Investments (AFS contractual maturity) (Details 8) - Ameriprise Financial [Member] - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Amortized cost
Due within one year	$ 3,224
Due after one year through five years	6,425
Due after five years through 10 years	3,591
Due after 10 years	4,273
Total having single maturity dates	17,513
Amortized cost	29,441	$ 29,492
Fair value
Due within one year	3,247
Due after one year through five years	6,507
Due after five years through 10 years	3,612
Due after 10 years	5,118
Total having single maturity dates	18,484
Fair value	30,319	30,927
Residential mortgage backed securities [Member]
Amortized cost
Without single maturity dates	6,031
Amortized cost	6,031	6,585
Fair value
Without single maturity dates	5,992
Fair value	5,992	6,611
Commercial mortgage backed securities [Member]
Amortized cost
Without single maturity dates	4,395
Amortized cost	4,395	4,362
Fair value
Without single maturity dates	4,320
Fair value	4,320	4,374
Asset backed securities [Member]
Amortized cost
Without single maturity dates	1,502
Amortized cost	1,502	1,549
Fair value
Without single maturity dates	1,523
Fair value	$ 1,523	$ 1,580