprised of equity securities held in client brokerage accounts with overnight and continuous remaining contractual maturities. Margin lending: Clients with margin loans have agreed to allow Schwab to pledge collateralized securities in their brokerage accounts in accordance with federal regulations. The following table summarizes the fair value of client securities that were available, under such regulations, that could have been used as collateral, and the amounts that we had pledged: September 30, 2018 December 31, 2017 Fair value of client securities available to be pledged $ 28,806 $ 25,905 Fair value of client securities pledged for: Fulfillment of requirements with the Options Clearing Corporation (1) 3,036 2,280 Fulfillment of client short sales 1,923 2,011 Securities lending to other broker-dealers 872 784 Total collateral pledged $ 5,831 $ 5,075 Note: Excludes amounts available and pledged for securities lending from fully-paid client securities. The fair value of fully-paid client securities available and pledged was $88 million as of September 30, 2018 and $78 million as of December 31, 2017 . (1) Client securities pledged to fulfill client margin requirements for open option contracts established with the Options Clearing Corporation.

Fair Values of Assets and Liabi

Fair Values of Assets and Liabilities	9 Months Ended
	Sep. 30, 2018
Fair Value Disclosures [Abstract]
Fair Values of Assets and Liabilities	Fair Values of Assets and Liabilities Assets and liabilities measured at fair value on a recurring basis Schwab’s assets and liabilities measured at fair value on a recurring basis include certain cash equivalents, certain investments segregated and on deposit for regulatory purposes, other securities owned, and AFS securities. The Company uses the market approach to determine the fair value of assets and liabilities. When available, the Company uses quoted prices in active markets to measure the fair value of assets and liabilities. When utilizing market data and bid-ask spread, the Company uses the price within the bid-ask spread that best represents fair value. When quoted prices do not exist, the Company uses prices obtained from independent third-party pricing services to measure the fair value of investment assets. We generally obtain prices from at least three independent pricing sources for assets recorded at fair value. Our primary independent pricing service provides prices based on observable trades and discounted cash flows that incorporate observable information such as yields for similar types of securities (a benchmark interest rate plus observable spreads) and weighted-average maturity for the same or similar “to-be-issued” securities. We compare the prices obtained from the primary independent pricing service to the prices obtained from the additional independent pricing sources to determine if the price obtained from the primary independent pricing service is reasonable. Schwab does not adjust the prices received from independent third-party pricing services unless such prices are inconsistent with the definition of fair value and result in a material difference in the recorded amounts. For a description of the fair value hierarchy and Schwab’s fair value methodologies, including the use of independent third-party pricing services, see Note 2 in the 2017 Form 10-K. We did not transfer any assets or liabilities between Level 1, Level 2, or Level 3 during the nine months ended September 30, 2018 , or the year ended December 31, 2017 . In addition, the Company did not adjust prices received from the primary independent third-party pricing service at September 30, 2018 or December 31, 2017 . Assets and Liabilities Measured at Fair Value on a Recurring Basis The following tables present the fair value hierarchy for assets measured at fair value on a recurring basis. Liabilities recorded at fair value were not material, and therefore are not included in the following tables: September 30, 2018 Level 1 Level 2 Level 3 Balance at Cash equivalents: Money market funds $ 552 $ — $ — $ 552 Commercial paper — 1,988 — 1,988 Total cash equivalents 552 1,988 — 2,540 Investments segregated and on deposit for regulatory purposes: Certificates of deposit — 1,950 — 1,950 Total investments segregated and on deposit for regulatory purposes — 1,950 — 1,950 Other securities owned: Equity and bond mutual funds 394 — — 394 Schwab Funds ® money market funds 21 — — 21 State and municipal debt obligations — 44 — 44 Equity, U.S. Government and corporate debt, and other securities 3 38 — 41 Total other securities owned 418 82 — 500 Available for sale securities: U.S. agency mortgage-backed securities — 23,955 — 23,955 U.S. Treasury securities — 12,243 — 12,243 Asset-backed securities — 9,387 — 9,387 Corporate debt securities — 6,922 — 6,922 Certificates of deposit — 2,769 — 2,769 U.S. agency notes — 1,682 — 1,682 Commercial paper — 518 — 518 Foreign government agency securities — 48 — 48 Non-agency commercial mortgage-backed securities — 34 — 34 Total available for sale securities — 57,558 — 57,558 Total $ 970 $ 61,578 $ — $ 62,548 December 31, 2017 Level 1 Level 2 Level 3 Balance at Cash equivalents: Money market funds $ 2,727 $ — $ — $ 2,727 Total cash equivalents 2,727 — — 2,727 Investments segregated and on deposit for regulatory purposes: Certificates of deposit — 2,198 — 2,198 U.S. Government securities — 3,658 — 3,658 Total investments segregated and on deposit for regulatory purposes — 5,856 — 5,856 Other securities owned: Equity and bond mutual funds 318 — — 318 Schwab Funds ® money market funds 135 — — 135 State and municipal debt obligations — 52 — 52 Equity, U.S. Government and corporate debt, and other securities 2 32 — 34 Total other securities owned 455 84 — 539 Available for sale securities: U.S. agency mortgage-backed securities — 20,929 — 20,929 U.S. Treasury securities — 9,500 — 9,500 Asset-backed securities — 9,047 — 9,047 Corporate debt securities — 6,169 — 6,169 Certificates of deposit — 2,041 — 2,041 U.S. agency notes — 1,906 — 1,906 Commercial paper — 313 — 313 Foreign government agency securities — 50 — 50 Non-agency commercial mortgage-backed securities — 40 — 40 Total available for sale securities — 49,995 — 49,995 Total $ 3,182 $ 55,935 $ — $ 59,117 Fair Value of Other Financial Instruments The following tables present the fair value hierarchy for other financial instruments: September 30, 2018 Carrying Level 1 Level 2 Level 3 Balance at Assets Cash and cash equivalents $ 19,290 $ — $ 19,290 $ — $ 19,290 Cash and investments segregated and on deposit for 6,526 — 6,526 — 6,526 Receivables from brokers, dealers, and clearing 798 — 798 — 798 Receivables from brokerage clients — net 22,402 — 22,402 — 22,402 Held to maturity securities: U.S. agency mortgage-backed securities 113,453 — 109,996 — 109,996 Asset-backed securities 17,964 — 18,074 — 18,074 Corporate debt securities 4,578 — 4,531 — 4,531 U.S. state and municipal securities 1,330 — 1,329 — 1,329 Non-agency commercial mortgage-backed securities 1,149 — 1,125 — 1,125 U.S. Treasury securities 223 — 212 — 212 Certificates of deposit 200 — 201 — 201 Foreign government agency securities 50 — 48 — 48 Other 5 — 5 — 5 Total held to maturity securities 138,952 — 135,521 — 135,521 Bank loans — net: First Mortgages 10,239 — 9,963 — 9,963 HELOCs 1,595 — 1,664 — 1,664 Pledged asset lines 4,556 — 4,556 — 4,556 Other 174 — 174 — 174 Total bank loans — net 16,564 — 16,357 — 16,357 Other assets 463 — 463 — 463 Total $ 204,995 $ — $ 201,357 $ — $ 201,357 Liabilities Bank deposits $ 213,408 $ — $ 213,408 $ — $ 213,408 Payables to brokers, dealers, and clearing organizations 1,522 — 1,522 — 1,522 Payables to brokerage clients 27,851 — 27,851 — 27,851 Accrued expenses and other liabilities 1,177 — 1,177 — 1,177 Long-term debt 5,790 — 5,687 — 5,687 Total $ 249,748 $ — $ 249,645 $ — $ 249,645 December 31, 2017 Carrying Level 1 Level 2 Level 3 Balance at Assets Cash and cash equivalents $ 11,490 $ — $ 11,490 $ — $ 11,490 Cash and investments segregated and on deposit for 9,277 — 9,277 — 9,277 Receivables from brokers, dealers, and clearing 649 — 649 — 649 Receivables from brokerage clients — net 20,568 — 20,568 — 20,568 Held to maturity securities: U.S. agency mortgage-backed securities 101,197 — 100,453 — 100,453 Asset-backed securities 12,937 — 13,062 — 13,062 Corporate debt securities 4,078 — 4,086 — 4,086 U.S. state and municipal securities 1,247 — 1,304 — 1,304 Non-agency commercial mortgage-backed securities 994 — 999 — 999 U.S. Treasury securities 223 — 220 — 220 Certificates of deposit 200 — 200 — 200 Foreign government agency securities 50 — 49 — 49 Total held to maturity securities 120,926 — 120,373 — 120,373 Bank loans — net: First Mortgages 10,000 — 9,917 — 9,917 HELOCs 1,935 — 2,025 — 2,025 Pledged asset lines 4,369 — 4,369 — 4,369 Other 174 — 174 — 174 Total bank loans — net 16,478 — 16,485 — 16,485 Other assets 781 — 781 — 781 Total $ 180,169 $ — $ 179,623 $ — $ 179,623 Liabilities Bank deposits $ 169,656 $ — $ 169,656 $ — $ 169,656 Payables to brokers, dealers, and clearing organizations 1,287 — 1,287 — 1,287 Payables to brokerage clients 31,243 — 31,243 — 31,243 Accrued expenses and other liabilities 1,463 — 1,463 — 1,463 Short-term borrowings 15,000 — 15,000 — 15,000 Long-term debt 4,753 — 4,811 — 4,811 Total $ 223,402 $ — $ 223,460 $ — $ 223,460

Stockholders' Equity

Stockholders' Equity	9 Months Ended
	Sep. 30, 2018
Equity [Abstract]
Stockholders' Equity	Stockholders’ Equity The Company’s preferred stock issued and outstanding is as follows: Liquidation Preference Per Share Dividend Rate in Effect at September 30, 2018 Earliest Redemption Date Date at Which Dividend Rate Becomes Floating Floating Annual Rate of Three-Month LIBOR plus: Shares Issued and Outstanding (In thousands) at Carrying Value at September 30, 2018 (1) December 31, 2017 (1) September 30, 2018 December 31, 2017 Issue Date Fixed-rate: Series C 600 600 $ 1,000 $ 585 $ 585 08/03/15 6.000 % 12/01/20 N/A N/A Series D 750 750 1,000 728 728 03/07/16 5.950 % 06/01/21 N/A N/A Fixed-to-floating-rate: Series A 400 400 1,000 397 397 01/26/12 7.000 % 02/01/22 02/01/22 4.820 % Series E 6 6 100,000 591 591 10/31/16 4.625 % 03/01/22 03/01/22 3.315 % Series F 5 5 100,000 492 492 10/31/17 5.000 % 12/01/27 12/01/27 2.575 % Total preferred stock 1,761 1,761 $ 2,793 $ 2,793 (1) Represented by depositary shares, except for Series A. N/A Not applicable.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	9 Months Ended
	Sep. 30, 2018
Equity [Abstract]
Accumulated Other Comprehensive Income	Accumulated Other Comprehensive Income Accumulated other comprehensive income (AOCI) represents cumulative gains and losses that are not reflected in earnings. The components of other comprehensive income (loss) are as follows: 2018 2017 Three Months Ended September 30, Before Tax Net of Before Tax Net of Change in net unrealized gain (loss) on available for sale securities: Net unrealized gain (loss) $ (43 ) $ 11 $ (32 ) $ — $ — $ — Change in net unrealized gain (loss) on held to maturity securities: Amortization of amounts previously recorded upon transfer from available for sale 8 (2 ) 6 10 (4 ) 6 Other comprehensive income (loss) $ (35 ) $ 9 $ (26 ) $ 10 $ (4 ) $ 6 2018 2017 Nine Months Ended September 30, Before Tax Net of Before Tax Net of Change in net unrealized gain (loss) on available for sale securities: Net unrealized gain (loss) $ (184 ) $ 45 $ (139 ) $ 81 $ (30 ) $ 51 Reclassification of net unrealized loss on securities transferred to held to maturity (1) — — — 227 (85 ) 142 Other reclassifications included in other revenue — — — (7 ) 3 (4 ) Change in net unrealized gain (loss) on held to maturity securities: Reclassification of net unrealized loss on securities transferred from available for sale (1) — — — (227 ) 85 (142 ) Amortization of amounts previously recorded upon transfer from available for sale 26 (6 ) 20 21 (9 ) 12 Other — — — (3 ) 1 (2 ) Other comprehensive income (loss) $ (158 ) $ 39 $ (119 ) $ 92 $ (35 ) $ 57 (1) See Note 5 in the 2017 10-K for discussion of the transfer of securities from the AFS category to the HTM category during the first quarter of 2017. AOCI balances are as follows: Total Accumulated Other Comprehensive Income Balance at December 31, 2016 $ (163 ) Available for sale securities: Net unrealized gain (loss) 51 Reclassification of net unrealized loss on securities transferred to held to maturity 142 Other reclassifications included in other revenue (4 ) Held to maturity securities: Reclassification of net unrealized loss on securities transferred from available for sale (142 ) Amortization of amounts previously recorded upon transfer to held to maturity from available for sale 12 Other (2 ) Balance at September 30, 2017 $ (106 ) Balance at December 31, 2017 $ (152 ) Adoption of accounting standards (Note 2) (33 ) Available for sale securities: Net unrealized gain (loss) (139 ) Held to maturity securities: Amortization of amounts previously recorded upon transfer to held to maturity from available for sale 20 Balance at September 30, 2018 $ (304 )

Taxes on Income

Taxes on Income	9 Months Ended
	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Taxes on Income	Taxes on Income On December 22, 2017, the Tax Act was signed into law. Among other things, the Tax Act lowered the federal corporate income tax rate from 35% to 21%, effective for tax years including or commencing January 1, 2018. Schwab’s effective tax rate for the three and nine months ended September 30, 2018 was 24.3% and 23.3% , respectively, compared to 34.6% and 34.9% for the three and nine months ended September 30, 2017 , respectively, resulting from the impact of the Tax Act of 2017. Also as a result of the Tax Act, Schwab recognized a $46 million one-time non-cash charge to taxes on income in the fourth quarter of 2017 associated with the remeasurement of net deferred tax assets and other tax adjustments related to the Tax Act. While we were able to make a reasonable estimate of the impact of the reduction in the corporate tax rate in the fourth quarter of 2017, our accounting for various elements of the Tax Act may be affected by clarifications of the Tax Act and other related analysis. During the second quarter of 2018, Schwab concluded its analysis of the effect of bonus depreciation that allows for immediate expensing of qualified property related to the Tax Act. The impact of the true-up adjustment from this analysis was determined to be immaterial. We are continuing to gather additional information to complete the accounting for the remaining estimated items, including the state tax effect of adjustments made to federal temporary differences, and expect to complete the accounting within the prescribed measurement period. As such, the impact of the Tax Act is an estimate pending further information and the analysis noted. As of January 1, 2018, Schwab adopted new accounting guidance that decreased AOCI and increased retained earnings by $33 million for the reclassification of certain impacts of the Tax Act as described in Note 2.

Earnings Per Common Share

Earnings Per Common Share	9 Months Ended
	Sep. 30, 2018
Earnings Per Share [Abstract]
Earnings Per Common Share	Earnings Per Common Share EPS under the basic and diluted computations is as follows: Three Months Ended Nine Months Ended 2018 2017 2018 2017 Net income $ 923 $ 618 $ 2,572 $ 1,757 Preferred stock dividends and other (1) (38 ) (43 ) (128 ) (127 ) Net income available to common stockholders $ 885 $ 575 $ 2,444 $ 1,630 Weighted-average common shares outstanding — basic 1,351 1,339 1,349 1,338 Common stock equivalent shares related to stock incentive plans 13 14 14 14 Weighted-average common shares outstanding — diluted (2) 1,364 1,353 1,363 1,352 Basic EPS $ .66 $ .43 $ 1.81 $ 1.22 Diluted EPS $ .65 $ .42 $ 1.79 $ 1.21 (1) Includes preferred stock dividends and undistributed earnings and dividends allocated to non-vested restricted stock units. (2) Antidilutive stock options and restricted stock units excluded from the calculation of diluted EPS totaled 11 million and 9 million shares for the third quarters of 2018 and 2017 , respectively, and 12 million and 10 million shares for the first nine months of 2018 and 2017 , respectively.

Regulatory Requirements

Regulatory Requirements	9 Months Ended
	Sep. 30, 2018
Banking and Thrift [Abstract]
Regulatory Requirements	Regulatory Requirements At September 30, 2018 , Schwab and CSB met all of their respective capital requirements. The regulatory capital and ratios for CSC (consolidated) and CSB are as follows: Actual Minimum to be Minimum Capital Requirement September 30, 2018 Amount Ratio Amount Ratio Amount Ratio CSC Common Equity Tier 1 Risk-Based Capital $ 17,025 19.6 % N/A $ 3,907 4.5 % Tier 1 Risk-Based Capital 19,818 22.8 % N/A 5,210 6.0 % Total Risk-Based Capital 19,846 22.9 % N/A 6,946 8.0 % Tier 1 Leverage 19,818 7.5 % N/A 10,622 4.0 % CSB Common Equity Tier 1 Risk-Based Capital $ 15,164 20.2 % $ 4,890 6.5 % $ 3,385 4.5 % Tier 1 Risk-Based Capital 15,164 20.2 % 6,018 8.0 % 4,513 6.0 % Total Risk-Based Capital 15,191 20.2 % 7,522 10.0 % 6,018 8.0 % Tier 1 Leverage 15,164 7.1 % 10,668 5.0 % 8,534 4.0 % December 31, 2017 CSC Common Equity Tier 1 Risk-Based Capital $ 14,630 19.3 % N/A $ 3,414 4.5 % Tier 1 Risk-Based Capital 17,423 23.0 % N/A 4,552 6.0 % Total Risk-Based Capital 17,452 23.0 % N/A 6,069 8.0 % Tier 1 Leverage 17,423 7.6 % N/A 9,218 4.0 % CSB Common Equity Tier 1 Risk-Based Capital $ 13,355 20.1 % $ 4,324 6.5 % $ 2,993 4.5 % Tier 1 Risk-Based Capital 13,355 20.1 % 5,321 8.0 % 3,991 6.0 % Total Risk-Based Capital 13,382 20.1 % 6,652 10.0 % 5,321 8.0 % Tier 1 Leverage 13,355 7.1 % 9,462 5.0 % 7,569 4.0 % N/A Not applicable. At September 30, 2018 , CSB is considered well capitalized (the highest category) under its regulatory capital rules. At September 30, 2018 , CSC’s and CSB’s capital levels exceeded the fully implemented capital conservation buffer requirement. Certain events, such as growth in bank deposits and regulatory discretion, could adversely affect our ability to meet future capital requirements. In late 2017, Schwab acquired a federal savings bank charter and changed the name to Charles Schwab Signature Bank (CSSB). At September 30, 2018 , CSSB’s balance sheet consisted primarily of investment securities with total assets of $13.1 billion . CSSB is subject to similar regulatory guidelines and requirements, and seeks to maintain a Tier 1 Leverage Ratio similar to CSB. Net capital and net capital requirements for CS&Co are as follows: September 30, 2018 December 31, 2017 Net Capital $ 2,280 $ 2,118 Minimum net capital required 0.250 0.250 2% of aggregate debit balances 476 435 Net Capital in excess of required net capital $ 1,804 $ 1,683 In accordance with the SEC Customer Protection Rule, CS&Co had portions of its cash and investments segregated for the exclusive benefit of clients at September 30, 2018 . The SEC Customer Protection Rule requires broker-dealers to segregate client fully paid securities and cash balances not collateralizing margin positions and not swept to money market funds or bank deposit accounts. Amounts included in cash and investments segregated and on deposit for regulatory purposes represent actual balances on deposit. Cash and cash equivalents included in cash and investments segregated and on deposit for regulatory purposes are presented as part of Schwab’s cash balances in the consolidated statements of cash flows.

