Investments (Holdings info) (Details) - Ameriprise Financial [Member] - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Investments	$ 41,031	$ 37,915
Investments, Allowance for Credit Losses	52	24
Available-for-Sale securities, at fair value [Member]
Investments	36,283	33,129
Mortgage loans, net [Member]
Investments	2,718	2,778
Investments, Allowance for Credit Losses	29	19
Policy and certificate loans [Member]
Investments	846	868
Other investments [Member]
Investments	1,184	1,140
Investments, Allowance for Credit Losses	$ 12	$ 5