Investments (AFS contractual maturity) (Details 8) - Ameriprise Financial [Member] - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Amortized cost
Due within one year	$ 3,251
Due after one year through five years	6,187
Due after five years through 10 years	3,912
Due after 10 years	4,511
Total having single maturity dates	17,861
Amortized cost	30,343	$ 29,492
Fair value
Due within one year	3,265
Due after one year through five years	6,192
Due after five years through 10 years	3,882
Due after 10 years	5,204
Total having single maturity dates	18,543
Fair value	30,840	30,927
Residential mortgage backed securities [Member]
Amortized cost
Without single maturity dates	6,310
Amortized cost	6,310	6,585
Fair value
Without single maturity dates	6,225
Fair value	6,225	6,611
Commercial mortgage backed securities [Member]
Amortized cost
Without single maturity dates	4,713
Amortized cost	4,713	4,362
Fair value
Without single maturity dates	4,595
Fair value	4,595	4,374
Asset backed securities [Member]
Amortized cost
Without single maturity dates	1,459
Amortized cost	1,459	1,549
Fair value
Without single maturity dates	1,477
Fair value	$ 1,477	$ 1,580