Segment Information

Segment Information	9 Months Ended
	Sep. 30, 2018
Segment Reporting [Abstract]
Segment Information	Segment Information Schwab’s two reportable segments are Investor Services and Advisor Services. Schwab structures the operating segments according to its clients and the services provided to those clients. The Investor Services segment provides retail brokerage and banking services to individual investors and retirement plan services, as well as other corporate brokerage services, to businesses and their employees. The Advisor Services segment provides custodial, trading, banking, and support services, as well as retirement business services to independent RIAs, independent retirement advisors, and recordkeepers. Revenues and expenses are allocated to the two segments based on which segment services the client. Management evaluates the performance of the segments on a pre-tax basis. Segment assets and liabilities are not used for evaluating segment performance or in deciding how to allocate resources to segments. There are no revenues from transactions between the segments. Financial information for the segments is presented in the following tables: Investor Services Advisor Services Total Three Months Ended September 30, 2018 2017 2018 2017 2018 2017 Net Revenues Net interest revenue $ 1,138 $ 818 $ 389 $ 264 $ 1,527 $ 1,082 Asset management and administration fees 565 595 244 266 809 861 Trading revenue 112 94 64 57 176 151 Other 53 54 14 17 67 71 Total net revenues 1,868 1,561 711 604 2,579 2,165 Expenses Excluding Interest 1,015 918 345 302 1,360 1,220 Income before taxes on income $ 853 $ 643 $ 366 $ 302 $ 1,219 $ 945 Investor Services Advisor Services Total Nine Months Ended September 30, 2018 2017 2018 2017 2018 2017 Net Revenues Net interest revenue $ 3,158 $ 2,366 $ 1,039 $ 769 $ 4,197 $ 3,135 Asset management and administration fees 1,727 1,743 747 786 2,474 2,529 Trading revenue 354 311 203 189 557 500 Other 182 159 53 53 235 212 Total net revenues 5,421 4,579 2,042 1,797 7,463 6,376 Expenses Excluding Interest 3,069 2,762 1,042 917 4,111 3,679 Income before taxes on income $ 2,352 $ 1,817 $ 1,000 $ 880 $ 3,352 $ 2,697

Subsequent Events

Subsequent Events	9 Months Ended
	Sep. 30, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On October 25, 2018, CSC’s Board of Directors terminated the existing two share repurchase authorizations and replaced them with a new authorization to repurchase up to a total of $1.0 billion of common stock. On October 31, 2018, CSC issued $500 million aggregate principal amount of Senior Notes that mature in 2024 and $600 million aggregate principal amount of Senior Notes that mature in 2029 under its universal shelf registration statement on file with the SEC. The Senior Notes due 2024 have a fixed interest rate of 3.550% with interest payable semi-annually. The Senior Notes due 2029 have a fixed interest rate of 4.000% with interest payable semi-annually.

New Accounting Standards (Polic

New Accounting Standards (Policy)	9 Months Ended
	Sep. 30, 2018
Accounting Changes and Error Corrections [Abstract]
Basis of Presentation	These unaudited condensed consolidated financial statements have been prepared in conformity with generally accepted accounting principles in the U.S. (GAAP), which require management to make certain estimates and assumptions that affect the reported amounts in the accompanying financial statements, and in the related disclosures. These estimates are based on information available as of the date of the condensed consolidated financial statements. While management makes its best judgment, actual amounts or results could differ from these estimates. In the opinion of management, all normal, recurring adjustments have been included for a fair statement of this interim financial information. These condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto, included in Schwab’s 2017 Form 10-K.
Principles of Consolidation	Principles of Consolidation Schwab evaluates all entities in which it has financial interests for consolidation, except for money market funds, which are specifically excluded from consolidation guidance. When an entity is evaluated for consolidation, Schwab determines whether its interest in the entity constitutes a controlling financial interest under either the variable interest entity (VIE) model or a voting interest entity (VOE) model. In evaluating whether Schwab’s interest in a VIE is a controlling financial interest, we consider whether our involvement, in the context of the design, purpose, and risks of the VIE, as well as any involvement of related parties, provides us with (i) the power to direct the most significant activities of the VIE, and (ii) the obligation to absorb losses or receive benefits that are significant to the VIE. If both of these conditions exist, then Schwab would be the primary beneficiary of that VIE, and consolidate it. Based upon the assessments for all of our interests in VIEs, there are no cases where Schwab is the primary beneficiary; therefore, we are not required to consolidate any VIEs. Schwab consolidates all VOEs in which it has majority-voting interests. Investments in entities in which Schwab does not have a controlling financial interest are accounted for under the equity method of accounting when we have the ability to exercise significant influence over operating and financing decisions of the entity. Investments in entities for which Schwab does not have the ability to exercise significant influence are generally carried at cost and adjusted for impairment and observable price changes of the identical or similar investments of the same issuer (adjusted cost method), except for certain investments in qualified affordable housing projects which are accounted for under the proportional amortization method. All equity method, adjusted cost method, and proportional amortization method investments are included in other assets on the condensed consolidated balance sheets.
Adoption of New Accounting Standards and New Accounting Standards Not Yet Adopted	Adoption of New Accounting Standards Standard Description Date of Adoption Effects on the Financial Statements or Other Significant Matters Accounting Standards Update (ASU) 2014-09, “Revenue from Contracts with Customers (Topic 606)” and related ASUs Clarifies that revenue from contracts with clients should be recognized in a manner that depicts the timing of the related transfer of goods or performance of services at an amount that reflects the expected consideration. January 1, 2018 The guidance does not apply to revenue earned from the Company’s loans and securities. Accordingly, net interest revenue was not impacted. The primary impact for the Company was the capitalization on the consolidated balance sheets of sales commissions paid to employees for obtaining new contracts with clients. These capitalized costs resulted in an asset of $219 million and a related deferred tax liability of $52 million upon adoption. The asset is being amortized to expense over time as the related revenues are recognized. ASU 2016-01, “Financial Instruments – Overall (Subtopic 825-10)” and ASU 2018-03, “Technical Corrections and Improvements to Financial Instruments – Overall (Subtopic 825-10)” Requires: (i) equity investments to be measured at fair value, with changes in fair value recognized in net income, unless the equity method is applied or the equity investments do not have readily determinable fair values in which case a practical alternative may be elected; (ii) use of an exit price when measuring the fair value of financial instruments for disclosures; (iii) separate presentation of financial assets and liabilities by measurement category and form of instrument on the balance sheet or in the accompanying notes. January 1, 2018 The Company adopted this guidance on a prospective basis for its equity securities that do not have readily determinable fair values. No other significant changes resulted from adoption. Therefore, there was no material impact on the Company’s financial statements. ASU 2016-18, “Statement of Cash Flows (Topic 230) – Restricted Cash a Consensus of the Emerging Issues Task Force” Requires that the statement of cash flows explain the change during the period in the total cash and cash equivalents, including restricted cash and cash equivalents. January 1, 2018 The Company adopted this guidance on a retrospective basis. The Company has significant amounts of restricted cash and cash equivalents due to its business as a broker-dealer. Standard Description Date of Adoption Effects on the Financial Statements or Other Significant Matters ASU 2018-02, “Income Statement – Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income” Permits reclassification of the impacts on certain tax affected items included in AOCI that were adjusted through income from continuing operations rather than AOCI upon the effective date of the Tax Act. January 1, 2018 The Company adopted this guidance as of January 1, 2018. The Company elected to reclassify the income tax effects of the Tax Act from items in AOCI into retained earnings as of the beginning of the period of adoption. New Accounting Standards Not Yet Adopted Standard Description Required Date of Adoption Effects on the Financial Statements or Other Significant Matters ASU 2016-02, “Leases (Topic 842)” Amends the accounting for leases by lessees and lessors. The primary change from the new guidance is the recognition of right-of-use assets and lease liabilities by lessees for those leases classified as operating leases. Additional changes include accounting for lease origination and executory costs, required lessee reassessments during the lease term due to changes in circumstances, and expanded lease disclosures. January 1, 2019 The Company plans to adopt the new lease accounting guidance prospectively as of January 1, 2019 with a cumulative-effect adjustment to the opening balance of retained earnings (i.e., prior periods will not be adjusted). The Company does not expect this guidance will have a material impact on its earnings per common share (EPS). However, it will result in a gross up of the consolidated balance sheet due to recognition of right-of-use assets and lease liabilities primarily related to leases of office space and branches. These amounts will be based on the present value of our remaining operating lease payments (see Note 13 in the 2017 10-K for the undiscounted rental commitments for operating leases). The Company is refining its methodology to estimate the right-of-use assets and lease liabilities. We are also testing system updates and refining internal controls for applying the lease accounting changes. Based upon our current population of leases, we expect the right-of-use asset and corresponding lease liability to be less than 0.5% of our total assets. Standard Description Required Date of Adoption Effects on the Financial Statements or Other Significant Matters ASU 2016-13, “Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments” Provides guidance for recognizing impairment of most debt instruments measured at amortized cost, including loans and held to maturity (HTM) debt securities. Requires estimating current expected credit losses (CECL) over the remaining life of an instrument or a portfolio of instruments with similar risk characteristics based on relevant information about past events, current conditions, and reasonable forecasts. The initial estimate of, and the subsequent changes in, CECL will be recognized as credit loss expense through current earnings and will be reflected as an allowance for credit losses offsetting the carrying value of the financial instrument(s) on the balance sheet. Amends the OTTI model for available for sale (AFS) debt securities by requiring the use of an allowance, rather than directly reducing the carrying value of the security, and eliminating consideration of the length of time such security has been in an unrealized loss position as a factor in concluding whether a credit loss exists. January 1, 2020 (early adoption permitted) The Company continues to evaluate the impact of this guidance on its financial statements, including EPS. The Company has finished the majority of its scoping work and assessment of the current state of data and systems. Work is transitioning to designing and building out approaches to address certain asset classes with a focus primarily on a subset of our securities, including corporate debt securities. The Company expects that a large portion of its securities will have zero expectation of credit losses based on industry and regulator views for U.S. treasury and certain government agency-backed securities. We are currently working on in-depth analysis for the other asset types that do not have zero expectation of credit losses to determine our methods and any needed changes to policies and procedures. ASU 2017-08, “Receivables – Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities” Shortens the amortization period for the premium on certain callable debt securities to the earliest call date. The amendments are applicable to any purchased individual debt security with an explicit and noncontingent call feature with a fixed price on a preset date. ASU 2017-08 does not impact the accounting for callable debt securities held at a discount. January 1, 2019 (early adoption permitted) While still under evaluation, the Company does not expect this guidance will have a material impact on its financial statements, including EPS. Standard Description Required Date of Adoption Effects on the Financial Statements or Other Significant Matters ASU 2018-15, “Intangibles–Goodwill and Other–Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract (a consensus of the FASB Emerging Issues Task Force)” Aligns the criteria for capitalizing implementation costs for cloud computing arrangements (CCA) that are service contracts with internal-use software that is developed or purchased and CCAs that include an internal-use software license. This guidance requires that the capitalized implementation costs be recognized over the period of the CCA service contract, subject to impairment evaluation on an ongoing basis. The guidance prescribes the balance sheet, income statement, and statement of cash flow classification of the capitalized implementation costs and related amortization expense, and requires additional quantitative and qualitative disclosures. Adoption provides for retrospective or prospective application to all implementation costs incurred after the date of adoption. January 1, 2020 (early adoption permitted) Historically, Schwab has expensed implementation costs as they are incurred for CCAs that are service contracts. Therefore, adopting this guidance will change the Company’s accounting treatment for these types of implementation costs. The Company is evaluating the impacts of this guidance on its financial statements, including EPS.

New Accounting Standards (Table

New Accounting Standards (Tables)	9 Months Ended
	Sep. 30, 2018
Accounting Changes and Error Corrections [Abstract]
Schedule of New Accounting Pronouncements	The cumulative effect of the changes made to our consolidated January 1, 2018 balance sheet for the adoption of ASU 2014-09, “Revenue – Revenue from Contracts with Customers” and ASU 2018-02, “Other Comprehensive Income – Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income” were as follows: Balance at Adjustments Due to ASU 2014-09 Adjustments Due to ASU 2018-02 Balance at Assets Other assets (1) $ 2,057 $ 167 $ — $ 2,224 Stockholders’ Equity Retained earnings 14,408 167 33 14,608 Accumulated other comprehensive income (152 ) — (33 ) (185 ) (1) Adjustment is comprised of an increase in capitalized contract costs of $219 million , partially offset by an increase in deferred tax liabilities of $52 million . In accordance with the new revenue standard requirements, the disclosure of the impact of adoption on our condensed consolidated statement of income and condensed consolidated balance sheet were as follows: Three Months Ended September 30, 2018 Statement of Income As Reported Balances Without Adoption of ASU 2014-09 Effect of Change Expenses Excluding Interest Compensation and benefits $ 737 $ 744 $ (7 ) Taxes on income 296 294 2 Net Income 923 918 5 Nine Months Ended September 30, 2018 Statement of Income As Reported Balances Without Adoption of ASU 2014-09 Effect of Change Expenses Excluding Interest Compensation and benefits $ 2,252 $ 2,279 $ (27 ) Taxes on income 780 773 7 Net Income 2,572 2,552 20 As of September 30, 2018 Balance Sheet As Reported Balances Without Adoption of ASU 2014-09 Effect of Change Assets Other assets (1) $ 2,092 $ 1,905 $ 187 Stockholders’ Equity Retained earnings 16,615 16,428 187 (1) Adjustment is comprised of an increase in capitalized contract costs of $246 million , partially offset by an increase in deferred tax liabilities of $59 million .

Revenue Recognition (Tables)

Revenue Recognition (Tables)	9 Months Ended
	Sep. 30, 2018
Revenue from Contract with Customer [Abstract]
Disaggregation of Schwab's Revenue	Disaggregation of Schwab’s revenue by major source is as follows: Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 Net interest revenue Interest revenue $ 1,755 $ 1,176 $ 4,766 $ 3,358 Interest expense (228 ) (94 ) (569 ) (223 ) Net interest revenue 1,527 1,082 4,197 3,135 Asset management and administration fees Mutual funds and ETF service fees 435 519 1,386 1,538 Advice solutions 294 265 859 765 Other 80 77 229 226 Asset management and administration fees 809 861 2,474 2,529 Trading revenue Commissions 155 136 501 456 Principal transactions 21 15 56 44 Trading revenue 176 151 557 500 Other 67 71 235 212 Total net revenues $ 2,579 $ 2,165 $ 7,463 $ 6,376

Investment Securities (Tables)

