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Investments - Rollforward of Allowance for Credit Losses (Details) - Ameriprise Financial - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Rollforward of Available-for-Sale securities allowance for credit losses |  |  |  |
Beginning Balance | $ 5 | $ 5 | $ 5 | $ 2
Additional increases (decreases) on securities that had an allowance recorded in a previous period | (1) | 0 | (1) |
Additions for which credit losses were not previously recorded |  |  |  | 4
Reductions for securities sold during the period (realized) |  |  |  | (1)
Ending Balance | 4 | 5 | 4 | 5
Corporate debt securities |  |  |  |
Rollforward of Available-for-Sale securities allowance for credit losses |  |  |  |
Beginning Balance | 0 | 0 | 0 | 1
Additional increases (decreases) on securities that had an allowance recorded in a previous period | 0 | 0 | 0 |
Additions for which credit losses were not previously recorded |  |  |  | 0
Reductions for securities sold during the period (realized) |  |  |  | (1)
Ending Balance | 0 | 0 | 0 | 0
Commercial mortgage backed securities |  |  |  |
Rollforward of Available-for-Sale securities allowance for credit losses |  |  |  |
Beginning Balance | 4 | 4 | 4 | 0
Additional increases (decreases) on securities that had an allowance recorded in a previous period | (1) | 0 | (1) |
Additions for which credit losses were not previously recorded |  |  |  | 4
Reductions for securities sold during the period (realized) |  |  |  | 0
Ending Balance | 3 | 4 | 3 | 4
State and municipal obligations |  |  |  |
Rollforward of Available-for-Sale securities allowance for credit losses |  |  |  |
Beginning Balance | 1 | 1 | 1 | 1
Additional increases (decreases) on securities that had an allowance recorded in a previous period | 0 | 0 | 0 |
Additions for which credit losses were not previously recorded |  |  |  | 0
Reductions for securities sold during the period (realized) |  |  |  | 0
Ending Balance | $ 1 | $ 1 | $ 1 | $ 1

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- Definition Amount of expense for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), for which no credit loss was previously recorded. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-9 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147476148/220-40-50-22 + 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 allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479130/326-30-45-1 + Details
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- Definition Amount, excluding accrued interest, of credit loss expense (reversal of expense) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) with previously recorded allowance and not intended to be sold and not more likely than not will be required to sell before recovery of amortized cost basis. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-9 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147476148/220-40-50-22 + Details
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- Definition Amount, excluding accrued interest, of decrease in allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) from sale. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-9 + Details
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