Fair Values of Assets and Liabilities Fair Value of Assets & Liabilities (Non-Recurring) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Assets and liabilities measured at fair value
Assets	$ 125,768	$ 121,943
RiverSource Tax Advantaged Investments Inc [Member] | VIEs, not primary beneficiary [Member]
Assets and liabilities measured at fair value
Assets	202	270
RiverSource Tax Advantaged Investments Inc [Member] | Nonrecurring basis [Member] | Level 3 [Member] | VIEs, not primary beneficiary [Member]
Assets and liabilities measured at fair value
Assets	$ 99	$ 158