Investments (AFS contractual maturity) (Details) - Ameriprise Financial [Member] - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Amortized Cost
Due within one year	$ 2,471
Due after one year through five years	4,723
Due after five years through 10 years	2,667
Due after 10 years	4,076
Total having single maturity dates	13,937
Amortized cost	31,332	$ 30,671
Fair Value
Due within one year	2,476
Due after one year through five years	4,900
Due after five years through 10 years	2,890
Due after 10 years	5,265
Total having single maturity dates	15,531
Fair value	33,129	31,058
Residential mortgage backed securities [Member]
Amortized Cost
Without single maturity dates	9,954
Amortized cost	9,954	6,373
Fair Value
Without single maturity dates	10,029
Fair value	10,029	6,329
Commercial mortgage backed securities [Member]
Amortized Cost
Without single maturity dates	5,473
Amortized cost	5,473	4,975
Fair Value
Without single maturity dates	5,563
Fair value	5,563	4,877
Asset backed securities [Member]
Amortized Cost
Without single maturity dates	1,968
Amortized cost	1,968	1,373
Fair Value
Without single maturity dates	2,006
Fair value	$ 2,006	$ 1,398