Investments (AFS contractual maturity) (Details) - Ameriprise Financial [Member] - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Amortized cost
Due within one year	$ 2,608
Due after one year through five years	4,749
Due after five years through 10 years	2,817
Due after 10 years	4,143
Total having single maturity dates	14,317
Amortized cost	29,112	$ 30,671
Fair value
Due within one year	2,611
Due after one year through five years	4,913
Due after five years through 10 years	3,040
Due after 10 years	5,336
Total having single maturity dates	15,900
Fair value	30,967	31,058
Residential mortgage backed securities [Member]
Amortized cost
Without single maturity dates	8,020
Amortized cost	8,020	6,373
Fair value
Without single maturity dates	8,112
Fair value	8,112	6,329
Commercial mortgage backed securities [Member]
Amortized cost
Without single maturity dates	5,144
Amortized cost	5,144	4,975
Fair value
Without single maturity dates	5,275
Fair value	5,275	4,877
Asset backed securities [Member]
Amortized cost
Without single maturity dates	1,631
Amortized cost	1,631	1,373
Fair value
Without single maturity dates	1,680
Fair value	$ 1,680	$ 1,398