Investments (AFS contractual maturity) (Details) - Ameriprise Financial [Member] - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Amortized cost
Due within one year	$ 2,700
Due after one year through five years	4,749
Due after five years through 10 years	2,479
Due after 10 years	3,980
Total having single maturity dates	13,908
Amortized cost	31,249	$ 31,332
Fair value
Due within one year	2,706
Due after one year through five years	4,741
Due after five years through 10 years	2,562
Due after 10 years	4,643
Total having single maturity dates	14,652
Fair value	31,846	33,129
Residential mortgage backed securities [Member]
Amortized cost
Without single maturity dates	9,734
Amortized cost	9,734	9,954
Fair value
Without single maturity dates	9,715
Fair value	9,715	10,029
Commercial mortgage backed securities [Member]
Amortized cost
Without single maturity dates	5,478
Amortized cost	5,478	5,473
Fair value
Without single maturity dates	5,395
Fair value	5,395	5,563
Asset backed securities [Member]
Amortized cost
Without single maturity dates	2,129
Amortized cost	2,129	1,968
Fair value
Without single maturity dates	2,084
Fair value	$ 2,084	$ 2,006