Investments (AFS contractual maturity) (Details 8) - Ameriprise Financial [Member] - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Amortized Cost
Due within one year	$ 3,621
Due after one year through five years	5,967
Due after five years through 10 years	3,899
Due after 10 years	4,463
Total having single maturity dates	17,950
Amortized cost	30,671	$ 29,492
Fair Value
Due within one year	3,624
Due after one year through five years	5,954
Due after five years through 10 years	3,870
Due after 10 years	5,006
Total having single maturity dates	18,454
Fair value	31,058	30,927
Residential mortgage backed securities [Member]
Amortized Cost
Without single maturity dates	6,373
Amortized cost	6,373	6,585
Fair Value
Without single maturity dates	6,329
Fair value	6,329	6,611
Commercial mortgage backed securities [Member]
Amortized Cost
Without single maturity dates	4,975
Amortized cost	4,975	4,362
Fair Value
Without single maturity dates	4,877
Fair value	4,877	4,374
Asset backed securities [Member]
Amortized Cost
Without single maturity dates	1,373
Amortized cost	1,373	1,549
Fair Value
Without single maturity dates	1,398
Fair value	$ 1,398	$ 1,580