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Investments (AFS contractual maturity) (Details) - Ameriprise Financial [Member] - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Amortized Cost |  |
Due within one year | $ 2,569 |
Due after one year through five years | 4,717 |
Due after five years through 10 years | 2,908 |
Due after 10 years | 4,412 |
Total having single maturity dates | 14,606 |
Amortized cost | 33,601 | $ 31,332
Fair Value |  |
Due within one year | 2,584 |
Due after one year through five years | 5,057 |
Due after five years through 10 years | 3,213 |
Due after 10 years | 5,983 |
Total having single maturity dates | 16,837 |
Fair value | 36,283 | 33,129
Residential mortgage backed securities [Member] |  |
Amortized Cost |  |
Without single maturity dates | 9,845 |
Amortized cost | 9,845 | 9,954
Fair Value |  |
Without single maturity dates | 10,029 |
Fair value | 10,029 | 10,029
Commercial mortgage backed securities [Member] |  |
Amortized Cost |  |
Without single maturity dates | 5,867 |
Amortized cost | 5,867 | 5,473
Fair Value |  |
Without single maturity dates | 6,088 |
Fair value | 6,088 | 5,563
Asset backed securities [Member] |  |
Amortized Cost |  |
Without single maturity dates | 3,283 |
Amortized cost | 3,283 | 1,968
Fair Value |  |
Without single maturity dates | 3,329 |
Fair value | $ 3,329 | $ 2,006

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