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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, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Rollforward of available-for-Sale securities allowance for credit losses |  |  |  |  |  |
Beginning Balance | $ 0 | $ 14 | $ 11 | [1] | $ 0 | [1]
Additions for which credit losses were not previously recorded | 1 | 0 | 1 |  | 13 |
Additional increases (decreases) on securities that had an allowance recorded in a previous period |  |  |  |  | 1 |
Charge-offs |  |  | (11) |  |  |
Ending Balance | 1 | 14 | 1 |  | 14 |
Corporate debt securities |  |  |  |  |  |
Rollforward of available-for-Sale securities allowance for credit losses |  |  |  |  |  |
Beginning Balance | 0 | 13 | 10 | [1] | 0 | [1]
Additions for which credit losses were not previously recorded |  | 0 |  |  | 13 |
Charge-offs | 0 |  | (10) |  |  |
Ending Balance | 0 | 13 | 0 |  | 13 |
Asset backed securities |  |  |  |  |  |
Rollforward of available-for-Sale securities allowance for credit losses |  |  |  |  |  |
Beginning Balance | 0 | 1 | 1 | [1] | 0 | [1]
Additions for which credit losses were not previously recorded |  | 0 |  |  |  |
Additional increases (decreases) on securities that had an allowance recorded in a previous period |  |  |  |  | 1 |
Charge-offs | 0 |  | (1) |  |  |
Ending Balance | 0 | $ 1 | 0 |  | $ 1 |
State and municipal obligations |  |  |  |  |  |
Rollforward of available-for-Sale securities allowance for credit losses |  |  |  |  |  |
Beginning Balance | 0 |  | 0 |  |  |
Additions for which credit losses were not previously recorded | 1 |  | 1 |  |  |
Ending Balance | $ 1 |  | $ 1 |  |  |
[1] | Prior to January 1, 2020, credit losses on Available-for-Sale securities were not recorded in an allowance but were recorded as a reduction of the book value of the security if the security was other-than-temporarily impaired.

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 + Details
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- Definition Amount of expense (reversal of expense) for 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), not intended to be sold and not more likely than not will be required to sell before recovery of amortized cost basis, with previously recorded allowance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 + Details
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- Definition Amount of writeoff 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 -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
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