Investments (AFS contractual maturity) (Details) - Ameriprise Financial [Member] - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Amortized Cost
Due within one year	$ 2,569
Due after one year through five years	4,717
Due after five years through 10 years	2,908
Due after 10 years	4,412
Total having single maturity dates	14,606
Amortized cost	33,601	$ 31,332
Fair Value
Due within one year	2,584
Due after one year through five years	5,057
Due after five years through 10 years	3,213
Due after 10 years	5,983
Total having single maturity dates	16,837
Fair value	36,283	33,129
Residential mortgage backed securities [Member]
Amortized Cost
Without single maturity dates	9,845
Amortized cost	9,845	9,954
Fair Value
Without single maturity dates	10,029
Fair value	10,029	10,029
Commercial mortgage backed securities [Member]
Amortized Cost
Without single maturity dates	5,867
Amortized cost	5,867	5,473
Fair Value
Without single maturity dates	6,088
Fair value	6,088	5,563
Asset backed securities [Member]
Amortized Cost
Without single maturity dates	3,283
Amortized cost	3,283	1,968
Fair Value
Without single maturity dates	3,329
Fair value	$ 3,329	$ 2,006