Investments (AFS contractual maturity) (Details 8) - Ameriprise Financial [Member] - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Amortized cost
Due within one year	$ 3,194
Due after one year through five years	4,710
Due after five years through 10 years	3,294
Due after 10 years	4,204
Total having single maturity dates	15,402
Amortized cost	27,771	$ 30,671
Fair value
Due within one year	3,197
Due after one year through five years	4,779
Due after five years through 10 years	3,400
Due after 10 years	4,983
Total having single maturity dates	16,359
Fair value	28,764	31,058
Residential mortgage backed securities [Member]
Amortized cost
Without single maturity dates	6,291
Amortized cost	6,291	6,373
Fair value
Without single maturity dates	6,301
Fair value	6,301	6,329
Commercial mortgage backed securities [Member]
Amortized cost
Without single maturity dates	4,810
Amortized cost	4,810	4,975
Fair value
Without single maturity dates	4,801
Fair value	4,801	4,877
Asset backed securities [Member]
Amortized cost
Without single maturity dates	1,268
Amortized cost	1,268	1,373
Fair value
Without single maturity dates	1,303
Fair value	$ 1,303	$ 1,398