Investments Investments (EITF info-Fair value) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Fair Value [Line Items]
investmentgradeAFSsecuritieswithgrossunrealizedlosses	81.00%
Ameriprise Financial [Member]
Fair Value [Line Items]
Less than 12 months	$ 4,655	$ 6,637
12 months or more	982	1,936
Total	5,637	8,573
Ameriprise Financial [Member] | Corporate debt securities [Member]
Fair Value [Line Items]
Less than 12 months	817	66
12 months or more	24	173
Total	841	239
Ameriprise Financial [Member] | Residential mortgage backed securities [Member]
Fair Value [Line Items]
Less than 12 months	1,677	4,328
12 months or more	434	1,164
Total	2,111	5,492
Ameriprise Financial [Member] | Commercial mortgage backed securities [Member]
Fair Value [Line Items]
Less than 12 months	1,190	1,622
12 months or more	326	314
Total	1,516	1,936
Ameriprise Financial [Member] | Asset backed securities [Member]
Fair Value [Line Items]
Less than 12 months	932	598
12 months or more	184	213
Total	1,116	811
Ameriprise Financial [Member] | State and municipal obligations [Member]
Fair Value [Line Items]
Less than 12 months	14	23
12 months or more	4	57
Total	18	80
Ameriprise Financial [Member] | Foreign government bonds and obligations [Member]
Fair Value [Line Items]
Less than 12 months	25	0
12 months or more	10	15
Total	$ 35	$ 15