Investment Securities (Tables)	9 Months Ended
	Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract]
Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value of Securities Available for Sale and Securities Held to Maturity	The amortized cost, gross unrealized gains and losses, and fair value of AFS and HTM securities are as follows: September 30, 2018 Amortized Gross Gross Fair Available for sale securities U.S. agency mortgage-backed securities $ 24,010 $ 47 $ 102 $ 23,955 U.S. Treasury securities 12,412 — 169 12,243 Asset-backed securities (1) 9,378 19 10 9,387 Corporate debt securities (2) 6,921 10 9 6,922 Certificates of deposit 2,765 4 — 2,769 U.S. agency notes 1,688 — 6 1,682 Commercial paper (2,3) 518 — — 518 Foreign government agency securities 50 — 2 48 Non-agency commercial mortgage-backed securities 34 — — 34 Total available for sale securities $ 57,776 $ 80 $ 298 $ 57,558 Held to maturity securities U.S. agency mortgage-backed securities $ 113,453 $ 26 $ 3,483 $ 109,996 Asset-backed securities (1) 17,964 122 12 18,074 Corporate debt securities (2) 4,578 8 55 4,531 U.S. state and municipal securities 1,330 6 7 1,329 Non-agency commercial mortgage-backed securities 1,149 1 25 1,125 U.S. Treasury securities 223 — 11 212 Certificates of deposit 200 1 — 201 Foreign government agency securities 50 — 2 48 Other 5 — — 5 Total held to maturity securities $ 138,952 $ 164 $ 3,595 $ 135,521 December 31, 2017 Available for sale securities U.S. agency mortgage-backed securities $ 20,915 $ 53 $ 39 $ 20,929 U.S. Treasury securities 9,583 — 83 9,500 Asset-backed securities (1) 9,019 34 6 9,047 Corporate debt securities (2) 6,154 16 1 6,169 Certificates of deposit 2,040 2 1 2,041 U.S. agency notes 1,914 — 8 1,906 Commercial paper (2) 313 — — 313 Foreign government agency securities 51 — 1 50 Non-agency commercial mortgage-backed securities 40 — — 40 Total available for sale securities $ 50,029 $ 105 $ 139 $ 49,995 Held to maturity securities U.S. agency mortgage-backed securities $ 101,197 $ 290 $ 1,034 $ 100,453 Asset-backed securities (1) 12,937 127 2 13,062 Corporate debt securities (2) 4,078 13 5 4,086 U.S. state and municipal securities 1,247 57 — 1,304 Non-agency commercial mortgage-backed securities 994 10 5 999 U.S. Treasury securities 223 — 3 220 Certificates of deposit 200 — — 200 Foreign government agency securities 50 — 1 49 Total held to maturity securities $ 120,926 $ 497 $ 1,050 $ 120,373 (1) Approximately 37% and 42% of asset-backed securities held as of September 30, 2018 and December 31, 2017 , respectively, were Federal Family Education Loan Program Asset-Backed Securities. Asset-backed securities collateralized by credit card receivables represented approximately 43% and 40% of the asset-backed securities held as of September 30, 2018 and December 31, 2017 , respectively. (2) As of September 30, 2018 and December 31, 2017 , approximately 31% and 41% , respectively, of the total AFS and HTM investments in corporate debt securities and commercial paper were issued by institutions in the financial services industry. Approximately 18% and 22% of the holdings of these securities were issued by institutions in the information technology industry as of September 30, 2018 and December 31, 2017 , respectively. (3) Included in cash and cash equivalents on the condensed consolidated balance sheet, but excluded from this table is $2.0 billion of AFS commercial paper. These holdings have maturities of three months or less and an aggregate market value equal to amortized cost.
Securities with Unrealized Losses, Aggregated by Category and Period of Continuous Unrealized Loss	Securities with unrealized losses, aggregated by category and period of continuous unrealized loss, are as follows:  Less than 12 months  12 months or longer Total September 30, 2018 Fair Unrealized Fair Unrealized Fair Unrealized Available for sale securities U.S. agency mortgage-backed securities $ 10,119 $ 68 $ 1,988 $ 34 $ 12,107 $ 102 U.S. Treasury securities 7,770 72 4,374 97 12,144 169 Asset-backed securities 1,841 4 601 6 2,442 10 Corporate debt securities 3,030 8 229 1 3,259 9 U.S. agency notes 566 2 1,116 4 1,682 6 Foreign government agency securities — — 48 2 48 2 Total $ 23,326 $ 154 $ 8,356 $ 144 $ 31,682 $ 298 Held to maturity securities U.S. agency mortgage-backed securities $ 59,643 $ 1,247 $ 40,279 $ 2,236 $ 99,922 $ 3,483 Asset-backed securities 2,115 12 39 — 2,154 12 Corporate debt securities 2,862 52 77 3 2,939 55 U.S. state and municipal securities 471 5 14 2 485 7 Non-agency commercial mortgage-backed securities 651 15 279 10 930 25 U.S. Treasury securities — — 212 11 212 11 Foreign government agency securities — — 48 2 48 2 Total $ 65,742 $ 1,331 $ 40,948 $ 2,264 $ 106,690 $ 3,595 Total securities with unrealized losses (1) $ 89,068 $ 1,485 $ 49,304 $ 2,408 $ 138,372 $ 3,893 December 31, 2017 Available for sale securities U.S. agency mortgage-backed securities $ 5,696 $ 21 $ 2,548 $ 18 $ 8,244 $ 39 U.S. Treasury securities 4,625 11 4,875 72 9,500 83 Asset-backed securities 904 3 424 3 1,328 6 Corporate debt securities 736 1 120 — 856 1 Certificates of deposit 799 1 — — 799 1 U.S. agency notes 99 — 1,807 8 1,906 8 Foreign government agency securities 50 1 — — 50 1 Total $ 12,909 $ 38 $ 9,774 $ 101 $ 22,683 $ 139 Held to maturity securities U.S. agency mortgage-backed securities $ 42,102 $ 310 $ 24,753 $ 724 $ 66,855 $ 1,034 Asset-backed securities 1,124 2 72 — 1,196 2 Corporate debt securities 1,078 5 — — 1,078 5 Non-agency commercial mortgage-backed securities 607 5 — — 607 5 U.S. Treasury securities 220 3 — — 220 3 Foreign government agency securities 49 1 — — 49 1 Total $ 45,180 $ 326 $ 24,825 $ 724 $ 70,005 $ 1,050 Total securities with unrealized losses (2) $ 58,089 $ 364 $ 34,599 $ 825 $ 92,688 $ 1,189 (1) The number of investment positions with unrealized losses totaled 413 for AFS securities and 1,800 for HTM securities. (2) The number of investment positions with unrealized losses totaled 251 for AFS securities and 938 for HTM securities.
Maturities of Securities Available for Sale and Securities Held to Maturity	The maturities of AFS and HTM securities are as follows: September 30, 2018 Within After 1 year After 5 years After Total Available for sale securities U.S. agency mortgage-backed securities (1) $ 169 $ 3,669 $ 10,571 $ 9,546 $ 23,955 U.S. Treasury securities 5,999 6,244 — — 12,243 Asset-backed securities 250 6,968 1,750 419 9,387 Corporate debt securities 1,621 5,301 — — 6,922 Certificates of deposit 866 1,903 — — 2,769 U.S. agency notes 1,311 371 — — 1,682 Commercial paper 518 — — — 518 Foreign government agency securities — 48 — — 48 Non-agency commercial mortgage-backed securities (1) — — — 34 34 Total fair value $ 10,734 $ 24,504 $ 12,321 $ 9,999 $ 57,558 Total amortized cost $ 10,762 $ 24,632 $ 12,368 $ 10,014 $ 57,776 Held to maturity securities U.S. agency mortgage-backed securities (1) $ 383 $ 14,370 $ 31,785 $ 63,458 $ 109,996 Asset-backed securities 5 1,611 9,373 7,085 18,074 Corporate debt securities 238 3,550 743 — 4,531 U.S. state and municipal securities — 59 254 1,016 1,329 Non-agency commercial mortgage-backed securities (1) — 353 — 772 1,125 U.S. Treasury securities — — 212 — 212 Certificates of deposit — 201 — — 201 Foreign government agency securities — 48 — — 48 Other — — — 5 5 Total fair value $ 626 $ 20,192 $ 42,367 $ 72,336 $ 135,521 Total amortized cost $ 628 $ 20,540 $ 43,339 $ 74,445 $ 138,952 (1) Mortgage-backed securities have been allocated to maturity groupings based on final contractual maturities. Actual maturities will differ from final contractual maturities because borrowers on a certain portion of loans underlying these securities have the right to prepay their obligations.
Proceeds and Gross Realized Gains And Losses from Sales of Securities Available for Sale	Proceeds and gross realized gains and losses from sales of AFS securities are as follows: Three Months Ended Nine Months Ended 2018 2017 2018 2017 Proceeds $ — $ 288 $ 115 $ 5,773 Gross realized gains — — — 7

Bank Loans and Related Allowa_2

Bank Loans and Related Allowance for Loan Losses (Tables)	9 Months Ended
	Sep. 30, 2018
Receivables [Abstract]
Composition of Bank Loans and Delinquency Analysis by Loan Segment	The composition of bank loans and delinquency analysis by loan type is as follows: September 30, 2018 Current 30-59 days 60-89 days > 90 days past (3) Total past due Total Allowance Total First Mortgages (1,2) $ 10,217 $ 24 $ 2 $ 13 $ 39 $ 10,256 $ 17 $ 10,239 HELOCs (1,2) 1,589 2 1 10 13 1,602 7 1,595 Pledged asset lines 4,552 3 1 — 4 4,556 — 4,556 Other 176 — — — — 176 2 174 Total bank loans $ 16,534 $ 29 $ 4 $ 23 $ 56 $ 16,590 $ 26 $ 16,564 December 31, 2017 First Mortgages (1,2) $ 9,983 $ 14 $ 2 $ 17 $ 33 $ 10,016 $ 16 $ 10,000 HELOCs (1,2) 1,928 — 3 12 15 1,943 8 1,935 Pledged asset lines 4,361 4 4 — 8 4,369 — 4,369 Other 176 — — — — 176 2 174 Total bank loans $ 16,448 $ 18 $ 9 $ 29 $ 56 $ 16,504 $ 26 $ 16,478 (1) First Mortgages and HELOCs include unamortized premiums and discounts and direct origination costs of $73 million and $77 million at September 30, 2018 and December 31, 2017 , respectively. (2) At September 30, 2018 and December 31, 2017 , 47% and 48% , respectively, of the First Mortgage and HELOC portfolios were concentrated in California. These loans have performed in a manner consistent with the portfolio as a whole. (3) There were no loans accruing interest that were contractually 90 days or more past due at September 30, 2018 or December 31, 2017 .
Changes in Allowance for Loan Losses	Changes in the allowance for loan losses were as follows: September 30, 2018 September 30, 2017 Three Months Ended First Mortgages HELOCs Other Total (1) First Mortgages HELOCs Other Total (1) Balance at beginning of period $ 17 $ 7 $ 2 $ 26 $ 17 $ 8 $ 1 $ 26 Charge-offs — — — — (1 ) — — (1 ) Recoveries — 1 — 1 — — 1 1 Provision for loan losses — (1 ) — (1 ) — — — — Balance at end of period $ 17 $ 7 $ 2 $ 26 $ 16 $ 8 $ 2 $ 26 Nine Months Ended Balance at beginning of period $ 16 $ 8 $ 2 $ 26 $ 17 $ 8 $ 1 $ 26 Charge-offs — — (1 ) (1 ) (2 ) (1 ) — (3 ) Recoveries — 2 — 2 1 1 1 3 Provision for loan losses 1 (3 ) 1 (1 ) — — — — Balance at end of period $ 17 $ 7 $ 2 $ 26 $ 16 $ 8 $ 2 $ 26 (1) All pledged asset lines (PALs) were fully collateralized by securities with fair values in excess of borrowings at September 30, 2018 and December 31, 2017 .
Impaired Bank Loan Related Assets	A summary of impaired bank loan-related assets is as follows: September 30, 2018 December 31, 2017 Nonaccrual loans (1) $ 23 $ 28 Other real estate owned (2) 3 3 Total nonperforming assets 26 31 Troubled debt restructurings 4 11 Total impaired assets $ 30 $ 42 (1) Nonaccrual loans include nonaccrual troubled debt restructurings. (2) Included in other assets on the condensed consolidated balance sheets.
Credit Quality Indicators of Bank Loan Portfolio	The credit quality indicators of the Company’s bank loan portfolio are detailed below: September 30, 2018 Balance Weighted Average Utilization (1) Percent of First Mortgages Estimated Current LTV < 70% $ 9,383 777 N/A 0.05 % >70% – < 90% 868 771 N/A 0.24 % >90% – < 100% 4 713 N/A 8.70 % >100% 1 742 N/A — Total $ 10,256 776 N/A 0.07 % HELOCs Estimated Current LTV (2) < 70% $ 1,509 771 31 % 0.18 % >70% – < 90% 84 752 47 % 0.90 % >90% – < 100% 5 746 77 % 0.90 % >100% 4 704 81 % 5.28 % Total $ 1,602 770 31 % 0.24 % Pledged asset lines Weighted-Average LTV (2) =70% $ 4,556 766 36 % — December 31, 2017 Balance Weighted Average Utilization (1) Percent of First Mortgages Estimated Current LTV < 70% $ 9,046 775 N/A 0.09 % >70% – < 90% 961 769 N/A 0.46 % >90% – < 100% 5 714 N/A 10.49 % >100% 4 713 N/A 6.23 % Total $ 10,016 775 N/A 0.14 % HELOCs Estimated Current LTV (2) < 70% $ 1,773 772 32 % 0.18 % >70% – < 90% 148 755 47 % 0.84 % >90% – < 100% 14 742 64 % 2.85 % >100% 8 718 72 % 4.91 % Total $ 1,943 770 33 % 0.27 % Pledged asset lines Weighted-Average LTV (2) =70% $ 4,369 765 41 % — (1) The Utilization Rate is calculated using the outstanding balance divided by the associated total line of credit. (2) Represents the LTV for the full line of credit (drawn and undrawn). N/A Not applicable. September 30, 2018 First Mortgages HELOCs Year of origination Pre-2014 $ 2,144 $ 1,156 2014 436 93 2015 1,087 110 2016 2,662 96 2017 2,420 101 2018 1,507 46 Total $ 10,256 $ 1,602 Origination FICO <620 $ 5 — 620 – 679 83 8 680 – 739 1,595 305 > 740 8,573 1,289 Total $ 10,256 $ 1,602 Origination LTV < 70% $ 7,737 $ 1,127 >70% – < 90% 2,514 468 >90% – < 100% 5 7 Total $ 10,256 $ 1,602 December 31, 2017 First Mortgages HELOCs Year of origination Pre-2014 $ 2,804 $ 1,496 2014 530 116 2015 1,218 128 2016 2,886 111 2017 2,578 92 Total $ 10,016 $ 1,943 Origination FICO <620 $ 6 $ 1 620 – 679 89 10 680 – 739 1,569 365 > 740 8,352 1,567 Total $ 10,016 $ 1,943 Origination LTV < 70% $ 7,569 $ 1,360 >70% – < 90% 2,441 574 >90% – < 100% 6 9 Total $ 10,016 $ 1,943
Converting to Amortizing Loans	The following table presents when current outstanding HELOCs will convert to amortizing loans: September 30, 2018 Balance Converted to an amortizing loan by period end $ 640 Within 1 year 186 > 1 year – 3 years 133 > 3 years – 5 years 163 > 5 years 480 Total $ 1,602

Variable Interest Entities (Tab

Variable Interest Entities (Tables)	9 Months Ended
	Sep. 30, 2018
Variable Interest Entities [Abstract]
Aggregate Assets, Liabilities and Maximum Exposure to Loss	The aggregate assets, liabilities, and maximum exposure to loss from those VIEs in which Schwab holds a variable interest, but is not the primary beneficiary, are summarized in the table below: September 30, 2018 December 31, 2017 Aggregate Aggregate Maximum Aggregate Aggregate Maximum LIHTC investments (1) $ 347 $ 204 $ 347 $ 304 $ 203 $ 304 Other CRA investments (2) 68 — 116 69 — 125 Total $ 415 $ 204 $ 463 $ 373 $ 203 $ 429 (1) Aggregate assets and aggregate liabilities are included in other assets and accrued expenses and other liabilities, respectively, on the condensed consolidated balance sheets. (2) Other CRA investments are recorded using either the adjusted cost method, equity method, or as HTM securities. Aggregate assets are included in HTM securities, bank loans – net, or other assets on the condensed consolidated balance sheets.

Bank Deposits (Tables)

Bank Deposits (Tables)	9 Months Ended
	Sep. 30, 2018
Banking and Thrift [Abstract]
Deposits from Banking Clients Consisting of Interest Bearing and Noninterest Bearing Deposits	Bank deposits consist of interest-bearing and non-interest-bearing deposits as follows: September 30, 2018 December 31, 2017 Interest-bearing deposits: Deposits swept from brokerage accounts $ 194,337 $ 148,212 Checking 12,230 13,388 Savings and other 6,153 7,264 Total interest-bearing deposits 212,720 168,864 Non-interest-bearing deposits 688 792 Total bank deposits $ 213,408 $ 169,656

Borrowings (Tables)

Borrowings (Tables)	9 Months Ended
	Sep. 30, 2018
Debt Disclosure [Abstract]
Long-term Debt Including Unamortized Debt Discounts and Premiums	The following table lists long-term debt by instrument outstanding as of September 30, 2018 and December 31, 2017 . Date of Principal Amount Outstanding Issuance September 30, 2018 December 31, 2017 Fixed-rate Senior Notes: 1.500% due March 10, 2018 (1) 03/10/15 $ — $ 625 2.200% due July 25, 2018 (2) 07/25/13 — 275 4.450% due July 22, 2020 07/22/10 700 700 3.250% due May 21, 2021 05/22/18 600 — 3.225% due September 1, 2022 08/29/12 256 256 2.650% due January 25, 2023 12/07/17 800 800 3.000% due March 10, 2025 03/10/15 375 375 3.850% due May 21, 2025 05/22/18 750 — 3.450% due February 13, 2026 11/13/15 350 350 3.200% due March 2, 2027 03/02/17 650 650 3.200% due January 25, 2028 12/07/17 700 700 Floating-rate Senior Notes: Three-month LIBOR + 0.32% due May 21, 2021 05/22/18 600 — Total Senior Notes 5,781 4,731 5.450% Finance lease obligation (3) 06/04/04 55 61 Unamortized discount — net (13 ) (14 ) Debt issuance costs (33 ) (25 ) Total long-term debt $ 5,790 $ 4,753 (1) Redeemed on February 8, 2018. (2) Redeemed on June 25, 2018. (3) Schwab has a finance lease obligation related to an office building and land under a 20 -year lease. The remaining finance lease obligation is being reduced by a portion of the lease payments over the remaining lease term through June 30, 2024.
Annual Maturities on Long-term Debt Outstanding	Annual maturities on long-term debt outstanding at September 30, 2018 are as follows: Maturities 2018 $ 2 2019 8 2020 709 2021 1,209 2022 266 Thereafter 3,642 Total maturities 5,836 Unamortized discount — net (13 ) Debt issuance costs (33 ) Total long-term debt $ 5,790

Commitments and Contingencies (

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Schedule of Commitments to Purchase or Sell	The Company’s commitments to extend credit on bank lines of credit and to purchase First Mortgages are as follows: September 30, 2018 December 31, 2017 Commitments to extend credit related to unused HELOCs, PALs, and other lines of credit $ 11,028 $ 10,060 Commitments to purchase First Mortgage loans 355 308 Total $ 11,383 $ 10,368

Financial Instruments Subject_2

Financial Instruments Subject to Off-Balance Sheet Credit Risk (Tables)	9 Months Ended
	Sep. 30, 2018
Offsetting [Abstract]
Offsetting Assets and Liabilities	The following table presents information about our resale agreements and securities lending activity depicting the potential effect of rights of setoff between these recognized assets and recognized liabilities at September 30, 2018 and December 31, 2017 . Gross Amounts Not Offset in the Gross Gross Amounts Net Amounts Counterparty Collateral Net September 30, 2018 Assets Resale agreements (1) $ 4,424 $ — $ 4,424 $ — $ (4,424 ) (2) $ — Securities borrowed (3) 346 — 346 (316 ) (30 ) — Total $ 4,770 $ — $ 4,770 $ (316 ) $ (4,454 ) $ — Liabilities Securities loaned (4,5) $ 1,062 $ — $ 1,062 $ (316 ) $ (652 ) $ 94 Total $ 1,062 $ — $ 1,062 $ (316 ) $ (652 ) $ 94 December 31, 2017 Assets Resale agreements (1) $ 6,596 $ — $ 6,596 $ — $ (6,596 ) (2) $ — Securities borrowed (3) 222 — 222 (199 ) (22 ) 1 Total $ 6,818 $ — $ 6,818 $ (199 ) $ (6,618 ) $ 1 Liabilities Securities loaned (4,5) $ 966 $ — $ 966 $ (199 ) $ (670 ) $ 97 Total $ 966 $ — $ 966 $ (199 ) $ (670 ) $ 97 (1) Included in cash and investments segregated and on deposit for regulatory purposes in the condensed consolidated balance sheets. (2) Actual collateral was greater than or equal to 102% of the related assets. At September 30, 2018 and December 31, 2017 , the fair value of collateral received in connection with resale agreements that are available to be repledged or sold was $4.5 billion and $6.7 billion , respectively. (3) Included in receivables from brokers, dealers, and clearing organizations in the condensed consolidated balance sheets. (4) Included in payables to brokers, dealers, and clearing organizations in the condensed consolidated balance sheets. The cash collateral received from counterparties under securities lending transactions was equal to or greater than the market value of the securities loaned at September 30, 2018 and December 31, 2017 . (5) Securities loaned are predominantly comprised of equity securities held in client brokerage accounts with overnight and continuous remaining contractual maturities.
Summary of the Fair Value of Client Securities Available to Utilize as Collateral and Amounts Pledged	The following table summarizes the fair value of client securities that were available, under such regulations, that could have been used as collateral, and the amounts that we had pledged: September 30, 2018 December 31, 2017 Fair value of client securities available to be pledged $ 28,806 $ 25,905 Fair value of client securities pledged for: Fulfillment of requirements with the Options Clearing Corporation (1) 3,036 2,280 Fulfillment of client short sales 1,923 2,011 Securities lending to other broker-dealers 872 784 Total collateral pledged $ 5,831 $ 5,075 Note: Excludes amounts available and pledged for securities lending from fully-paid client securities. The fair value of fully-paid client securities available and pledged was $88 million as of September 30, 2018 and $78 million as of December 31, 2017 . (1) Client securities pledged to fulfill client margin requirements for open option contracts established with the Options Clearing Corporation.

