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Investments - Available-for-Sale Securities by Type (Details) - Ameriprise Financial - USD ($) $ in Millions | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019 | [1]
--- | --- | --- | --- | --- | --- | --- | ---
Investments |  |  |  |  |  |  |
Amortized cost | $ 28,408 |  | $ 33,601 |  |  |  |
Gross unrealized gains | 1,769 |  | 2,727 |  |  |  |
Gross unrealized losses | (62) |  | (34) |  |  |  |
Allowance for Credit Loss | (1) | $ 0 | (11) | [1] | $ (14) | $ (14) | $ 0
Fair value | 30,114 |  | 36,283 |  |  |  |
Accrued interest excluded from amortized cost basis | 144 |  | 178 |  |  |  |
Fair value of investment securities pledged to meet contractual obligations | 3,000 |  | 3,600 |  |  |  |
Fair value of investment securities pledged that may be sold, pledged or rehypothecated by the counterparty | 403 |  | 454 |  |  |  |
Corporate debt securities |  |  |  |  |  |  |
Investments |  |  |  |  |  |  |
Amortized cost | 8,455 |  | 11,762 |  |  |  |
Gross unrealized gains | 1,301 |  | 1,924 |  |  |  |
Gross unrealized losses | (31) |  | (2) |  |  |  |
Allowance for Credit Loss | 0 | 0 | (10) | [1] | (13) | (13) | 0
Fair value | 9,725 |  | 13,674 |  |  |  |
Residential mortgage backed securities |  |  |  |  |  |  |
Investments |  |  |  |  |  |  |
Amortized cost | 9,628 |  | 9,845 |  |  |  |
Gross unrealized gains | 90 |  | 188 |  |  |  |
Gross unrealized losses | (19) |  | (4) |  |  |  |
Fair value | 9,699 |  | 10,029 |  |  |  |
Commercial mortgage backed securities |  |  |  |  |  |  |
Investments |  |  |  |  |  |  |
Amortized cost | 4,712 |  | 5,867 |  |  |  |
Gross unrealized gains | 92 |  | 242 |  |  |  |
Gross unrealized losses | (9) |  | (21) |  |  |  |
Fair value | 4,795 |  | 6,088 |  |  |  |
Asset backed securities |  |  |  |  |  |  |
Investments |  |  |  |  |  |  |
Amortized cost | 3,465 |  | 3,283 |  |  |  |
Gross unrealized gains | 31 |  | 52 |  |  |  |
Gross unrealized losses | (1) |  | (5) |  |  |  |
Allowance for Credit Loss | 0 | 0 | (1) | [1] | $ (1) | $ (1) | $ 0
Fair value | 3,495 |  | 3,329 |  |  |  |
State and municipal obligations |  |  |  |  |  |  |
Investments |  |  |  |  |  |  |
Amortized cost | 857 |  | 1,088 |  |  |  |
Gross unrealized gains | 249 |  | 297 |  |  |  |
Gross unrealized losses | (1) |  | (1) |  |  |  |
Allowance for Credit Loss | (1) | $ 0 | 0 |  |  |  |
Fair value | 1,104 |  | 1,384 |  |  |  |
U.S. government and agencies obligations |  |  |  |  |  |  |
Investments |  |  |  |  |  |  |
Amortized cost | 1,196 |  | 1,456 |  |  |  |
Fair value | 1,196 |  | 1,456 |  |  |  |
Foreign government bonds and obligations |  |  |  |  |  |  |
Investments |  |  |  |  |  |  |
Amortized cost | 82 |  | 241 |  |  |  |
Gross unrealized gains | 6 |  | 22 |  |  |  |
Gross unrealized losses | (1) |  | (1) |  |  |  |
Fair value | 87 |  | 262 |  |  |  |
Other securities |  |  |  |  |  |  |
Investments |  |  |  |  |  |  |
Amortized cost | 13 |  | 59 |  |  |  |
Gross unrealized gains |  |  | 2 |  |  |  |
Fair value | $ 13 |  | $ 61 |  |  |  |
[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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