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Bank Deposits - Deposits from Banking Clients Consisting of Interest Bearing and Noninterest Bearing Deposits (Details) - USD ($)	Sep. 30, 2025	Dec. 31, 2024
Interest-bearing deposits:
Deposits swept from brokerage accounts	$ 209,205,000,000	$ 210,575,000,000
Checking	15,124,000,000	15,593,000,000
Time certificates of deposit	9,936,000,000	27,701,000,000
Savings and other	3,569,000,000	4,015,000,000
Total interest-bearing deposits	237,834,000,000	257,884,000,000
Non-interest-bearing deposits	1,223,000,000	1,237,000,000
Total bank deposits	$ 239,057,000,000	$ 259,121,000,000
Weighted-average interest rates on outstanding time certificates of deposit	4.21%	4.90%
Uninsured time CDs and time deposits in excess of FDIC insurance limits	$ 0	$ 0

X

- Definition

The amount of interest-bearing deposits swept from brokerage accounts.

+ References

No definition available.

+ Details

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Namespace Prefix:	schw_
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Balance Type:	credit
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X

- Definition

Savings and Other

+ References

No definition available.

+ Details

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X

- Definition

The amount of money in accounts that may bear interest and that the depositor is entitled to withdraw at any time without prior notice.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(12))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

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X

- Definition

The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(12))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

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X

- Definition

The aggregate of all domestic and foreign interest-bearing deposit liabilities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(12))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

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- References

No definition available.

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Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

Amount of interest-bearing domestic time deposits. Time deposits bear interest for a fixed, stated period of time and include certificate of deposits and individual retirement accounts.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(12))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

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X

- Definition

The aggregate amount of all domestic and foreign noninterest-bearing deposits liabilities held by the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(12))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

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- Definition

Amount of time deposit liabilities, including certificates of deposit, in denominations that meet or exceed the Federal Deposit Insurance Corporation (FDIC) insurance limit.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-SubTopic 405
-Topic 942
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478353/942-405-50-1

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- Definition

The weighted average interest rate for domestic certificates of deposit liabilities.

+ References

No definition available.

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