Fair Values of Assets and Lia_2

Fair Values of Assets and Liabilities (Tables)	9 Months Ended
	Sep. 30, 2018
Fair Value Disclosures [Abstract]
Fair Value Hierarchy for Assets and Liabilities Measured at Fair Value on a Recurring Basis	The following tables present the fair value hierarchy for assets measured at fair value on a recurring basis. Liabilities recorded at fair value were not material, and therefore are not included in the following tables: September 30, 2018 Level 1 Level 2 Level 3 Balance at Cash equivalents: Money market funds $ 552 $ — $ — $ 552 Commercial paper — 1,988 — 1,988 Total cash equivalents 552 1,988 — 2,540 Investments segregated and on deposit for regulatory purposes: Certificates of deposit — 1,950 — 1,950 Total investments segregated and on deposit for regulatory purposes — 1,950 — 1,950 Other securities owned: Equity and bond mutual funds 394 — — 394 Schwab Funds ® money market funds 21 — — 21 State and municipal debt obligations — 44 — 44 Equity, U.S. Government and corporate debt, and other securities 3 38 — 41 Total other securities owned 418 82 — 500 Available for sale securities: U.S. agency mortgage-backed securities — 23,955 — 23,955 U.S. Treasury securities — 12,243 — 12,243 Asset-backed securities — 9,387 — 9,387 Corporate debt securities — 6,922 — 6,922 Certificates of deposit — 2,769 — 2,769 U.S. agency notes — 1,682 — 1,682 Commercial paper — 518 — 518 Foreign government agency securities — 48 — 48 Non-agency commercial mortgage-backed securities — 34 — 34 Total available for sale securities — 57,558 — 57,558 Total $ 970 $ 61,578 $ — $ 62,548 December 31, 2017 Level 1 Level 2 Level 3 Balance at Cash equivalents: Money market funds $ 2,727 $ — $ — $ 2,727 Total cash equivalents 2,727 — — 2,727 Investments segregated and on deposit for regulatory purposes: Certificates of deposit — 2,198 — 2,198 U.S. Government securities — 3,658 — 3,658 Total investments segregated and on deposit for regulatory purposes — 5,856 — 5,856 Other securities owned: Equity and bond mutual funds 318 — — 318 Schwab Funds ® money market funds 135 — — 135 State and municipal debt obligations — 52 — 52 Equity, U.S. Government and corporate debt, and other securities 2 32 — 34 Total other securities owned 455 84 — 539 Available for sale securities: U.S. agency mortgage-backed securities — 20,929 — 20,929 U.S. Treasury securities — 9,500 — 9,500 Asset-backed securities — 9,047 — 9,047 Corporate debt securities — 6,169 — 6,169 Certificates of deposit — 2,041 — 2,041 U.S. agency notes — 1,906 — 1,906 Commercial paper — 313 — 313 Foreign government agency securities — 50 — 50 Non-agency commercial mortgage-backed securities — 40 — 40 Total available for sale securities — 49,995 — 49,995 Total $ 3,182 $ 55,935 $ — $ 59,117
Fair Value of Other Financial Instruments	The following tables present the fair value hierarchy for other financial instruments: September 30, 2018 Carrying Level 1 Level 2 Level 3 Balance at Assets Cash and cash equivalents $ 19,290 $ — $ 19,290 $ — $ 19,290 Cash and investments segregated and on deposit for 6,526 — 6,526 — 6,526 Receivables from brokers, dealers, and clearing 798 — 798 — 798 Receivables from brokerage clients — net 22,402 — 22,402 — 22,402 Held to maturity securities: U.S. agency mortgage-backed securities 113,453 — 109,996 — 109,996 Asset-backed securities 17,964 — 18,074 — 18,074 Corporate debt securities 4,578 — 4,531 — 4,531 U.S. state and municipal securities 1,330 — 1,329 — 1,329 Non-agency commercial mortgage-backed securities 1,149 — 1,125 — 1,125 U.S. Treasury securities 223 — 212 — 212 Certificates of deposit 200 — 201 — 201 Foreign government agency securities 50 — 48 — 48 Other 5 — 5 — 5 Total held to maturity securities 138,952 — 135,521 — 135,521 Bank loans — net: First Mortgages 10,239 — 9,963 — 9,963 HELOCs 1,595 — 1,664 — 1,664 Pledged asset lines 4,556 — 4,556 — 4,556 Other 174 — 174 — 174 Total bank loans — net 16,564 — 16,357 — 16,357 Other assets 463 — 463 — 463 Total $ 204,995 $ — $ 201,357 $ — $ 201,357 Liabilities Bank deposits $ 213,408 $ — $ 213,408 $ — $ 213,408 Payables to brokers, dealers, and clearing organizations 1,522 — 1,522 — 1,522 Payables to brokerage clients 27,851 — 27,851 — 27,851 Accrued expenses and other liabilities 1,177 — 1,177 — 1,177 Long-term debt 5,790 — 5,687 — 5,687 Total $ 249,748 $ — $ 249,645 $ — $ 249,645 December 31, 2017 Carrying Level 1 Level 2 Level 3 Balance at Assets Cash and cash equivalents $ 11,490 $ — $ 11,490 $ — $ 11,490 Cash and investments segregated and on deposit for 9,277 — 9,277 — 9,277 Receivables from brokers, dealers, and clearing 649 — 649 — 649 Receivables from brokerage clients — net 20,568 — 20,568 — 20,568 Held to maturity securities: U.S. agency mortgage-backed securities 101,197 — 100,453 — 100,453 Asset-backed securities 12,937 — 13,062 — 13,062 Corporate debt securities 4,078 — 4,086 — 4,086 U.S. state and municipal securities 1,247 — 1,304 — 1,304 Non-agency commercial mortgage-backed securities 994 — 999 — 999 U.S. Treasury securities 223 — 220 — 220 Certificates of deposit 200 — 200 — 200 Foreign government agency securities 50 — 49 — 49 Total held to maturity securities 120,926 — 120,373 — 120,373 Bank loans — net: First Mortgages 10,000 — 9,917 — 9,917 HELOCs 1,935 — 2,025 — 2,025 Pledged asset lines 4,369 — 4,369 — 4,369 Other 174 — 174 — 174 Total bank loans — net 16,478 — 16,485 — 16,485 Other assets 781 — 781 — 781 Total $ 180,169 $ — $ 179,623 $ — $ 179,623 Liabilities Bank deposits $ 169,656 $ — $ 169,656 $ — $ 169,656 Payables to brokers, dealers, and clearing organizations 1,287 — 1,287 — 1,287 Payables to brokerage clients 31,243 — 31,243 — 31,243 Accrued expenses and other liabilities 1,463 — 1,463 — 1,463 Short-term borrowings 15,000 — 15,000 — 15,000 Long-term debt 4,753 — 4,811 — 4,811 Total $ 223,402 $ — $ 223,460 $ — $ 223,460

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	9 Months Ended
	Sep. 30, 2018
Equity [Abstract]
Preferred Stock Issued and Outstanding	The Company’s preferred stock issued and outstanding is as follows: Liquidation Preference Per Share Dividend Rate in Effect at September 30, 2018 Earliest Redemption Date Date at Which Dividend Rate Becomes Floating Floating Annual Rate of Three-Month LIBOR plus: Shares Issued and Outstanding (In thousands) at Carrying Value at September 30, 2018 (1) December 31, 2017 (1) September 30, 2018 December 31, 2017 Issue Date Fixed-rate: Series C 600 600 $ 1,000 $ 585 $ 585 08/03/15 6.000 % 12/01/20 N/A N/A Series D 750 750 1,000 728 728 03/07/16 5.950 % 06/01/21 N/A N/A Fixed-to-floating-rate: Series A 400 400 1,000 397 397 01/26/12 7.000 % 02/01/22 02/01/22 4.820 % Series E 6 6 100,000 591 591 10/31/16 4.625 % 03/01/22 03/01/22 3.315 % Series F 5 5 100,000 492 492 10/31/17 5.000 % 12/01/27 12/01/27 2.575 % Total preferred stock 1,761 1,761 $ 2,793 $ 2,793 (1) Represented by depositary shares, except for Series A. N/A Not applicable.

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Tables)	9 Months Ended
	Sep. 30, 2018
Equity [Abstract]
Components of Other Comprehensive Income (Loss)	Accumulated other comprehensive income (AOCI) represents cumulative gains and losses that are not reflected in earnings. The components of other comprehensive income (loss) are as follows: 2018 2017 Three Months Ended September 30, Before Tax Net of Before Tax Net of Change in net unrealized gain (loss) on available for sale securities: Net unrealized gain (loss) $ (43 ) $ 11 $ (32 ) $ — $ — $ — Change in net unrealized gain (loss) on held to maturity securities: Amortization of amounts previously recorded upon transfer from available for sale 8 (2 ) 6 10 (4 ) 6 Other comprehensive income (loss) $ (35 ) $ 9 $ (26 ) $ 10 $ (4 ) $ 6 2018 2017 Nine Months Ended September 30, Before Tax Net of Before Tax Net of Change in net unrealized gain (loss) on available for sale securities: Net unrealized gain (loss) $ (184 ) $ 45 $ (139 ) $ 81 $ (30 ) $ 51 Reclassification of net unrealized loss on securities transferred to held to maturity (1) — — — 227 (85 ) 142 Other reclassifications included in other revenue — — — (7 ) 3 (4 ) Change in net unrealized gain (loss) on held to maturity securities: Reclassification of net unrealized loss on securities transferred from available for sale (1) — — — (227 ) 85 (142 ) Amortization of amounts previously recorded upon transfer from available for sale 26 (6 ) 20 21 (9 ) 12 Other — — — (3 ) 1 (2 ) Other comprehensive income (loss) $ (158 ) $ 39 $ (119 ) $ 92 $ (35 ) $ 57 (1) See Note 5 in the 2017 10-K for discussion of the transfer of securities from the AFS category to the HTM category during the first quarter of 2017.
Accumulated Other Comprehensive Income Balances	AOCI balances are as follows: Total Accumulated Other Comprehensive Income Balance at December 31, 2016 $ (163 ) Available for sale securities: Net unrealized gain (loss) 51 Reclassification of net unrealized loss on securities transferred to held to maturity 142 Other reclassifications included in other revenue (4 ) Held to maturity securities: Reclassification of net unrealized loss on securities transferred from available for sale (142 ) Amortization of amounts previously recorded upon transfer to held to maturity from available for sale 12 Other (2 ) Balance at September 30, 2017 $ (106 ) Balance at December 31, 2017 $ (152 ) Adoption of accounting standards (Note 2) (33 ) Available for sale securities: Net unrealized gain (loss) (139 ) Held to maturity securities: Amortization of amounts previously recorded upon transfer to held to maturity from available for sale 20 Balance at September 30, 2018 $ (304 )

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	9 Months Ended
	Sep. 30, 2018
Earnings Per Share [Abstract]
EPS under Basic and Diluted Computations	EPS under the basic and diluted computations is as follows: Three Months Ended Nine Months Ended 2018 2017 2018 2017 Net income $ 923 $ 618 $ 2,572 $ 1,757 Preferred stock dividends and other (1) (38 ) (43 ) (128 ) (127 ) Net income available to common stockholders $ 885 $ 575 $ 2,444 $ 1,630 Weighted-average common shares outstanding — basic 1,351 1,339 1,349 1,338 Common stock equivalent shares related to stock incentive plans 13 14 14 14 Weighted-average common shares outstanding — diluted (2) 1,364 1,353 1,363 1,352 Basic EPS $ .66 $ .43 $ 1.81 $ 1.22 Diluted EPS $ .65 $ .42 $ 1.79 $ 1.21 (1) Includes preferred stock dividends and undistributed earnings and dividends allocated to non-vested restricted stock units. (2) Antidilutive stock options and restricted stock units excluded from the calculation of diluted EPS totaled 11 million and 9 million shares for the third quarters of 2018 and 2017 , respectively, and 12 million and 10 million shares for the first nine months of 2018 and 2017 , respectively.

Regulatory Requirements (Tables

Regulatory Requirements (Tables)	9 Months Ended
	Sep. 30, 2018
Banking and Thrift [Abstract]
Regulatory Capital and Ratios	The regulatory capital and ratios for CSC (consolidated) and CSB are as follows: Actual Minimum to be Minimum Capital Requirement September 30, 2018 Amount Ratio Amount Ratio Amount Ratio CSC Common Equity Tier 1 Risk-Based Capital $ 17,025 19.6 % N/A $ 3,907 4.5 % Tier 1 Risk-Based Capital 19,818 22.8 % N/A 5,210 6.0 % Total Risk-Based Capital 19,846 22.9 % N/A 6,946 8.0 % Tier 1 Leverage 19,818 7.5 % N/A 10,622 4.0 % CSB Common Equity Tier 1 Risk-Based Capital $ 15,164 20.2 % $ 4,890 6.5 % $ 3,385 4.5 % Tier 1 Risk-Based Capital 15,164 20.2 % 6,018 8.0 % 4,513 6.0 % Total Risk-Based Capital 15,191 20.2 % 7,522 10.0 % 6,018 8.0 % Tier 1 Leverage 15,164 7.1 % 10,668 5.0 % 8,534 4.0 % December 31, 2017 CSC Common Equity Tier 1 Risk-Based Capital $ 14,630 19.3 % N/A $ 3,414 4.5 % Tier 1 Risk-Based Capital 17,423 23.0 % N/A 4,552 6.0 % Total Risk-Based Capital 17,452 23.0 % N/A 6,069 8.0 % Tier 1 Leverage 17,423 7.6 % N/A 9,218 4.0 % CSB Common Equity Tier 1 Risk-Based Capital $ 13,355 20.1 % $ 4,324 6.5 % $ 2,993 4.5 % Tier 1 Risk-Based Capital 13,355 20.1 % 5,321 8.0 % 3,991 6.0 % Total Risk-Based Capital 13,382 20.1 % 6,652 10.0 % 5,321 8.0 % Tier 1 Leverage 13,355 7.1 % 9,462 5.0 % 7,569 4.0 % N/A Not applicable.
Net Capital and Net Capital Requirements	Net capital and net capital requirements for CS&Co are as follows: September 30, 2018 December 31, 2017 Net Capital $ 2,280 $ 2,118 Minimum net capital required 0.250 0.250 2% of aggregate debit balances 476 435 Net Capital in excess of required net capital $ 1,804 $ 1,683

Segment Information (Tables)

Segment Information (Tables)	9 Months Ended
	Sep. 30, 2018
Segment Reporting [Abstract]
Financial Information for Reportable Segments	Financial information for the segments is presented in the following tables: Investor Services Advisor Services Total Three Months Ended September 30, 2018 2017 2018 2017 2018 2017 Net Revenues Net interest revenue $ 1,138 $ 818 $ 389 $ 264 $ 1,527 $ 1,082 Asset management and administration fees 565 595 244 266 809 861 Trading revenue 112 94 64 57 176 151 Other 53 54 14 17 67 71 Total net revenues 1,868 1,561 711 604 2,579 2,165 Expenses Excluding Interest 1,015 918 345 302 1,360 1,220 Income before taxes on income $ 853 $ 643 $ 366 $ 302 $ 1,219 $ 945 Investor Services Advisor Services Total Nine Months Ended September 30, 2018 2017 2018 2017 2018 2017 Net Revenues Net interest revenue $ 3,158 $ 2,366 $ 1,039 $ 769 $ 4,197 $ 3,135 Asset management and administration fees 1,727 1,743 747 786 2,474 2,529 Trading revenue 354 311 203 189 557 500 Other 182 159 53 53 235 212 Total net revenues 5,421 4,579 2,042 1,797 7,463 6,376 Expenses Excluding Interest 3,069 2,762 1,042 917 4,111 3,679 Income before taxes on income $ 2,352 $ 1,817 $ 1,000 $ 880 $ 3,352 $ 2,697

New Accounting Standards (Detai

New Accounting Standards (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Jan. 01, 2018
ASU 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Capitalized costs		$ 219
Deferred tax liability	$ 59	52
ASU 2018-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings		$ 33
ASU 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Percentage of total assets	0.50%

New Accounting Standards (Recla

New Accounting Standards (Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Assets
Other assets	$ 2,092	$ 2,224	$ 2,057
Equity
Retained earnings	16,615	14,608	14,408
Accumulated other comprehensive income (loss)	(304)	(185)	$ (152)	$ (106)	$ (163)
Capitalized contract cost	246	219
Accounting Standards Update 2014-09 and 2018-02 [Member]
Equity
Capitalized contract cost		219
Deferred tax liability		52
ASU 2014-09 [Member]
Equity
Capitalized contract cost	246
Deferred tax liability	$ 59	52
ASU 2014-09 [Member] | Adjustments [Member]
Assets
Other assets		167
Equity
Retained earnings		167
Accumulated other comprehensive income (loss)		0
ASU 2018-02 [Member] | Adjustments [Member]
Assets
Other assets		0
Equity
Retained earnings		33
Accumulated other comprehensive income (loss)		$ (33)

New Accounting Standards (State

New Accounting Standards (Statement of Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Expenses Excluding Interest
Compensation and benefits	$ 737	$ 662	$ 2,252	$ 2,026
Taxes on income	296	327	780	940
Net income	923	$ 618	2,572	$ 1,757	[1]
Balances Without Adoption of ASC 606 [Member] | ASU 2014-09 [Member]
Expenses Excluding Interest
Compensation and benefits	744		2,279
Taxes on income	294		773
Net income	918		2,552
Effect of Change Higher/(Lower) [Member] | ASU 2014-09 [Member]
Expenses Excluding Interest
Compensation and benefits	(7)		(27)
Taxes on income	2		7
Net income	$ 5		$ 20
[1]	Adjusted for the retrospective adoption of ASU 2016-18. See Note 2.

