Investments (Holdings info) (Details) - Ameriprise Financial [Member] - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Investments	$ 35,725	$ 35,825
Available-for-sale securities [Member]
Investments	30,967	31,058
Mortgage loans, net [Member]
Investments	2,704	2,696
Policy and certificate loans [Member]
Investments	864	861
Other investments [Member]
Investments	$ 1,190	$ 1,210