Investments (Holdings info) (Details) - Ameriprise Financial [Member] - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Investments, Allowance for Credit Losses	$ 52	$ 24	[1]
Investments	36,626	37,915
Available-for-sale securities [Member]
Investments, Allowance for Credit Losses	13
Investments	31,846	33,129
Mortgage loans, net [Member]
Investments, Allowance for Credit Losses	26	19
Investments	2,779	2,778
Policy and certificate loans [Member]
Investments	869	868
Other investments [Member]
Investments, Allowance for Credit Losses	13	5
Investments	$ 1,132	$ 1,140

[1] Prior to January 1, 2020, the allowance for credit losses is not applicable to Available-for-Sale securities. See Notes 2, 3, 6 and 7 for more information.