New Accounting Standards (Balan

New Accounting Standards (Balance Sheet) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Assets
Other assets	$ 2,092	$ 2,224	$ 2,057
Stockholders’ Equity
Retained earnings	16,615	14,608	$ 14,408
Capitalized contract cost	246	219
ASU 2014-09 [Member]
Stockholders’ Equity
Capitalized contract cost	246
Deferred tax liability	59	$ 52
Balances Without Adoption of ASC 606 [Member] | ASU 2014-09 [Member]
Assets
Other assets	1,905
Stockholders’ Equity
Retained earnings	16,428
Effect of Change Higher/(Lower) [Member] | ASU 2014-09 [Member]
Assets
Other assets	187
Stockholders’ Equity
Retained earnings	$ 187

Revenue Recognition (Disaggrega

Revenue Recognition (Disaggregated Revenue) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Interest revenue	$ 1,755	$ 1,176	$ 4,766	$ 3,358
Interest expense	(228)	(94)	(569)	(223)
Net interest revenue	1,527	1,082	4,197	3,135
Asset management and administration fees	809	861	2,474	2,529
Trading revenue	176	151	557	500
Other	67	71	235	212
Total net revenues	2,579	2,165	7,463	6,376
Mutual funds and ETF service fees [Member]
Disaggregation of Revenue [Line Items]
Asset management and administration fees	435	519	1,386	1,538
Advice solutions [Member]
Disaggregation of Revenue [Line Items]
Asset management and administration fees	294	265	859	765
Other [Member]
Disaggregation of Revenue [Line Items]
Asset management and administration fees	80	77	229	226
Commissions [Member]
Disaggregation of Revenue [Line Items]
Trading revenue	155	136	501	456
Principal Transactions [Member]
Disaggregation of Revenue [Line Items]
Trading revenue	$ 21	$ 15	$ 56	$ 44

Revenue Recognition (Capitalize

Revenue Recognition (Capitalized Contract Costs and Contract Balances) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018	Jan. 01, 2018
Revenue from Contract with Customer [Abstract]
Deferred contract cost	$ 246	$ 246	$ 219
Amortization expense	12	34
Receivables from contracts with customers	$ 359	$ 359	$ 353

Investment Securities (Amortize

Investment Securities (Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value of Securities Available for Sale and Held to Maturity Securities) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Available for sale securities:
Amortized Cost	$ 57,776	$ 50,029
Gross Unrealized Gains	80	105
Gross Unrealized Losses	298	139
Fair Value	57,558	49,995
Held to maturity securities:
Amortized Cost	138,952	120,926
Gross Unrealized Gains	164	497
Gross Unrealized Losses	3,595	1,050
Fair Value	135,521	120,373
U.S. agency mortgage-backed securities [Member]
Available for sale securities:
Amortized Cost	24,010	20,915
Gross Unrealized Gains	47	53
Gross Unrealized Losses	102	39
Fair Value	23,955	20,929
Held to maturity securities:
Amortized Cost	113,453	101,197
Gross Unrealized Gains	26	290
Gross Unrealized Losses	3,483	1,034
Fair Value	109,996	100,453
U.S. Treasury securities [Member]
Available for sale securities:
Amortized Cost	12,412	9,583
Gross Unrealized Gains	0	0
Gross Unrealized Losses	169	83
Fair Value	12,243	9,500
Held to maturity securities:
Amortized Cost	223	223
Gross Unrealized Gains	0	0
Gross Unrealized Losses	11	3
Fair Value	212	220
Asset-backed securities [Member]
Available for sale securities:
Amortized Cost	9,378	9,019
Gross Unrealized Gains	19	34
Gross Unrealized Losses	10	6
Fair Value	9,387	9,047
Held to maturity securities:
Amortized Cost	17,964	12,937
Gross Unrealized Gains	122	127
Gross Unrealized Losses	12	2
Fair Value	18,074	13,062
Corporate debt securities [Member]
Available for sale securities:
Amortized Cost	6,921	6,154
Gross Unrealized Gains	10	16
Gross Unrealized Losses	9	1
Fair Value	6,922	6,169
Held to maturity securities:
Amortized Cost	4,578	4,078
Gross Unrealized Gains	8	13
Gross Unrealized Losses	55	5
Fair Value	4,531	4,086
Certificates of deposit [Member]
Available for sale securities:
Amortized Cost	2,765	2,040
Gross Unrealized Gains	4	2
Gross Unrealized Losses	0	1
Fair Value	2,769	2,041
Held to maturity securities:
Amortized Cost	200	200
Gross Unrealized Gains	1	0
Gross Unrealized Losses	0	0
Fair Value	201	200
U.S. agency notes [Member]
Available for sale securities:
Amortized Cost	1,688	1,914
Gross Unrealized Gains	0	0
Gross Unrealized Losses	6	8
Fair Value	1,682	1,906
U.S. state and municipal securities [Member]
Held to maturity securities:
Amortized Cost	1,330	1,247
Gross Unrealized Gains	6	57
Gross Unrealized Losses	7	0
Fair Value	1,329	1,304
Commercial paper [Member]
Available for sale securities:
Amortized Cost	518	313
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	518	313
Available-for-sale securities, current	2,000
Foreign government agency securities [Member]
Available for sale securities:
Amortized Cost	50	51
Gross Unrealized Gains	0	0
Gross Unrealized Losses	2	1
Fair Value	48	50
Held to maturity securities:
Amortized Cost	50	50
Gross Unrealized Gains	0	0
Gross Unrealized Losses	2	1
Fair Value	48	49
Non-agency commercial mortgage-backed securities [Member]
Available for sale securities:
Amortized Cost	34	40
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	34	40
Held to maturity securities:
Amortized Cost	1,149	994
Gross Unrealized Gains	1	10
Gross Unrealized Losses	25	5
Fair Value	$ 1,125	$ 999
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member]
Held to maturity securities:
Asset-backed securities percentage	37.00%	42.00%
Collateralized Credit Card Securities [Member]
Held to maturity securities:
Asset-backed securities percentage	43.00%	40.00%
Other [Member]
Held to maturity securities:
Amortized Cost	$ 5
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Fair Value	$ 5
Corporate debt securities issued by financial services industry [Member]
Held to maturity securities:
AFS and HTM securities percentage	31.00%	41.00%
Corporate debt securities, information technology [Member]
Held to maturity securities:
AFS and HTM securities percentage	18.00%	22.00%

Investment Securities (Narrativ

Investment Securities (Narrative) (Details) - USD ($)	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Schedule of Held-to-maturity Securities [Line Items]
OTTI recognized in earnings or other comprehensive income	$ 0	$ 0
Deposits [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities pledged as collateral	898,000,000
Federal Reserve Bank Advances [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities pledged as collateral	2,400,000,000
Federal Home Loan Bank of San Francisco [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities pledged as collateral	$ 21,500,000,000

Investment Securities (Availabl

Investment Securities (Available For Sale and Held to Maturity Securities with Unrealized Losses, Aggregated by Category and Period of Continuous Unrealized Loss) (Details) $ in Millions	Sep. 30, 2018USD ($)security	Dec. 31, 2017USD ($)security
Available for sale securities:
Less than 12 months Fair Value	$ 23,326	$ 12,909
Less than 12 months Unrealized Losses	154	38
12 months or longer Fair Value	8,356	9,774
12 months or longer Unrealized Losses	144	101
Total Fair Value	31,682	22,683
Total Unrealized Losses	298	139
Held to maturity securities:
Less than 12 months Fair Value	65,742	45,180
Less than 12 months Unrealized Losses	1,331	326
12 months or longer Fair Value	40,948	24,825
12 months or longer Unrealized Losses	2,264	724
Total Fair Value	106,690	70,005
Total Unrealized Losses	3,595	1,050
Total securities with unrealized losses
Less than 12 months Fair Value	89,068	58,089
Less than 12 months Unrealized Losses	1,485	364
12 months or longer Fair Value	49,304	34,599
12 months or longer Unrealized Losses	2,408	825
Total Fair Value	138,372	92,688
Total Unrealized Losses	$ 3,893	$ 1,189
Number of available for sale securities in unrealized loss positions | security	413	251
Number of held to maturity securities in unrealized loss positions | security	1,800	938
U.S. agency mortgage-backed securities [Member]
Available for sale securities:
Less than 12 months Fair Value	$ 10,119	$ 5,696
Less than 12 months Unrealized Losses	68	21
12 months or longer Fair Value	1,988	2,548
12 months or longer Unrealized Losses	34	18
Total Fair Value	12,107	8,244
Total Unrealized Losses	102	39
Held to maturity securities:
Less than 12 months Fair Value	59,643	42,102
Less than 12 months Unrealized Losses	1,247	310
12 months or longer Fair Value	40,279	24,753
12 months or longer Unrealized Losses	2,236	724
Total Fair Value	99,922	66,855
Total Unrealized Losses	3,483	1,034
U.S. Treasury securities [Member]
Available for sale securities:
Less than 12 months Fair Value	7,770	4,625
Less than 12 months Unrealized Losses	72	11
12 months or longer Fair Value	4,374	4,875
12 months or longer Unrealized Losses	97	72
Total Fair Value	12,144	9,500
Total Unrealized Losses	169	83
Held to maturity securities:
Less than 12 months Fair Value	0	220
Less than 12 months Unrealized Losses	0	3
12 months or longer Fair Value	212	0
12 months or longer Unrealized Losses	11	0
Total Fair Value	212	220
Total Unrealized Losses	11	3
Asset-backed securities [Member]
Available for sale securities:
Less than 12 months Fair Value	1,841	904
Less than 12 months Unrealized Losses	4	3
12 months or longer Fair Value	601	424
12 months or longer Unrealized Losses	6	3
Total Fair Value	2,442	1,328
Total Unrealized Losses	10	6
Held to maturity securities:
Less than 12 months Fair Value	2,115	1,124
Less than 12 months Unrealized Losses	12	2
12 months or longer Fair Value	39	72
12 months or longer Unrealized Losses	0	0
Total Fair Value	2,154	1,196
Total Unrealized Losses	12	2
Corporate debt securities [Member]
Available for sale securities:
Less than 12 months Fair Value	3,030	736
Less than 12 months Unrealized Losses	8	1
12 months or longer Fair Value	229	120
12 months or longer Unrealized Losses	1	0
Total Fair Value	3,259	856
Total Unrealized Losses	9	1
Held to maturity securities:
Less than 12 months Fair Value	2,862	1,078
Less than 12 months Unrealized Losses	52	5
12 months or longer Fair Value	77	0
12 months or longer Unrealized Losses	3	0
Total Fair Value	2,939	1,078
Total Unrealized Losses	55	5
Certificates of deposit [Member]
Available for sale securities:
Less than 12 months Fair Value		799
Less than 12 months Unrealized Losses		1
12 months or longer Fair Value		0
12 months or longer Unrealized Losses		0
Total Fair Value		799
Total Unrealized Losses		1
U.S. agency notes [Member]
Available for sale securities:
Less than 12 months Fair Value	566	99
Less than 12 months Unrealized Losses	2	0
12 months or longer Fair Value	1,116	1,807
12 months or longer Unrealized Losses	4	8
Total Fair Value	1,682	1,906
Total Unrealized Losses	6	8
Foreign government agency securities [Member]
Available for sale securities:
Less than 12 months Fair Value	0	50
Less than 12 months Unrealized Losses	0	1
12 months or longer Fair Value	48	0
12 months or longer Unrealized Losses	2	0
Total Fair Value	48	50
Total Unrealized Losses	2	1
Held to maturity securities:
Less than 12 months Fair Value	0	49
Less than 12 months Unrealized Losses	0	1
12 months or longer Fair Value	48	0
12 months or longer Unrealized Losses	2	0
Total Fair Value	48	49
Total Unrealized Losses	2	1
U.S. state and municipal securities [Member]
Held to maturity securities:
Less than 12 months Fair Value	471
Less than 12 months Unrealized Losses	5
12 months or longer Fair Value	14
12 months or longer Unrealized Losses	2
Total Fair Value	485
Total Unrealized Losses	7
Non-agency commercial mortgage-backed securities [Member]
Held to maturity securities:
Less than 12 months Fair Value	651	607
Less than 12 months Unrealized Losses	15	5
12 months or longer Fair Value	279	0
12 months or longer Unrealized Losses	10	0
Total Fair Value	930	607
Total Unrealized Losses	$ 25	$ 5

Investment Securities (Maturiti

Investment Securities (Maturities of Securities Available for Sale and Held to Maturity) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Available for sale securities, fair value
Within 1 year	$ 10,734
After 1 year through 5 years	24,504
After 5 years through 10 years	12,321
After 10 years	9,999
Fair Value	57,558	$ 49,995
Available for sale securities, amortized cost
Within 1 year	10,762
After 1 year through 5 years	24,632
After 5 years through 10 years	12,368
After 10 years	10,014
Amortized Cost	57,776	50,029
Held to maturity securities, fair value
Within 1 year	626
After 1 year through 5 years	20,192
After 5 years through 10 years	42,367
After 10 years	72,336
Fair Value	135,521	120,373
Held to maturity securities, amortized cost
Within 1 year	628
After 1 year through 5 years	20,540
After 5 years through 10 years	43,339
After 10 years	74,445
Amortized Cost	138,952	120,926
U.S. agency mortgage-backed securities [Member]
Available for sale securities, fair value
Within 1 year	169
After 1 year through 5 years	3,669
After 5 years through 10 years	10,571
After 10 years	9,546
Fair Value	23,955	20,929
Available for sale securities, amortized cost
Amortized Cost	24,010	20,915
Held to maturity securities, fair value
Within 1 year	383
After 1 year through 5 years	14,370
After 5 years through 10 years	31,785
After 10 years	63,458
Fair Value	109,996	100,453
Held to maturity securities, amortized cost
Amortized Cost	113,453	101,197
U.S. Treasury securities [Member]
Available for sale securities, fair value
Within 1 year	5,999
After 1 year through 5 years	6,244
After 5 years through 10 years	0
After 10 years	0
Fair Value	12,243	9,500
Available for sale securities, amortized cost
Amortized Cost	12,412	9,583
Held to maturity securities, fair value
Within 1 year	0
After 1 year through 5 years	0
After 5 years through 10 years	212
After 10 years	0
Fair Value	212	220
Held to maturity securities, amortized cost
Amortized Cost	223	223
Asset-backed securities [Member]
Available for sale securities, fair value
Within 1 year	250
After 1 year through 5 years	6,968
After 5 years through 10 years	1,750
After 10 years	419
Fair Value	9,387	9,047
Available for sale securities, amortized cost
Amortized Cost	9,378	9,019
Held to maturity securities, fair value
Within 1 year	5
After 1 year through 5 years	1,611
After 5 years through 10 years	9,373
After 10 years	7,085
Fair Value	18,074	13,062
Held to maturity securities, amortized cost
Amortized Cost	17,964	12,937
Corporate debt securities [Member]
Available for sale securities, fair value
Within 1 year	1,621
After 1 year through 5 years	5,301
After 5 years through 10 years	0
After 10 years	0
Fair Value	6,922	6,169
Available for sale securities, amortized cost
Amortized Cost	6,921	6,154
Held to maturity securities, fair value
Within 1 year	238
After 1 year through 5 years	3,550
After 5 years through 10 years	743
After 10 years	0
Fair Value	4,531	4,086
Held to maturity securities, amortized cost
Amortized Cost	4,578	4,078
Certificates of deposit [Member]
Available for sale securities, fair value
Within 1 year	866
After 1 year through 5 years	1,903
After 5 years through 10 years	0
After 10 years	0
Fair Value	2,769	2,041
Available for sale securities, amortized cost
Amortized Cost	2,765	2,040
Held to maturity securities, fair value
Within 1 year	0
After 1 year through 5 years	201
After 5 years through 10 years	0
After 10 years	0
Fair Value	201	200
Held to maturity securities, amortized cost
Amortized Cost	200	200
U.S. agency notes [Member]
Available for sale securities, fair value
Within 1 year	1,311
After 1 year through 5 years	371
After 5 years through 10 years	0
After 10 years	0
Fair Value	1,682	1,906
Available for sale securities, amortized cost
Amortized Cost	1,688	1,914
U.S. state and municipal securities [Member]
Held to maturity securities, fair value
Within 1 year	0
After 1 year through 5 years	59
After 5 years through 10 years	254
After 10 years	1,016
Fair Value	1,329	1,304
Held to maturity securities, amortized cost
Amortized Cost	1,330	1,247
Commercial paper [Member]
Available for sale securities, fair value
Within 1 year	518
After 1 year through 5 years	0
After 5 years through 10 years	0
After 10 years	0
Fair Value	518	313
Available for sale securities, amortized cost
Amortized Cost	518	313
Foreign government agency securities [Member]
Available for sale securities, fair value
Within 1 year	0
After 1 year through 5 years	48
After 5 years through 10 years	0
After 10 years	0
Fair Value	48	50
Available for sale securities, amortized cost
Amortized Cost	50	51
Held to maturity securities, fair value
Within 1 year	0
After 1 year through 5 years	48
After 5 years through 10 years	0
After 10 years	0
Fair Value	48	49
Held to maturity securities, amortized cost
Amortized Cost	50	50
Non-agency commercial mortgage-backed securities [Member]
Available for sale securities, fair value
Within 1 year	0
After 1 year through 5 years	0
After 5 years through 10 years	0
After 10 years	34
Fair Value	34	40
Available for sale securities, amortized cost
Amortized Cost	34	40
Held to maturity securities, fair value
Within 1 year	0
After 1 year through 5 years	353
After 5 years through 10 years	0
After 10 years	772
Fair Value	1,125	999
Held to maturity securities, amortized cost
Amortized Cost	1,149	$ 994
Other [Member]
Held to maturity securities, fair value
Within 1 year	0
After 1 year through 5 years	0
After 5 years through 10 years	0
After 10 years	5
Fair Value	5
Held to maturity securities, amortized cost
Amortized Cost	$ 5

