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Allowance for Credit Losses on Loans and Leases - Schedule of Activity in the Allowance for Loan and Lease Losses (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Balance, beginning of period | $ 1,268 | $ 594 | $ 992 | $ 393 | $ 393
Adjustment for Purchased PCD Loans |  |  |  | 13 |
Charge-offs | (260) | (26) | (705) | (35) |
Recoveries | 21 | 2 | 35 | 12 |
Provision for (recovery of) credit losses on loans and leases | 235 | 49 | 942 | 236 |
Balance, end of period | 1,264 | 619 | 1,264 | 619 | 992
Loans and Leases Held for Investment: | Multi-family |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Balance, beginning of period | 618 | 192 | 307 | 178 | 178
Adjustment for Purchased PCD Loans |  |  |  | 0 |
Charge-offs | (101) | (2) | (188) | (2) | (119)
Recoveries | 3 | 0 | 4 | 0 |
Provision for (recovery of) credit losses on loans and leases | 104 | (6) | 501 | 8 |
Balance, end of period | 624 | 184 | 624 | 184 | 307
Loans and Leases Held for Investment: | Commercial real estate |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Balance, beginning of period | 328 | 69 | 366 | 46 | 46
Adjustment for Purchased PCD Loans |  |  |  | 0 |
Charge-offs | (110) | (13) | (411) | (14) | (56)
Recoveries | 6 | 0 | 6 | 0 |
Provision for (recovery of) credit losses on loans and leases | 68 | 64 | 331 | 88 |
Balance, end of period | 292 | 120 | 292 | 120 | 366
Loans and Leases Held for Investment: | One-to-four family first mortgage |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Balance, beginning of period | 40 | 45 | 47 | 46 | 46
Adjustment for Purchased PCD Loans |  |  |  | 0 |
Charge-offs | (7) | (1) | (8) | (3) | (3)
Recoveries | 5 | 0 | 5 | 0 |
Provision for (recovery of) credit losses on loans and leases | 4 | (1) | (2) | 0 |
Balance, end of period | 42 | 43 | 42 | 43 | 47
Loans and Leases Held for Investment: | Acquisition, development, and construction |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Balance, beginning of period | 43 | 23 | 36 | 20 | 20
Adjustment for Purchased PCD Loans |  |  |  | 0 |
Charge-offs | (4) | 0 | (4) | 0 | 0
Recoveries | 0 | 0 | 0 | 0 |
Provision for (recovery of) credit losses on loans and leases | 11 | 8 | 18 | 11 |
Balance, end of period | 50 | 31 | 50 | 31 | 36
Other |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Balance, beginning of period | 239 | 265 | 236 | 103 | 103
Adjustment for Purchased PCD Loans |  |  |  | 13 |
Charge-offs | (38) | (10) | (94) | (16) |
Recoveries | 7 | 2 | 20 | 12 |
Provision for (recovery of) credit losses on loans and leases | 48 | (16) | 94 | 129 |
Balance, end of period | $ 256 | $ 241 | $ 256 | $ 241 | $ 236

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- Definition Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-1 + Details
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- Definition Amount, excluding accrued interest, of increase in allowance for credit loss on financing receivable from recovery. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
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- Definition Amount, excluding accrued interest, of allowance for credit loss at acquisition date of financing receivable purchased with credit deterioration. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 19 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-19 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
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