Investments (AFS contractual maturity) (Details 8) - Ameriprise Financial [Member] - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Amortized cost
Due within one year	$ 3,033
Due after one year through five years	6,323
Due after five years through 10 years	3,789
Due after 10 years	4,429
Total having single maturity dates	17,574
Amortized cost	29,852	$ 29,492
Fair value
Due within one year	3,053
Due after one year through five years	6,348
Due after five years through 10 years	3,762
Due after 10 years	5,151
Total having single maturity dates	18,314
Fair value	30,459	30,927
Residential mortgage backed securities [Member]
Amortized cost
Without single maturity dates	6,039
Amortized cost	6,039	6,585
Fair value
Without single maturity dates	5,986
Fair value	5,986	6,611
Commercial mortgage backed securities [Member]
Amortized cost
Without single maturity dates	4,685
Amortized cost	4,685	4,362
Fair value
Without single maturity dates	4,584
Fair value	4,584	4,374
Asset backed securities [Member]
Amortized cost
Without single maturity dates	1,554
Amortized cost	1,554	1,549
Fair value
Without single maturity dates	1,575
Fair value	$ 1,575	$ 1,580