Investments (Holdings info) (Details) - Ameriprise Financial [Member] - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Investments	$ 36,202	$ 35,834
Available-for-sale securities [Member]
Investments	30,826	30,719
Mortgage loans, net [Member]
Investments	3,000	2,986
Policy and certificate loans [Member]
Investments	841	831
Other investments [Member]
Investments	$ 1,535	$ 1,298