Investments Investments (EITF info-Fair value) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Fair Value [Line Items]
investmentgradeAFSsecuritieswithgrossunrealizedlosses	85.00%
Ameriprise Financial [Member]
Fair Value [Line Items]
Less than 12 months	$ 4,999	$ 6,637
12 months or more	1,165	1,936
Total	6,164	8,573
Ameriprise Financial [Member] | Corporate debt securities [Member]
Fair Value [Line Items]
Less than 12 months	407	66
12 months or more	40	173
Total	447	239
Ameriprise Financial [Member] | Residential mortgage backed securities [Member]
Fair Value [Line Items]
Less than 12 months	1,774	4,328
12 months or more	800	1,164
Total	2,574	5,492
Ameriprise Financial [Member] | Commercial mortgage backed securities [Member]
Fair Value [Line Items]
Less than 12 months	1,433	1,622
12 months or more	140	314
Total	1,573	1,936
Ameriprise Financial [Member] | Asset backed securities [Member]
Fair Value [Line Items]
Less than 12 months	1,308	598
12 months or more	171	213
Total	1,479	811
Ameriprise Financial [Member] | State and municipal obligations [Member]
Fair Value [Line Items]
Less than 12 months	55	23
12 months or more	4	57
Total	59	80
Ameriprise Financial [Member] | Foreign government bonds and obligations [Member]
Fair Value [Line Items]
Less than 12 months	22	0
12 months or more	10	15
Total	$ 32	$ 15