Investment Securities (Proceeds

Investment Securities (Proceeds and Gross Realized Gains And Losses from Sales of Securities Available for Sale) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Proceeds	$ 0	$ 288	$ 115	$ 5,773
Gross realized gains	$ 0	$ 0	$ 0	$ 7

Bank Loans and Related Allowa_3

Bank Loans and Related Allowance for Loan Losses (Composition of Bank Loans and Delinquency Analysis by Loan Segment) (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017	Jun. 30, 2018	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	$ 16,534,000,000	$ 16,448,000,000
Past due and other nonaccrual loans	56,000,000	56,000,000
Total loans	16,590,000,000	16,504,000,000
Allowance for loan losses	26,000,000	26,000,000	$ 26,000,000	$ 26,000,000	$ 26,000,000	$ 26,000,000
Total bank loans – net	16,564,000,000	16,478,000,000
Loans 90 days past due and still accruing	0	0
30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due and other nonaccrual loans	29,000,000	18,000,000
60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due and other nonaccrual loans	4,000,000	9,000,000
More Than 90 Days Past Due and Other Nonaccrual Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due and other nonaccrual loans	23,000,000	29,000,000
First Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	10,217,000,000	9,983,000,000
Past due and other nonaccrual loans	39,000,000	33,000,000
Total loans	10,256,000,000	10,016,000,000
Allowance for loan losses	17,000,000	16,000,000	17,000,000	16,000,000	17,000,000	17,000,000
Total bank loans – net	10,239,000,000	10,000,000,000
First Mortgage [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due and other nonaccrual loans	24,000,000	14,000,000
First Mortgage [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due and other nonaccrual loans	2,000,000	2,000,000
First Mortgage [Member] | More Than 90 Days Past Due and Other Nonaccrual Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due and other nonaccrual loans	13,000,000	17,000,000
HELOCs [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	1,589,000,000	1,928,000,000
Past due and other nonaccrual loans	13,000,000	15,000,000
Total loans	1,602,000,000	1,943,000,000
Allowance for loan losses	7,000,000	8,000,000	7,000,000	8,000,000	8,000,000	8,000,000
Total bank loans – net	1,595,000,000	1,935,000,000
HELOCs [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due and other nonaccrual loans	2,000,000	0
HELOCs [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due and other nonaccrual loans	1,000,000	3,000,000
HELOCs [Member] | More Than 90 Days Past Due and Other Nonaccrual Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due and other nonaccrual loans	10,000,000	12,000,000
Pledged asset lines [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	4,552,000,000	4,361,000,000
Past due and other nonaccrual loans	4,000,000	8,000,000
Total loans	4,556,000,000	4,369,000,000
Allowance for loan losses	0	0
Total bank loans – net	4,556,000,000	4,369,000,000
Pledged asset lines [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due and other nonaccrual loans	3,000,000	4,000,000
Pledged asset lines [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due and other nonaccrual loans	1,000,000	4,000,000
Pledged asset lines [Member] | More Than 90 Days Past Due and Other Nonaccrual Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due and other nonaccrual loans	0	0
Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	176,000,000	176,000,000
Past due and other nonaccrual loans	0	0
Total loans	176,000,000	176,000,000
Allowance for loan losses	2,000,000	2,000,000	$ 2,000,000	$ 2,000,000	$ 1,000,000	$ 1,000,000
Total bank loans – net	174,000,000	174,000,000
Other [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due and other nonaccrual loans	0	0
Other [Member] | 60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due and other nonaccrual loans	0	0
Other [Member] | More Than 90 Days Past Due and Other Nonaccrual Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due and other nonaccrual loans	0	0
First Mortgage and HELOC [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Unamortized premiums and discounts and direct origination costs	$ 73,000,000	$ 77,000,000
First Mortgage and HELOC [Member] | Loans, Geographic Area [Member] | California [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Concentration risk percentage	47.00%	48.00%

Bank Loans and Related Allowa_4

Bank Loans and Related Allowance for Loan Losses (Narrative) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total bank loans	$ 16,590	$ 16,504
First Mortgage and HELOC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	11,100
Adjustable Rate First Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Bank loans	$ 9,300
Percent of loans with interest-only payments	31.00%
Percent of interest only adjustable rate	64.00%
Adjustable Rate First Mortgage [Member] | Minimum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fixed rate interest rate period	3 years
Interest-only reset period	3 years
Adjustable Rate First Mortgage [Member] | Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fixed rate interest rate period	10 years
HELOCs [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan term	30 years
Initial draw period	10 years
Converting to amortizing loans period	20 years
Total bank loans	$ 1,602	$ 1,943
Percent of loan balance outstanding, borrowers paid only minimum due	54.00%
Home Equity Secured By Second Liens [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total bank loans	$ 1,300

Bank Loans and Related Allowa_5

Bank Loans and Related Allowance for Loan Losses (Changes in Allowance for Loan Losses) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	$ 26	$ 26	$ 26	$ 26
Charge-offs	0	(1)	(1)	(3)
Recoveries	1	1	2	3
Provision for loan losses	(1)	0	(1)	0
Balance at end of period	26	26	26	26
First Mortgage [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	17	17	16	17
Charge-offs	0	(1)	0	(2)
Recoveries	0	0	0	1
Provision for loan losses	0	0	1	0
Balance at end of period	17	16	17	16
HELOCs [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	7	8	8	8
Charge-offs	0	0	0	(1)
Recoveries	1	0	2	1
Provision for loan losses	(1)	0	(3)	0
Balance at end of period	7	8	7	8
Other [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	2	1	2	1
Charge-offs	0	0	(1)	0
Recoveries	0	1	0	1
Provision for loan losses	0	0	1	0
Balance at end of period	$ 2	$ 2	$ 2	$ 2

Bank Loans and Related Allowa_6

Bank Loans and Related Allowance for Loan Losses (Impaired Assets) (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructurings	$ 4	$ 11
Total impaired assets	30	42
Nonperforming Financial Instruments [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total nonperforming assets	26	31
Nonperforming Financial Instruments [Member] | Nonaccrual Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total nonperforming assets	23	28
Nonperforming Financial Instruments [Member] | Other Real Estate Owned [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total nonperforming assets	$ 3	$ 3

Bank Loans and Related Allowa_7

Bank Loans and Related Allowance for Loan Losses (Credit Quality Indicators of Bank Loan Portfolio) (Details) $ in Millions	Sep. 30, 2018USD ($)credit_rating	Dec. 31, 2017USD ($)credit_rating
Financing Receivable, Recorded Investment [Line Items]
Balance	$ 16,590	$ 16,504
First Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Balance	$ 10,256	$ 10,016
Weighted Average Updated FICO | credit_rating	776	775
Percent of Loans on Nonaccrual Status	0.07%	0.14%
First Mortgage [Member] | Origination FICO Score Below 620 [Member]
Financing Receivable, Recorded Investment [Line Items]
Balance	$ 5	$ 6
First Mortgage [Member] | Origination FICO Score 620 Through 679 [Member]
Financing Receivable, Recorded Investment [Line Items]
Balance	83	89
First Mortgage [Member] | Origination FICO Score 680 Through 739 [Member]
Financing Receivable, Recorded Investment [Line Items]
Balance	1,595	1,569
First Mortgage [Member] | Origination FICO Score 740 and Above [Member]
Financing Receivable, Recorded Investment [Line Items]
Balance	8,573	8,352
First Mortgage [Member] | Year of origination Pre 2014 [Member]
Financing Receivable, Recorded Investment [Line Items]
Balance	2,144	2,804
First Mortgage [Member] | Year of origination 2014 [Member]
Financing Receivable, Recorded Investment [Line Items]
Balance	436	530
First Mortgage [Member] | Year of origination 2015 [Member]
Financing Receivable, Recorded Investment [Line Items]
Balance	1,087	1,218
First Mortgage [Member] | Year of origination 2016 [Member]
Financing Receivable, Recorded Investment [Line Items]
Balance	2,662	2,886
First Mortgage [Member] | Year of origination 2017 [Member]
Financing Receivable, Recorded Investment [Line Items]
Balance	2,420	2,578
First Mortgage [Member] | Year of origination 2018 [Member]
Financing Receivable, Recorded Investment [Line Items]
Balance	1,507
First Mortgage [Member] | Estimated Current LTV 70% and Below [Member]
Financing Receivable, Recorded Investment [Line Items]
Balance	$ 9,383	$ 9,046
Weighted Average Updated FICO | credit_rating	777	775
Percent of Loans on Nonaccrual Status	0.05%	0.09%
First Mortgage [Member] | Estimated Current LTV Greater Than 70% through 90% [Member]
Financing Receivable, Recorded Investment [Line Items]
Balance	$ 868	$ 961
Weighted Average Updated FICO | credit_rating	771	769
Percent of Loans on Nonaccrual Status	0.24%	0.46%
First Mortgage [Member] | Estimated Current LTV Greater Than 90% through 100% [Member]
Financing Receivable, Recorded Investment [Line Items]
Balance	$ 4	$ 5
Weighted Average Updated FICO | credit_rating	713	714
Percent of Loans on Nonaccrual Status	8.70%	10.49%
First Mortgage [Member] | Estimated Current LTV Greater Than 100% [Member]
Financing Receivable, Recorded Investment [Line Items]
Balance	$ 1	$ 4
Weighted Average Updated FICO | credit_rating	742	713
Percent of Loans on Nonaccrual Status	0.00%	6.23%
First Mortgage [Member] | Origination Loan to Value Ratio 70% and Below [Member]
Financing Receivable, Recorded Investment [Line Items]
Balance	$ 7,737	$ 7,569
First Mortgage [Member] | Origination Loan to Value Ratio Greater Than 70% Through 90% [Member]
Financing Receivable, Recorded Investment [Line Items]
Balance	2,514	2,441
First Mortgage [Member] | Origination Loan to Value Ratio Greater Than 90% Through 100% [Member]
Financing Receivable, Recorded Investment [Line Items]
Balance	5	6
HELOCs [Member]
Financing Receivable, Recorded Investment [Line Items]
Balance	$ 1,602	$ 1,943
Weighted Average Updated FICO | credit_rating	770	770
Utilization Rate	31.00%	33.00%
Percent of Loans on Nonaccrual Status	0.24%	0.27%
HELOCs [Member] | Origination FICO Score Below 620 [Member]
Financing Receivable, Recorded Investment [Line Items]
Balance	$ 0	$ 1
HELOCs [Member] | Origination FICO Score 620 Through 679 [Member]
Financing Receivable, Recorded Investment [Line Items]
Balance	8	10
HELOCs [Member] | Origination FICO Score 680 Through 739 [Member]
Financing Receivable, Recorded Investment [Line Items]
Balance	305	365
HELOCs [Member] | Origination FICO Score 740 and Above [Member]
Financing Receivable, Recorded Investment [Line Items]
Balance	1,289	1,567
HELOCs [Member] | Year of origination Pre 2014 [Member]
Financing Receivable, Recorded Investment [Line Items]
Balance	1,156	1,496
HELOCs [Member] | Year of origination 2014 [Member]
Financing Receivable, Recorded Investment [Line Items]
Balance	93	116
HELOCs [Member] | Year of origination 2015 [Member]
Financing Receivable, Recorded Investment [Line Items]
Balance	110	128
HELOCs [Member] | Year of origination 2016 [Member]
Financing Receivable, Recorded Investment [Line Items]
Balance	96	111
HELOCs [Member] | Year of origination 2017 [Member]
Financing Receivable, Recorded Investment [Line Items]
Balance	101	92
HELOCs [Member] | Year of origination 2018 [Member]
Financing Receivable, Recorded Investment [Line Items]
Balance	46
HELOCs [Member] | Estimated Current LTV 70% and Below [Member]
Financing Receivable, Recorded Investment [Line Items]
Balance	$ 1,509	$ 1,773
Weighted Average Updated FICO | credit_rating	771	772
Utilization Rate	31.00%	32.00%
Percent of Loans on Nonaccrual Status	0.18%	0.18%
HELOCs [Member] | Estimated Current LTV Greater Than 70% through 90% [Member]
Financing Receivable, Recorded Investment [Line Items]
Balance	$ 84	$ 148
Weighted Average Updated FICO | credit_rating	752	755
Utilization Rate	47.00%	47.00%
Percent of Loans on Nonaccrual Status	0.90%	0.84%
HELOCs [Member] | Estimated Current LTV Greater Than 90% through 100% [Member]
Financing Receivable, Recorded Investment [Line Items]
Balance	$ 5	$ 14
Weighted Average Updated FICO | credit_rating	746	742
Utilization Rate	77.00%	64.00%
Percent of Loans on Nonaccrual Status	0.90%	2.85%
HELOCs [Member] | Estimated Current LTV Greater Than 100% [Member]
Financing Receivable, Recorded Investment [Line Items]
Balance	$ 4	$ 8
Weighted Average Updated FICO | credit_rating	704	718
Utilization Rate	81.00%	72.00%
Percent of Loans on Nonaccrual Status	5.28%	4.91%
HELOCs [Member] | Origination Loan to Value Ratio 70% and Below [Member]
Financing Receivable, Recorded Investment [Line Items]
Balance	$ 1,127	$ 1,360
HELOCs [Member] | Origination Loan to Value Ratio Greater Than 70% Through 90% [Member]
Financing Receivable, Recorded Investment [Line Items]
Balance	468	574
HELOCs [Member] | Origination Loan to Value Ratio Greater Than 90% Through 100% [Member]
Financing Receivable, Recorded Investment [Line Items]
Balance	7	9
Pledged asset lines [Member]
Financing Receivable, Recorded Investment [Line Items]
Balance	4,556	4,369
Pledged asset lines [Member] | Weighted Average Loan to Value Ratio =70% [Member]
Financing Receivable, Recorded Investment [Line Items]
Balance	$ 4,556	$ 4,369
Weighted Average Updated FICO | credit_rating	766	765
Utilization Rate	36.00%	41.00%
Percent of Loans on Nonaccrual Status	0.00%	0.00%

Bank Loans and Related Allowa_8

Bank Loans and Related Allowance for Loan Losses (Convert to Amortizing Loans) (Details) - HELOCs [Member] $ in Millions	Sep. 30, 2018USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Converted to an amortizing loan by period end	$ 640
Within 1 year	186
1 year – 3 years	133
3 years – 5 years	163
5 years	480
Total	$ 1,602

Variable Interest Entities (Agg

Variable Interest Entities (Aggregate Assets, Liabilities and Maximum Exposure to Loss) (Details) - Variable Interest Entity, Not Primary Beneficiary [Member] - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Variable Interest Entity [Line Items]
Aggregate assets	$ 415	$ 373
Aggregate liabilities	204	203
Maximum exposure to loss	463	429
LIHTC Investments [Member]
Variable Interest Entity [Line Items]
Aggregate assets	347	304
Aggregate liabilities	204	203
Maximum exposure to loss	347	304
Other CRA Investments [Member]
Variable Interest Entity [Line Items]
Aggregate assets	68	69
Aggregate liabilities	0	0
Maximum exposure to loss	$ 116	$ 125

Variable Interest Entities (Nar

Variable Interest Entities (Narrative) (Details) - LIHTC Investments [Member]	9 Months Ended
	Sep. 30, 2018
Minimum [Member]
Variable Interest Entity [Line Items]
Commitment, expected payment date	2,018
Maximum [Member]
Variable Interest Entity [Line Items]
Commitment, expected payment date	2,021

Bank Deposits (Details)

Bank Deposits (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Interest-bearing deposits:
Deposits swept from brokerage accounts	$ 194,337	$ 148,212
Checking	12,230	13,388
Savings and other	6,153	7,264
Total interest-bearing deposits	212,720	168,864
Non-interest-bearing deposits	688	792
Total bank deposits	$ 213,408	$ 169,656

Borrowings (Long-term Debt Incl

Borrowings (Long-term Debt Including Unamortized Debt Discounts and Premiums) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Senior Notes	$ 5,781	$ 4,731
Unamortized discount — net	(13)	(14)
Debt issuance costs	(33)	(25)
Total long-term debt	$ 5,790	4,753
Lease term	20 years
Senior Notes [Member] | Senior Notes Due March 2018 [Member]
Debt Instrument [Line Items]
Fixed Interest Rate	1.50%
Senior Notes	$ 0	625
Senior Notes [Member] | Senior Notes Due July 2018 [Member]
Debt Instrument [Line Items]
Fixed Interest Rate	2.20%
Senior Notes	$ 0	275
Senior Notes [Member] | Senior Notes Due 2020 [Member]
Debt Instrument [Line Items]
Fixed Interest Rate	4.45%
Senior Notes	$ 700	700
Senior Notes [Member] | Senior Notes Due 2021 [Member]
Debt Instrument [Line Items]
Fixed Interest Rate	3.25%
Senior Notes	$ 600	0
Senior Notes [Member] | Senior Notes Due 2022 [Member]
Debt Instrument [Line Items]
Fixed Interest Rate	3.225%
Senior Notes	$ 256	256
Senior Notes [Member] | Senior Notes Due 2023 [Member]
Debt Instrument [Line Items]
Fixed Interest Rate	2.65%
Senior Notes	$ 800	800
Senior Notes [Member] | Senior Notes Due March 2025 [Member]
Debt Instrument [Line Items]
Fixed Interest Rate	3.00%
Senior Notes	$ 375	375
Senior Notes [Member] | Senior Notes Due May 2025 [Member]
Debt Instrument [Line Items]
Fixed Interest Rate	3.85%
Senior Notes	$ 750	0
Senior Notes [Member] | Senior Notes Due 2026 [Member]
Debt Instrument [Line Items]
Fixed Interest Rate	3.45%
Senior Notes	$ 350	350
Senior Notes [Member] | Senior Notes Due 2027 [Member]
Debt Instrument [Line Items]
Fixed Interest Rate	3.20%
Senior Notes	$ 650	650
Senior Notes [Member] | Senior Notes Due 2028 [Member]
Debt Instrument [Line Items]
Fixed Interest Rate	3.20%
Senior Notes	$ 700	700
Senior Notes [Member] | Floating Rate Senior Notes Due 2021 [Member]
Debt Instrument [Line Items]
Senior Notes	$ 600	0
Senior Notes [Member] | Floating Rate Senior Notes Due 2021 [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread rate	0.32%
Finance lease obligation [Member]
Debt Instrument [Line Items]
Fixed Interest Rate	5.45%
Finance lease obligation	$ 55	$ 61

