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Fair Value Measurement - Carrying Amount and Estimated Fair Value of Financial Instruments (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Carrying Value |  |
Financial Assets: |  |
Cash and cash equivalents | $ 15,430 | $ 11,475
FHLB and FRB stock | 1,146 | 1,392
Loans and leases held for investment, net | 67,071 | 83,627
Financial Liabilities: |  |
Deposits | 75,870 | 81,526
Borrowed funds | 14,426 | 21,267
Estimated Fair Value |  |
Financial Assets: |  |
Cash and cash equivalents | 15,430 | 11,475
FHLB and FRB stock | 1,146 | 1,392
Loans and leases held for investment, net | 61,831 | 79,333
Financial Liabilities: |  |
Deposits | 75,894 | 81,247
Borrowed funds | 14,217 | 21,082
Estimated Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Financial Assets: |  |
Cash and cash equivalents | 15,430 | 11,475
FHLB and FRB stock | 0 | 0
Loans and leases held for investment, net | 0 | 0
Financial Liabilities: |  |
Deposits | 48,546 | 59,972
Borrowed funds | 0 | 0
Estimated Fair Value | Significant Other Observable Inputs (Level 2) |  |
Financial Assets: |  |
Cash and cash equivalents | 0 | 0
FHLB and FRB stock | 1,146 | 1,392
Loans and leases held for investment, net | 0 | 0
Financial Liabilities: |  |
Deposits | 27,348 | 21,275
Borrowed funds | 14,217 | 21,082
Estimated Fair Value | Significant Unobservable Inputs (Level 3) |  |
Financial Assets: |  |
Cash and cash equivalents | 0 | 0
FHLB and FRB stock | 0 | 0
Loans and leases held for investment, net | 61,831 | 79,333
Financial Liabilities: |  |
Deposits | 0 | 0
Borrowed funds | $ 0 | $ 0

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- Definition Federal Home Loan Bank And Federal Reserve Bank Stock, Fair Value Disclosure + References No definition available. + Details
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- 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 Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- 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 Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2E -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- 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://www.xbrl.org/2009/role/commonPracticeRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-10 + Details
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- 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 Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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