Investments (AFS contractual maturity) (Details) - Ameriprise Financial [Member] - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Amortized cost
Due within one year	$ 2,241
Due after one year through five years	4,757
Due after five years through 10 years	3,423
Due after 10 years	4,235
Total having single maturity dates	14,656
Amortized cost	33,879	$ 33,601
Fair value
Due within one year	2,251
Due after one year through five years	5,058
Due after five years through 10 years	3,565
Due after 10 years	5,394
Total having single maturity dates	16,268
Fair value	35,832	36,283
Residential mortgage backed securities [Member]
Amortized cost
Without single maturity dates	9,903
Amortized cost	9,903	9,845
Fair value
Without single maturity dates	10,042
Fair value	10,042	10,029
Commercial mortgage backed securities [Member]
Amortized cost
Without single maturity dates	5,876
Amortized cost	5,876	5,867
Fair value
Without single maturity dates	6,037
Fair value	6,037	6,088
Asset backed securities [Member]
Amortized cost
Without single maturity dates	3,444
Amortized cost	3,444	3,283
Fair value
Without single maturity dates	3,485
Fair value	$ 3,485	$ 3,329