Borrowings (Annual Maturities o

Borrowings (Annual Maturities on Long-term Debt Outstanding) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Debt Disclosure [Abstract]
2,018	$ 2
2,019	8
2,020	709
2,021	1,209
2,022	266
Thereafter	3,642
Total maturities	5,836
Unamortized discount, net	(13)	$ (14)
Debt issuance costs	(33)	(25)
Total long-term debt	$ 5,790	$ 4,753

Borrowings (Narrative) (Details

Borrowings (Narrative) (Details) - Federal Home Loan Bank Advances [Member] - USD ($)	Sep. 30, 2018	Dec. 31, 2017
Line of Credit Facility [Line Items]
FHLB stock	$ 32,000,000	$ 405,000,000
Secured Credit Facility [Member]
Line of Credit Facility [Line Items]
Borrowings on line of credit	30,000,000,000	15,000,000,000
Line of credit facility, current borrowing capacity	$ 0	$ 32,300,000,000

Commitments and Contingencies_2

Commitments and Contingencies (Commitments to Extend/Purchase) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commitments to purchase			$ 11,383		$ 10,368
First Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased during period	$ 491	$ 696	1,600	$ 2,000
Commitments to purchase			355		308
HELOCs [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchased during period	104	$ 115	311	$ 344
Home Equity Loans and Lines of Credit Pledged Asset Lines and Other Lines of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commitments to extend credit related to unused HELOCs, PALs, and other lines of credit	$ 11,028		$ 11,028		$ 10,060

Commitments and Contingencies_3

Commitments and Contingencies (Details) - USD ($)	Sep. 30, 2018	Aug. 28, 2008
Loss Contingencies [Line Items]
Aggregate face amount of letter of credit agreements	$ 225,000,000
Performance Guarantee [Member]
Loss Contingencies [Line Items]
Liability for guarantees	0
Margin Requirements [Member]
Loss Contingencies [Line Items]
Funds drawn under LOC's	$ 0
Bond Market Fund Litigation [Member] | CMOs and Mortgage-backed Securities [Member]
Loss Contingencies [Line Items]
Alleged minimum percentage of fund assets invested in CMOs and mortgage-backed securities without obtaining shareholder vote, more than		25.00%

Financial Instruments Subject_3

Financial Instruments Subject to Off-Balance Sheet Credit Risk (Narrative) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Securities Financing Transaction, Fair Value [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fair value of borrowed securities from other broker-dealers to fulfill short sales by clients	$ 338	$ 215

Financial Instruments Subject_4

Financial Instruments Subject to Off-Balance Sheet Credit Risk (Offsetting Assets and Liabilities) (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Resale agreements
Gross Assets	$ 4,424	$ 6,596
Gross Amounts Offset in the Condensed Consolidated Balance Sheets	0	0
Net Amounts Presented in the Condensed Consolidated Balance Sheets	4,424	6,596
Counterparty Offsetting	0	0
Collateral	(4,424)	(6,596)
Net Amount	0	0
Securities borrowed
Gross Assets	346	222
Gross Amounts Offset in the Condensed Consolidated Balance Sheets	0	0
Net Amounts Presented in the Condensed Consolidated Balance Sheets	346	222
Counterparty Offsetting	(316)	(199)
Collateral	(30)	(22)
Net Amount	0	1
Total Gross Assets	4,770	6,818
Total Assets, Gross Amounts Offset in the Condensed Consolidated Balance Sheets	0	0
Total Assets, Net Amounts Presented in the Condensed Consolidated Balance Sheets	4,770	6,818
Total Assets, Gross Amounts Not Offset in the Consolidated Balance Sheet, Counterparty Offsetting	(316)	(199)
Total Assets, Gross Amounts Not Offset in the Consolidated Balance Sheet, Collateral	(4,454)	(6,618)
Total Assets, Net Amount	0	1
Securities loaned
Gross Liabilities	1,062	966
Gross Amounts Offset in the Condensed Consolidated Balance Sheets	0	0
Net Amounts Presented in the Condensed Consolidated Balance Sheets	1,062	966
Counterparty Offsetting	(316)	(199)
Collateral	(652)	(670)
Net Amount	94	97
Total Gross Liabilities	1,062	966
Total Liabilities, Net Amounts Presented in the Consolidated Balance Sheet	1,062	966
Total Liabilities, Gross Amounts Not Offset in the Consolidated Balance Sheet, Counterparty Offsetting	(316)	(199)
Total Liabilities, Gross Amounts Not Offset in the Consolidated Balance Sheet, Collateral	(652)	(670)
Total Liabilities, Net Amount	94	97
Offsetting Assets [Line Items]
Fair value of client securities available to be pledged	$ 28,806	$ 25,905
Resale And Repurchase Agreements [Member]
Offsetting Assets [Line Items]
Percentage of collateral to related assets	102.00%	102.00%
Fair value of client securities available to be pledged	$ 4,500	$ 6,700

Financial Instruments Subject_5

Financial Instruments Subject to Off-Balance Sheet Credit Risk (Summary of the Fair Value of Client Securities Available to Utilize as Collateral and Amounts Pledged) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Securities Financing Transaction [Line Items]
Fair value of client securities available to be pledged	$ 28,806	$ 25,905
Total collateral pledged	5,831	5,075
Fulfillment of Requirements with the Options Clearing Corporation [Member]
Securities Financing Transaction [Line Items]
Total collateral pledged	3,036	2,280
Fulfillment of Client Short Sales [Member]
Securities Financing Transaction [Line Items]
Total collateral pledged	1,923	2,011
Securities Lending to Other Broker-Dealers [Member]
Securities Financing Transaction [Line Items]
Total collateral pledged	872	784
Fully Paid Client Securities [Member]
Securities Financing Transaction [Line Items]
Total collateral pledged	$ 88	$ 78

Fair Values of Assets and Lia_3

Fair Values of Assets and Liabilities (Fair Value Hierarchy for Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Other securities owned	$ 500	$ 539
Available for sale securities	57,558	49,995
Fair Value, Measurements, Recurring [Member] | Fair Value [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	2,540	2,727
Investments segregated and on deposit for regulatory purposes	1,950	5,856
Other securities owned	500	539
Available for sale securities	57,558	49,995
Total	62,548	59,117
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Money market funds [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	552	2,727
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Commercial paper [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	1,988
Available for sale securities	518	313
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Certificates of deposit [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Investments segregated and on deposit for regulatory purposes	1,950	2,198
Available for sale securities	2,769	2,041
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | U.S. Government securities [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Investments segregated and on deposit for regulatory purposes		3,658
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Equity and bond mutual funds [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Other securities owned	394	318
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Schwab Funds money market funds [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Other securities owned	21	135
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | State and municipal debt obligations [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Other securities owned	44	52
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Equity, U.S. Government and corporate debt, and other securities [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Other securities owned	41	34
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | U.S. agency mortgage-backed securities [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	23,955	20,929
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | U.S. Treasury securities [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	12,243	9,500
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Asset-backed securities [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	9,387	9,047
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Corporate debt securities [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	6,922	6,169
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | U.S. agency notes [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	1,682	1,906
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Foreign government agency securities [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	48	50
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Non-agency commercial mortgage-backed securities [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	34	40
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 1 [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	552	2,727
Investments segregated and on deposit for regulatory purposes	0	0
Other securities owned	418	455
Available for sale securities	0	0
Total	970	3,182
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 1 [Member] | Money market funds [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	552	2,727
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 1 [Member] | Commercial paper [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0
Available for sale securities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 1 [Member] | Certificates of deposit [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Investments segregated and on deposit for regulatory purposes	0	0
Available for sale securities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 1 [Member] | U.S. Government securities [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Investments segregated and on deposit for regulatory purposes		0
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 1 [Member] | Equity and bond mutual funds [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Other securities owned	394	318
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 1 [Member] | Schwab Funds money market funds [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Other securities owned	21	135
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 1 [Member] | State and municipal debt obligations [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Other securities owned	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 1 [Member] | Equity, U.S. Government and corporate debt, and other securities [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Other securities owned	3	2
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 1 [Member] | U.S. agency mortgage-backed securities [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 1 [Member] | U.S. Treasury securities [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 1 [Member] | Asset-backed securities [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 1 [Member] | Corporate debt securities [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 1 [Member] | U.S. agency notes [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 1 [Member] | Foreign government agency securities [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 1 [Member] | Non-agency commercial mortgage-backed securities [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 2 [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	1,988	0
Investments segregated and on deposit for regulatory purposes	1,950	5,856
Other securities owned	82	84
Available for sale securities	57,558	49,995
Total	61,578	55,935
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 2 [Member] | Money market funds [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 2 [Member] | Commercial paper [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	1,988
Available for sale securities	518	313
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 2 [Member] | Certificates of deposit [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Investments segregated and on deposit for regulatory purposes	1,950	2,198
Available for sale securities	2,769	2,041
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 2 [Member] | U.S. Government securities [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Investments segregated and on deposit for regulatory purposes		3,658
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 2 [Member] | Equity and bond mutual funds [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Other securities owned	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 2 [Member] | Schwab Funds money market funds [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Other securities owned	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 2 [Member] | State and municipal debt obligations [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Other securities owned	44	52
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 2 [Member] | Equity, U.S. Government and corporate debt, and other securities [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Other securities owned	38	32
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 2 [Member] | U.S. agency mortgage-backed securities [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	23,955	20,929
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 2 [Member] | U.S. Treasury securities [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	12,243	9,500
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 2 [Member] | Asset-backed securities [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	9,387	9,047
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 2 [Member] | Corporate debt securities [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	6,922	6,169
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 2 [Member] | U.S. agency notes [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	1,682	1,906
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 2 [Member] | Foreign government agency securities [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	48	50
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 2 [Member] | Non-agency commercial mortgage-backed securities [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	34	40
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 3 [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Investments segregated and on deposit for regulatory purposes	0	0
Other securities owned	0	0
Available for sale securities	0	0
Total	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 3 [Member] | Money market funds [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 3 [Member] | Commercial paper [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0
Available for sale securities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 3 [Member] | Certificates of deposit [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Investments segregated and on deposit for regulatory purposes	0	0
Available for sale securities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 3 [Member] | U.S. Government securities [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Investments segregated and on deposit for regulatory purposes		0
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 3 [Member] | Equity and bond mutual funds [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Other securities owned	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 3 [Member] | Schwab Funds money market funds [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Other securities owned	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 3 [Member] | State and municipal debt obligations [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Other securities owned	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 3 [Member] | Equity, U.S. Government and corporate debt, and other securities [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Other securities owned	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 3 [Member] | U.S. agency mortgage-backed securities [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 3 [Member] | U.S. Treasury securities [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 3 [Member] | Asset-backed securities [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 3 [Member] | Corporate debt securities [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 3 [Member] | U.S. agency notes [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 3 [Member] | Foreign government agency securities [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 3 [Member] | Non-agency commercial mortgage-backed securities [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	$ 0	$ 0

