Investments (AFS contractual maturity) (Details) - Ameriprise Financial - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Amortized cost
Due within one year	$ 2,534
Due after one year through five years	4,131
Due after five years through 10 years	3,907
Due after 10 years	4,132
Total having single maturity dates	14,704
Amortized cost	33,858	$ 33,601
Fair value
Due within one year	2,551
Due after one year through five years	4,412
Due after five years through 10 years	4,115
Due after 10 years	5,560
Total having single maturity dates	16,638
Fair value	36,146	36,283
Residential mortgage backed securities
Amortized cost
Without single maturity dates	9,556
Amortized cost	9,556	9,845
Fair value
Without single maturity dates	9,682
Fair value	9,682	10,029
Commercial mortgage backed securities
Amortized cost
Without single maturity dates	5,995
Amortized cost	5,995	5,867
Fair value
Without single maturity dates	6,178
Fair value	6,178	6,088
Asset backed securities
Amortized cost
Without single maturity dates	3,603
Amortized cost	3,603	3,283
Fair value
Without single maturity dates	3,648
Fair value	$ 3,648	$ 3,329