Investments (Holdings info) (Details) - Ameriprise Financial [Member] - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Investments	$ 40,437	$ 41,031
Investments, Allowance for Credit Losses	39	52
Available-for-sale securities [Member]
Investments	35,832	36,283
Mortgages [Member]
Investments	2,684	2,718
Investments, Allowance for Credit Losses	29	29
Policy and certificate loans [Member]
Investments	838	846
Other investments [Member]
Investments	1,083	1,184
Investments, Allowance for Credit Losses	$ 9	$ 12