Investments (Holdings info) (Details) - Ameriprise Financial [Member] - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Investments	$ 35,925	$ 35,834
Available-for-Sale securities, at fair value [Member]
Investments	30,927	30,719
Mortgage loans, net [Member]
Investments	2,756	2,986
Policy and certificate loans [Member]
Investments	845	831
Other investments [Member]
Investments	$ 1,397	$ 1,298