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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, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Rollforward of Available-for-Sale securities allowance for credit losses |  |  |
Beginning Balance | $ 9 | $ 2 | $ 22
Reductions for securities sold during the period (realized) | (8) | (1) | (21)
Additions for which credit losses were not previously recorded |  | 4 |
Ending Balance | 1 | 5 | 1
Corporate debt securities |  |  |
Rollforward of Available-for-Sale securities allowance for credit losses |  |  |
Beginning Balance | 7 | 1 | 20
Reductions for securities sold during the period (realized) | (7) | (1) | (20)
Additions for which credit losses were not previously recorded |  | 0 |
Ending Balance | 0 | 0 | 0
Commercial mortgage backed securities |  |  |
Rollforward of Available-for-Sale securities allowance for credit losses |  |  |
Beginning Balance | 0 | 0 | 0
Reductions for securities sold during the period (realized) | 0 | 0 | 0
Additions for which credit losses were not previously recorded |  | 4 |
Ending Balance | 0 | 4 | 0
State and municipal obligations |  |  |
Rollforward of Available-for-Sale securities allowance for credit losses |  |  |
Beginning Balance | 2 | 1 | 2
Reductions for securities sold during the period (realized) | (1) | 0 | (1)
Additions for which credit losses were not previously recorded |  | 0 |
Ending Balance | $ 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 + 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 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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