Fair Values of Assets and Lia_4

Fair Values of Assets and Liabilities (Fair Value of Other Financial Instruments) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Assets
Held to maturity securities	$ 135,521	$ 120,373
Carrying Amount [Member]
Assets
Cash and cash equivalents	19,290	11,490
Cash and investments segregated and on deposit for regulatory purposes	6,526	9,277
Receivables from brokers, dealers, and clearing organizations	798	649
Receivables from brokerage clients — net	22,402	20,568
Held to maturity securities	138,952	120,926
Bank loans – net	16,564	16,478
Other assets	463	781
Total	204,995	180,169
Liabilities
Bank deposits	213,408	169,656
Payables to brokers, dealers, and clearing organizations	1,522	1,287
Payables to brokerage clients	27,851	31,243
Accrued expenses and other liabilities	1,177	1,463
Short-term borrowings		15,000
Long-term debt	5,790	4,753
Total	249,748	223,402
Carrying Amount [Member] | First Mortgage [Member]
Assets
Bank loans – net	10,239	10,000
Carrying Amount [Member] | HELOCs [Member]
Assets
Bank loans – net	1,595	1,935
Carrying Amount [Member] | Pledged asset lines [Member]
Assets
Bank loans – net	4,556	4,369
Carrying Amount [Member] | Other [Member]
Assets
Bank loans – net	174	174
Carrying Amount [Member] | U.S. agency mortgage-backed securities [Member]
Assets
Held to maturity securities	113,453	101,197
Carrying Amount [Member] | Asset-backed securities [Member]
Assets
Held to maturity securities	17,964	12,937
Carrying Amount [Member] | Corporate debt securities [Member]
Assets
Held to maturity securities	4,578	4,078
Carrying Amount [Member] | U.S. state and municipal securities [Member]
Assets
Held to maturity securities	1,330	1,247
Carrying Amount [Member] | Non-agency commercial mortgage-backed securities [Member]
Assets
Held to maturity securities	1,149	994
Carrying Amount [Member] | U.S. Treasury securities [Member]
Assets
Held to maturity securities	223	223
Carrying Amount [Member] | Certificates of deposit [Member]
Assets
Held to maturity securities	200	200
Carrying Amount [Member] | Foreign government agency securities [Member]
Assets
Held to maturity securities	50	50
Carrying Amount [Member] | Other [Member]
Assets
Held to maturity securities	5
Portion at Other than Fair Value Measurement [Member]
Assets
Cash and cash equivalents	19,290	11,490
Cash and investments segregated and on deposit for regulatory purposes	6,526	9,277
Receivables from brokers, dealers, and clearing organizations	798	649
Receivables from brokerage clients — net	22,402	20,568
Held to maturity securities	135,521	120,373
Bank loans – net	16,357	16,485
Other assets	463	781
Total	201,357	179,623
Liabilities
Bank deposits	213,408	169,656
Payables to brokers, dealers, and clearing organizations	1,522	1,287
Payables to brokerage clients	27,851	31,243
Accrued expenses and other liabilities	1,177	1,463
Short-term borrowings		15,000
Long-term debt	5,687	4,811
Total	249,645	223,460
Portion at Other than Fair Value Measurement [Member] | First Mortgage [Member]
Assets
Bank loans – net	9,963	9,917
Portion at Other than Fair Value Measurement [Member] | HELOCs [Member]
Assets
Bank loans – net	1,664	2,025
Portion at Other than Fair Value Measurement [Member] | Pledged asset lines [Member]
Assets
Bank loans – net	4,556	4,369
Portion at Other than Fair Value Measurement [Member] | Other [Member]
Assets
Bank loans – net	174	174
Portion at Other than Fair Value Measurement [Member] | U.S. agency mortgage-backed securities [Member]
Assets
Held to maturity securities	109,996	100,453
Portion at Other than Fair Value Measurement [Member] | Asset-backed securities [Member]
Assets
Held to maturity securities	18,074	13,062
Portion at Other than Fair Value Measurement [Member] | Corporate debt securities [Member]
Assets
Held to maturity securities	4,531	4,086
Portion at Other than Fair Value Measurement [Member] | U.S. state and municipal securities [Member]
Assets
Held to maturity securities	1,329	1,304
Portion at Other than Fair Value Measurement [Member] | Non-agency commercial mortgage-backed securities [Member]
Assets
Held to maturity securities	1,125	999
Portion at Other than Fair Value Measurement [Member] | U.S. Treasury securities [Member]
Assets
Held to maturity securities	212	220
Portion at Other than Fair Value Measurement [Member] | Certificates of deposit [Member]
Assets
Held to maturity securities	201	200
Portion at Other than Fair Value Measurement [Member] | Foreign government agency securities [Member]
Assets
Held to maturity securities	48	49
Portion at Other than Fair Value Measurement [Member] | Other [Member]
Assets
Held to maturity securities	5
Portion at Other than Fair Value Measurement [Member] | Level 1 [Member]
Assets
Cash and cash equivalents	0	0
Cash and investments segregated and on deposit for regulatory purposes	0	0
Receivables from brokers, dealers, and clearing organizations	0	0
Receivables from brokerage clients — net	0	0
Held to maturity securities	0	0
Bank loans – net	0	0
Other assets	0	0
Total	0	0
Liabilities
Bank deposits	0	0
Payables to brokers, dealers, and clearing organizations	0	0
Payables to brokerage clients	0	0
Accrued expenses and other liabilities	0	0
Short-term borrowings		0
Long-term debt	0	0
Total	0	0
Portion at Other than Fair Value Measurement [Member] | Level 1 [Member] | First Mortgage [Member]
Assets
Bank loans – net	0	0
Portion at Other than Fair Value Measurement [Member] | Level 1 [Member] | HELOCs [Member]
Assets
Bank loans – net	0	0
Portion at Other than Fair Value Measurement [Member] | Level 1 [Member] | Pledged asset lines [Member]
Assets
Bank loans – net	0	0
Portion at Other than Fair Value Measurement [Member] | Level 1 [Member] | Other [Member]
Assets
Bank loans – net	0	0
Portion at Other than Fair Value Measurement [Member] | Level 1 [Member] | U.S. agency mortgage-backed securities [Member]
Assets
Held to maturity securities	0	0
Portion at Other than Fair Value Measurement [Member] | Level 1 [Member] | Asset-backed securities [Member]
Assets
Held to maturity securities	0	0
Portion at Other than Fair Value Measurement [Member] | Level 1 [Member] | Corporate debt securities [Member]
Assets
Held to maturity securities	0	0
Portion at Other than Fair Value Measurement [Member] | Level 1 [Member] | U.S. state and municipal securities [Member]
Assets
Held to maturity securities	0	0
Portion at Other than Fair Value Measurement [Member] | Level 1 [Member] | Non-agency commercial mortgage-backed securities [Member]
Assets
Held to maturity securities	0	0
Portion at Other than Fair Value Measurement [Member] | Level 1 [Member] | U.S. Treasury securities [Member]
Assets
Held to maturity securities	0	0
Portion at Other than Fair Value Measurement [Member] | Level 1 [Member] | Certificates of deposit [Member]
Assets
Held to maturity securities	0	0
Portion at Other than Fair Value Measurement [Member] | Level 1 [Member] | Foreign government agency securities [Member]
Assets
Held to maturity securities	0	0
Portion at Other than Fair Value Measurement [Member] | Level 1 [Member] | Other [Member]
Assets
Held to maturity securities	0
Portion at Other than Fair Value Measurement [Member] | Level 2 [Member]
Assets
Cash and cash equivalents	19,290	11,490
Cash and investments segregated and on deposit for regulatory purposes	6,526	9,277
Receivables from brokers, dealers, and clearing organizations	798	649
Receivables from brokerage clients — net	22,402	20,568
Held to maturity securities	135,521	120,373
Bank loans – net	16,357	16,485
Other assets	463	781
Total	201,357	179,623
Liabilities
Bank deposits	213,408	169,656
Payables to brokers, dealers, and clearing organizations	1,522	1,287
Payables to brokerage clients	27,851	31,243
Accrued expenses and other liabilities	1,177	1,463
Short-term borrowings		15,000
Long-term debt	5,687	4,811
Total	249,645	223,460
Portion at Other than Fair Value Measurement [Member] | Level 2 [Member] | First Mortgage [Member]
Assets
Bank loans – net	9,963	9,917
Portion at Other than Fair Value Measurement [Member] | Level 2 [Member] | HELOCs [Member]
Assets
Bank loans – net	1,664	2,025
Portion at Other than Fair Value Measurement [Member] | Level 2 [Member] | Pledged asset lines [Member]
Assets
Bank loans – net	4,556	4,369
Portion at Other than Fair Value Measurement [Member] | Level 2 [Member] | Other [Member]
Assets
Bank loans – net	174	174
Portion at Other than Fair Value Measurement [Member] | Level 2 [Member] | U.S. agency mortgage-backed securities [Member]
Assets
Held to maturity securities	109,996	100,453
Portion at Other than Fair Value Measurement [Member] | Level 2 [Member] | Asset-backed securities [Member]
Assets
Held to maturity securities	18,074	13,062
Portion at Other than Fair Value Measurement [Member] | Level 2 [Member] | Corporate debt securities [Member]
Assets
Held to maturity securities	4,531	4,086
Portion at Other than Fair Value Measurement [Member] | Level 2 [Member] | U.S. state and municipal securities [Member]
Assets
Held to maturity securities	1,329	1,304
Portion at Other than Fair Value Measurement [Member] | Level 2 [Member] | Non-agency commercial mortgage-backed securities [Member]
Assets
Held to maturity securities	1,125	999
Portion at Other than Fair Value Measurement [Member] | Level 2 [Member] | U.S. Treasury securities [Member]
Assets
Held to maturity securities	212	220
Portion at Other than Fair Value Measurement [Member] | Level 2 [Member] | Certificates of deposit [Member]
Assets
Held to maturity securities	201	200
Portion at Other than Fair Value Measurement [Member] | Level 2 [Member] | Foreign government agency securities [Member]
Assets
Held to maturity securities	48	49
Portion at Other than Fair Value Measurement [Member] | Level 2 [Member] | Other [Member]
Assets
Held to maturity securities	5
Portion at Other than Fair Value Measurement [Member] | Level 3 [Member]
Assets
Cash and cash equivalents	0	0
Cash and investments segregated and on deposit for regulatory purposes	0	0
Receivables from brokers, dealers, and clearing organizations	0	0
Receivables from brokerage clients — net	0	0
Held to maturity securities	0	0
Bank loans – net	0	0
Other assets	0	0
Total	0	0
Liabilities
Bank deposits	0	0
Payables to brokers, dealers, and clearing organizations	0	0
Payables to brokerage clients	0	0
Accrued expenses and other liabilities	0	0
Short-term borrowings		0
Long-term debt	0	0
Total	0	0
Portion at Other than Fair Value Measurement [Member] | Level 3 [Member] | First Mortgage [Member]
Assets
Bank loans – net	0	0
Portion at Other than Fair Value Measurement [Member] | Level 3 [Member] | HELOCs [Member]
Assets
Bank loans – net	0	0
Portion at Other than Fair Value Measurement [Member] | Level 3 [Member] | Pledged asset lines [Member]
Assets
Bank loans – net	0	0
Portion at Other than Fair Value Measurement [Member] | Level 3 [Member] | Other [Member]
Assets
Bank loans – net	0	0
Portion at Other than Fair Value Measurement [Member] | Level 3 [Member] | U.S. agency mortgage-backed securities [Member]
Assets
Held to maturity securities	0	0
Portion at Other than Fair Value Measurement [Member] | Level 3 [Member] | Asset-backed securities [Member]
Assets
Held to maturity securities	0	0
Portion at Other than Fair Value Measurement [Member] | Level 3 [Member] | Corporate debt securities [Member]
Assets
Held to maturity securities	0	0
Portion at Other than Fair Value Measurement [Member] | Level 3 [Member] | U.S. state and municipal securities [Member]
Assets
Held to maturity securities	0	0
Portion at Other than Fair Value Measurement [Member] | Level 3 [Member] | Non-agency commercial mortgage-backed securities [Member]
Assets
Held to maturity securities	0	0
Portion at Other than Fair Value Measurement [Member] | Level 3 [Member] | U.S. Treasury securities [Member]
Assets
Held to maturity securities	0	0
Portion at Other than Fair Value Measurement [Member] | Level 3 [Member] | Certificates of deposit [Member]
Assets
Held to maturity securities	0	0
Portion at Other than Fair Value Measurement [Member] | Level 3 [Member] | Foreign government agency securities [Member]
Assets
Held to maturity securities	0	$ 0
Portion at Other than Fair Value Measurement [Member] | Level 3 [Member] | Other [Member]
Assets
Held to maturity securities	$ 0

Stockholders' Equity (Preferred

Stockholders' Equity (Preferred Stock Issued and Outstanding) (Details) - USD ($) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Class of Stock [Line Items]
Shares issued (in shares)	1,761,000	1,761,000
Shares outstanding (in shares)	1,761,000	1,761,000
Carrying Value	$ 2,793	$ 2,793
Series C Preferred Stock [Member]
Class of Stock [Line Items]
Shares issued (in shares)	600,000	600,000
Shares outstanding (in shares)	600,000	600,000
Liquidation preference per share (USD per share)	$ 1,000
Carrying Value	$ 585	$ 585
Dividend Rate in Effect	6.00%
Series D Preferred Stock [Member]
Class of Stock [Line Items]
Shares issued (in shares)	750,000	750,000
Shares outstanding (in shares)	750,000	750,000
Liquidation preference per share (USD per share)	$ 1,000
Carrying Value	$ 728	$ 728
Dividend Rate in Effect	5.95%
Series A Preferred Stock [Member]
Class of Stock [Line Items]
Shares issued (in shares)	400,000	400,000
Shares outstanding (in shares)	400,000	400,000
Liquidation preference per share (USD per share)	$ 1,000
Carrying Value	$ 397	$ 397
Dividend Rate in Effect	7.00%
Series A Preferred Stock [Member] | LIBOR [Member]
Class of Stock [Line Items]
Floating Annual Rate	4.82%
Series E Preferred Stock [Member]
Class of Stock [Line Items]
Shares issued (in shares)	6,000	6,000
Shares outstanding (in shares)	6,000	6,000
Liquidation preference per share (USD per share)	$ 100,000
Carrying Value	$ 591	$ 591
Dividend Rate in Effect	4.625%
Series E Preferred Stock [Member] | LIBOR [Member]
Class of Stock [Line Items]
Floating Annual Rate	3.315%
Series F Preferred Stock [Member]
Class of Stock [Line Items]
Shares issued (in shares)	5,000	5,000
Shares outstanding (in shares)	5,000	5,000
Liquidation preference per share (USD per share)	$ 100,000
Carrying Value	$ 492	$ 492
Dividend Rate in Effect	5.00%
Series F Preferred Stock [Member] | LIBOR [Member]
Class of Stock [Line Items]
Floating Annual Rate	2.575%

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Components of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Other comprehensive income (loss) before tax
Net unrealized gain (loss)	$ (43)	$ 0	$ (184)	$ 81
Reclassification of net unrealized loss on securities transferred to held to maturity	0	0	0	227
Other reclassifications included in other revenue	0	0	0	(7)
Change in net unrealized gain (loss) on held to maturity securities:
Reclassification of net unrealized loss on securities transferred from available for sale	0	0	0	(227)
Amortization of amounts previously recorded upon transfer from available for sale	8	10	26	21
Other	0	0	0	(3)
Other comprehensive income (loss), before tax	(35)	10	(158)	92
Tax Effect
Net unrealized gain (loss)	11	0	45	(30)
Reclassification of net unrealized loss on securities transferred to held to maturity			0	(85)
Other reclassifications included in other revenue			0	3
Change in net unrealized gain (loss) on held to maturity securities:
Reclassification of net unrealized loss on securities transferred from available for sale (1)			0	85
Amortization of amounts previously recorded upon transfer from available for sale	(2)	(4)	(6)	(9)
Other			0	1
Other comprehensive income (loss)	9	(4)	39	(35)
Net of Tax
Net unrealized gain (loss)	(32)	0	(139)	51
Reclassification of net unrealized loss on securities transferred to held to maturity			0	142
Other reclassifications included in other revenue			0	(4)
Change in net unrealized gain (loss) on held to maturity securities:
Reclassification of net unrealized loss on securities transferred from available for sale			0	(142)
Amortization of amounts previously recorded upon transfer from available for sale	6	6	20	12
Other			0	(2)
Other comprehensive income (loss), net of tax	$ (26)	$ 6	$ (119)	$ 57

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Income (Accumulated Other Comprehensive Income Balances) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Accumulated Other Comprehensive Income
Beginning Balance			$ (152)	$ (163)
Other net changes	$ (26)	$ 6	(119)	57
Ending Balance	$ (304)	$ (106)	(304)	(106)
Net unrealized gain (loss) on available for sale securities [Member]
Accumulated Other Comprehensive Income
Other net changes			(139)	51
Reclassification of net unrealized loss on securities transferred to held to maturity [Member]
Accumulated Other Comprehensive Income
Other net changes				142
Other reclassifications in other revenue, available for sale securities [Member]
Accumulated Other Comprehensive Income
Other net changes				(4)
Reclassification of net unrealized loss on securities transferred from available for sale [Member]
Accumulated Other Comprehensive Income
Other net changes				(142)
Amortization of amounts previously recorded upon transfer to held to maturity from available for sale [Member]
Accumulated Other Comprehensive Income
Other net changes			20	12
Other [Member]
Accumulated Other Comprehensive Income
Other net changes				$ (2)
Adoption of accounting standards [Member] | ASU 2018-02 [Member]
Accumulated Other Comprehensive Income
Other net changes			$ (33)

Taxes on Income (Details)

Taxes on Income (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Effective tax rate	24.30%		34.60%	23.30%	34.90%
One-time non-cash charge to taxes on income		$ 46
ASU 2018-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings						$ 33

Earnings Per Common Share (Deta

Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Net income		$ 923	$ 618	$ 2,572	$ 1,757	[1]
Preferred stock dividends and other	[2]	(38)	(43)	(128)	(127)
Net Income Available to Common Stockholders		$ 885	$ 575	$ 2,444	$ 1,630
Weighted-average common shares outstanding — basic (shares)		1,351	1,339	1,349	1,338
Common stock equivalent shares related to stock incentive plans (shares)		13	14	14	14
Weighted-average common shares outstanding — diluted (shares)	[3]	1,364	1,353	1,363	1,352
Basic EPS (USD per share)		$ 0.66	$ 0.43	$ 1.81	$ 1.22
Diluted EPS (USD per share)		$ 0.65	$ 0.42	$ 1.79	$ 1.21
Antidilutive stock options and restricted stock awards excluded from the calculation of diluted EPS (in shares)		11	9	12	10
[1]	Adjusted for the retrospective adoption of ASU 2016-18. See Note 2.
[2]	Includes preferred stock dividends and undistributed earnings and dividends allocated to non-vested restricted stock units.
[3]	Antidilutive stock options and restricted stock units excluded from the calculation of diluted EPS totaled 11 million and 9 million shares for the third quarters of 2018 and 2017, respectively, and 12 million and 10 million shares for the first nine months of 2018 and 2017, respectively.

Regulatory Requirements (Regula

Regulatory Requirements (Regulatory Capital and Ratios) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
CSC [Member]
Common Equity Tier 1 Risk-Based Capital
Actual Amount	$ 17,025	$ 14,630
Actual Ratio	19.60%	19.30%
Minimum Capital Requirement Amount	$ 3,907	$ 3,414
Minimum Capital Requirement Ratio	4.50%	4.50%
Tier 1 Risk-Based Capital
Actual Amount	$ 19,818	$ 17,423
Actual Ratio	22.80%	23.00%
Minimum Capital Requirement Amount	$ 5,210	$ 4,552
Minimum Capital Requirement Ratio	6.00%	6.00%
Total Risk-Based Capital
Actual Amount	$ 19,846	$ 17,452
Actual Ratio	22.90%	23.00%
Minimum Capital Requirement Amount	$ 6,946	$ 6,069
Minimum Capital Requirement Ratio	8.00%	8.00%
Tier 1 Leverage
Actual Amount	$ 19,818	$ 17,423
Actual Ratio	7.50%	7.60%
Minimum Capital Requirement Amount	$ 10,622	$ 9,218
Minimum Capital Requirement Ratio	4.00%	4.00%
CSB [Member]
Common Equity Tier 1 Risk-Based Capital
Actual Amount	$ 15,164	$ 13,355
Actual Ratio	20.20%	20.10%
Minimum to be Well Capitalized Amount	$ 4,890	$ 4,324
Minimum to be Well Capitalized Ratio	6.50%	6.50%
Minimum Capital Requirement Amount	$ 3,385	$ 2,993
Minimum Capital Requirement Ratio	4.50%	4.50%
Tier 1 Risk-Based Capital
Actual Amount	$ 15,164	$ 13,355
Actual Ratio	20.20%	20.10%
Minimum to be Well Capitalized Amount	$ 6,018	$ 5,321
Minimum to be Well Capitalized Ratio	8.00%	8.00%
Minimum Capital Requirement Amount	$ 4,513	$ 3,991
Minimum Capital Requirement Ratio	6.00%	6.00%
Total Risk-Based Capital
Actual Amount	$ 15,191	$ 13,382
Actual Ratio	20.20%	20.10%
Minimum to be Well Capitalized Amount	$ 7,522	$ 6,652
Minimum to be Well Capitalized Ratio	10.00%	10.00%
Minimum Capital Requirement Amount	$ 6,018	$ 5,321
Minimum Capital Requirement Ratio	8.00%	8.00%
Tier 1 Leverage
Actual Amount	$ 15,164	$ 13,355
Actual Ratio	7.10%	7.10%
Minimum to be Well Capitalized Amount	$ 10,668	$ 9,462
Minimum to be Well Capitalized Ratio	5.00%	5.00%
Minimum Capital Requirement Amount	$ 8,534	$ 7,569
Minimum Capital Requirement Ratio	4.00%	4.00%

Regulatory Requirements (Narrat

Regulatory Requirements (Narrative) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total assets	$ 272,102	$ 243,274
CSSB [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total assets	$ 13,100

Regulatory Requirements (Net Ca

Regulatory Requirements (Net Capital and Net Capital Requirements) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Banking and Thrift [Abstract]
Net Capital	$ 2,280,000	$ 2,118,000
Minimum net capital required	250	250
2% of aggregate debit balances	476,000	435,000
Net Capital in excess of required net capital	$ 1,804,000	$ 1,683,000

Segment Information (Narrative)

Segment Information (Narrative) (Details)	9 Months Ended
	Sep. 30, 2018segment
Segment Reporting [Abstract]
Number of reportable segments	2

Segment Information (Financial

Segment Information (Financial Information for Reportable Segments) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net Revenues
Net interest revenue	$ 1,527	$ 1,082	$ 4,197	$ 3,135
Asset management and administration fees	809	861	2,474	2,529
Trading revenue	176	151	557	500
Other	67	71	235	212
Total net revenues	2,579	2,165	7,463	6,376
Expenses Excluding Interest	1,360	1,220	4,111	3,679
Income before taxes on income	1,219	945	3,352	2,697
Investor Services [Member]
Net Revenues
Net interest revenue	1,138	818	3,158	2,366
Asset management and administration fees	565	595	1,727	1,743
Trading revenue	112	94	354	311
Other	53	54	182	159
Total net revenues	1,868	1,561	5,421	4,579
Expenses Excluding Interest	1,015	918	3,069	2,762
Income before taxes on income	853	643	2,352	1,817
Advisor Services [Member]
Net Revenues
Net interest revenue	389	264	1,039	769
Asset management and administration fees	244	266	747	786
Trading revenue	64	57	203	189
Other	14	17	53	53
Total net revenues	711	604	2,042	1,797
Expenses Excluding Interest	345	302	1,042	917
Income before taxes on income	$ 366	$ 302	$ 1,000	$ 880

Subsequent Events (Details)

Subsequent Events (Details) - USD ($)	Oct. 31, 2018	Oct. 25, 2018	Sep. 30, 2018	Dec. 31, 2017
Subsequent Event [Line Items]
Debt issued			$ 5,781,000,000	$ 4,731,000,000
Senior Notes [Member] | Senior Notes Due 2024 [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Debt issued	$ 500,000,000
Fixed interest rate	3.55%
Senior Notes [Member] | Senior Notes Due 2029 [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Debt issued	$ 600,000,000
Fixed interest rate	4.00%
Common Stock [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Share repurchase, authorized amount		$ 1,000,000,000