Fair Values of Assets and Liabilities (Fair Value of Other Financial Instruments) (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Assets
Held to maturity securities:	$ 105,286	$ 0
Carrying Amount [Member]
Assets
Cash and cash equivalents	71,427	51,256
Cash and investments segregated and on deposit for regulatory purposes	18,385	17,246
Receivables from brokerage clients — net	84,065	90,560
Held to maturity securities:	105,286
Bank loans – net	37,207	34,636
Other assets:	3,828	3,561
Liabilities
Bank deposits	465,827	443,778
Payables to brokerage clients	125,307	125,671
Accrued expenses and other liabilities	8,492	8,327
Short-term borrowings	4,234	4,855
Long-term debt	21,782	18,820
Carrying Amount [Member] \| First Mortgage [Member]
Assets
Bank loans – net	22,668	21,077
Carrying Amount [Member] \| HELOCs [Member]
Assets
Bank loans – net	614	646
Carrying Amount [Member] \| Pledged asset lines [Member]
Assets
Bank loans – net	13,716	12,709
Carrying Amount [Member] \| Other [Member]
Assets
Bank loans – net	209	204
Carrying Amount [Member] \| U.S. agency mortgage-backed securities [Member]
Assets
Held to maturity securities:	105,286
Portion at Other than Fair Value Measurement [Member]
Assets
Cash and cash equivalents	71,427	51,256
Cash and investments segregated and on deposit for regulatory purposes	18,385	17,246
Receivables from brokerage clients — net	84,065	90,560
Held to maturity securities:	99,149
Bank loans – net	35,983	34,608
Other assets:	3,828	3,561
Liabilities
Bank deposits	465,827	443,778
Payables to brokerage clients	125,307	125,671
Accrued expenses and other liabilities	8,492	8,327
Short-term borrowings	4,234	4,855
Long-term debt	21,257	19,383
Portion at Other than Fair Value Measurement [Member] \| First Mortgage [Member]
Assets
Bank loans – net	21,421	21,027
Portion at Other than Fair Value Measurement [Member] \| HELOCs [Member]
Assets
Bank loans – net	637	668
Portion at Other than Fair Value Measurement [Member] \| Pledged asset lines [Member]
Assets
Bank loans – net	13,716	12,709
Portion at Other than Fair Value Measurement [Member] \| Other [Member]
Assets
Bank loans – net	209	204
Portion at Other than Fair Value Measurement [Member] \| U.S. agency mortgage-backed securities [Member]
Assets
Held to maturity securities:	99,149
Portion at Other than Fair Value Measurement [Member] \| Level 1 [Member]
Assets
Cash and cash equivalents	71,427	51,256
Cash and investments segregated and on deposit for regulatory purposes	4,376	4,151
Receivables from brokerage clients — net	0	0
Held to maturity securities:	0
Bank loans – net	0	0
Other assets:	0	0
Liabilities
Bank deposits	0	0
Payables to brokerage clients	0	0
Accrued expenses and other liabilities	0	0
Short-term borrowings	0	0
Long-term debt	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
Portion at Other than Fair Value Measurement [Member] \| Level 2 [Member]
Assets
Cash and cash equivalents	0	0
Cash and investments segregated and on deposit for regulatory purposes	14,009	13,095
Receivables from brokerage clients — net	84,065	90,560
Held to maturity securities:	99,149
Bank loans – net	35,983	34,608
Other assets:	3,828	3,561
Liabilities
Bank deposits	465,827	443,778
Payables to brokerage clients	125,307	125,671
Accrued expenses and other liabilities	8,492	8,327
Short-term borrowings	4,234	4,855
Long-term debt	21,257	19,383
Portion at Other than Fair Value Measurement [Member] \| Level 2 [Member] \| First Mortgage [Member]
Assets
Bank loans – net	21,421	21,027
Portion at Other than Fair Value Measurement [Member] \| Level 2 [Member] \| HELOCs [Member]
Assets
Bank loans – net	637	668
Portion at Other than Fair Value Measurement [Member] \| Level 2 [Member] \| Pledged asset lines [Member]
Assets
Bank loans – net	13,716	12,709
Portion at Other than Fair Value Measurement [Member] \| Level 2 [Member] \| Other [Member]
Assets
Bank loans – net	209	204
Portion at Other than Fair Value Measurement [Member] \| Level 2 [Member] \| U.S. agency mortgage-backed securities [Member]
Assets
Held to maturity securities:	99,149
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 brokerage clients — net	0	0
Held to maturity securities:	0
Bank loans – net	0	0
Other assets:	0	0
Liabilities
Bank deposits	0	0
Payables to brokerage clients	0	0
Accrued expenses and other liabilities	0	0
Short-term borrowings	0	0
Long-term debt	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

Cash And Securities Segregated Under Federal And Other Regulations, Fair Value Disclosure

No definition available.

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- Definition

Payables To Customer, Fair Value Disclosure

+ References

No definition available.

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- Definition

Fair value portion of amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611

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- Definition

Fair value portion of accrued expenses.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.20)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount excluding accrued interest, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- References

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- References

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-URI http://asc.fasb.org/subtopic&trid=2196772

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Fair value portion of other assets.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the amount of short-term debt existing as of the balance sheet date.

+ References

No definition available.

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