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Investments Investments (EITF info-Fair value) (Details) - Ameriprise Financial [Member] - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Fair Value [Line Items] |  |
Less than 12 months | $ 2,193 | $ 6,637
12 months or more | 1,046 | 1,936
Total | 3,239 | 8,573
Corporate debt securities [Member] |  |
Fair Value [Line Items] |  |
Less than 12 months | 228 | 66
12 months or more | 19 | 173
Total | 247 | 239
Residential mortgage backed securities [Member] |  |
Fair Value [Line Items] |  |
Less than 12 months | 833 | 4,328
12 months or more | 391 | 1,164
Total | 1,224 | 5,492
Commercial mortgage backed securities [Member] |  |
Fair Value [Line Items] |  |
Less than 12 months | 781 | 1,622
12 months or more | 393 | 314
Total | 1,174 | 1,936
Asset backed securities [Member] |  |
Fair Value [Line Items] |  |
Less than 12 months | 344 | 598
12 months or more | 231 | 213
Total | 575 | 811
State and municipal obligations [Member] |  |
Fair Value [Line Items] |  |
Less than 12 months | 4 | 23
12 months or more | 4 | 57
Total | 8 | 80
Foreign government bonds and obligations [Member] |  |
Fair Value [Line Items] |  |
Less than 12 months | 3 | 0
12 months or more | 8 | 15
Total | $ 11 | $ 15

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