Investments (AFS contractual maturity) (Details) - Ameriprise Financial [Member] - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Amortized cost
Due within one year	$ 2,759
Due after one year through five years	5,007
Due after five years through 10 years	2,273
Due after 10 years	3,965
Total having single maturity dates	14,004
Amortized cost	32,318	$ 31,332
Fair value
Due within one year	2,774
Due after one year through five years	5,290
Due after five years through 10 years	2,545
Due after 10 years	5,184
Total having single maturity dates	15,793
Fair value	34,442	33,129
Residential mortgage backed securities [Member]
Amortized cost
Without single maturity dates	9,783
Amortized cost	9,783	9,954
Fair value
Without single maturity dates	9,956
Fair value	9,956	10,029
Commercial mortgage backed securities [Member]
Amortized cost
Without single maturity dates	5,731
Amortized cost	5,731	5,473
Fair value
Without single maturity dates	5,880
Fair value	5,880	5,563
Asset backed securities [Member]
Amortized cost
Without single maturity dates	2,800
Amortized cost	2,800	1,968
Fair value
Without single maturity dates	2,813
Fair value	$ 2,813	$ 2,006