Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities (Unobservable Inputs) (Details) - Ameriprise Financial [Member] - Fair Value, Inputs, Level 3 [Member] - Valuation Technique, Discounted Cash Flow [Member] $ in Millions		Dec. 31, 2020 USD ($)		Dec. 31, 2019 USD ($)
Corporate debt securities [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt Securities, Available-for-sale		$ 772		$ 749
Asset-backed Securities [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, Fair Value Disclosure		$ 3		$ 5
Asset-backed Securities [Member] | Probability of default, Short-term [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, Fair Value Disclosure, Measurement Input				0.033
Asset-backed Securities [Member] | Probability of default, Long-term [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, Fair Value Disclosure, Measurement Input				0.030
Asset-backed Securities [Member] | Discount Rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, Fair Value Disclosure, Measurement Input		0.130		0.120
Asset-backed Securities [Member] | Prepayment Rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, Fair Value Disclosure, Measurement Input		0.100
Asset-backed Securities [Member] | Loss Severity [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, Fair Value Disclosure, Measurement Input		0.636
IUL embedded derivatives [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net		$ 935		$ 881
IUL embedded derivatives [Member] | Nonperformance Risk [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input	[1]	0.65		0.65
Indexed annuity embedded derivatives [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net		$ 49		$ 43
Indexed annuity embedded derivatives [Member] | Nonperformance Risk [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input	[1]	0.65		0.65
GMWB and GMAB embedded derivatives [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net		$ 2,316		$ 763
GMWB and GMAB embedded derivatives [Member] | Nonperformance Risk [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input	[1]	0.65		0.65
Structured annuity embedded derivatives [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net		$ 70
Structured annuity embedded derivatives [Member] | Nonperformance Risk [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input	[1]	0.65
Contingent Consideration Liability [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Liabilities at fair value		$ 43		$ 44
Contingent Consideration Liability [Member] | Discount Rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Liabilities, Fair Value Disclosure, Measurement input				9.00%
Minimum [Member] | Corporate debt securities [Member] | Yield and Spread to Treasury [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt Securities, Available-for-sale, Measurement Input		0.010		0.008
Minimum [Member] | Asset-backed Securities [Member] | Probability of default, Short-term [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, Fair Value Disclosure, Measurement Input		0.029
Minimum [Member] | Asset-backed Securities [Member] | Probability of default, Long-term [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, Fair Value Disclosure, Measurement Input		0.035
Minimum [Member] | Asset-backed Securities [Member] | Prepayment Rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, Fair Value Disclosure, Measurement Input				0.050
Minimum [Member] | Asset-backed Securities [Member] | Loss Severity [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, Fair Value Disclosure, Measurement Input				0.364
Minimum [Member] | Indexed annuity embedded derivatives [Member] | Surrender Rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input		0.000		0.000
Minimum [Member] | GMWB and GMAB embedded derivatives [Member] | Surrender Rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input		0.001		0.001
Minimum [Member] | GMWB and GMAB embedded derivatives [Member] | Utilization of Guaranteed Withdrawals [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input	[2]	0.000		0.000
Minimum [Member] | GMWB and GMAB embedded derivatives [Member] | Price Volatility [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input	[3]	0.043		0.037
Minimum [Member] | Structured annuity embedded derivatives [Member] | Surrender Rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input		0.008
Minimum [Member] | Contingent Consideration Liability [Member] | Discount Rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Liabilities, Fair Value Disclosure, Measurement input		0.00%
Maximum [Member] | Corporate debt securities [Member] | Yield and Spread to Treasury [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt Securities, Available-for-sale, Measurement Input		0.033		0.028
Maximum [Member] | Asset-backed Securities [Member] | Probability of default, Short-term [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, Fair Value Disclosure, Measurement Input		0.030
Maximum [Member] | Asset-backed Securities [Member] | Probability of default, Long-term [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, Fair Value Disclosure, Measurement Input		0.045
Maximum [Member] | Asset-backed Securities [Member] | Prepayment Rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, Fair Value Disclosure, Measurement Input				0.100
Maximum [Member] | Asset-backed Securities [Member] | Loss Severity [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, Fair Value Disclosure, Measurement Input				0.636
Maximum [Member] | Indexed annuity embedded derivatives [Member] | Surrender Rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input		0.500		0.500
Maximum [Member] | GMWB and GMAB embedded derivatives [Member] | Surrender Rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input		0.735		0.735
Maximum [Member] | GMWB and GMAB embedded derivatives [Member] | Utilization of Guaranteed Withdrawals [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input	[2]	0.480		0.360
Maximum [Member] | GMWB and GMAB embedded derivatives [Member] | Price Volatility [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input	[3]	0.171		0.159
Maximum [Member] | Structured annuity embedded derivatives [Member] | Surrender Rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input		0.400
Maximum [Member] | Contingent Consideration Liability [Member] | Discount Rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Liabilities, Fair Value Disclosure, Measurement input		9.00%
Weighted Average [Member] | Corporate debt securities [Member] | Yield and Spread to Treasury [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt Securities, Available-for-sale, Measurement Input		0.015	[4]	0.012
Weighted Average [Member] | Asset-backed Securities [Member] | Probability of default, Short-term [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, Fair Value Disclosure, Measurement Input	[5]	0.029
Weighted Average [Member] | Asset-backed Securities [Member] | Probability of default, Long-term [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, Fair Value Disclosure, Measurement Input	[5]	0.038
Weighted Average [Member] | Asset-backed Securities [Member] | Discount Rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, Fair Value Disclosure, Measurement Input		0.130
Weighted Average [Member] | Asset-backed Securities [Member] | Prepayment Rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, Fair Value Disclosure, Measurement Input		0.100		0.100
Weighted Average [Member] | Asset-backed Securities [Member] | Loss Severity [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, Fair Value Disclosure, Measurement Input		0.636		0.636
Weighted Average [Member] | IUL embedded derivatives [Member] | Nonperformance Risk [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input	[1]	0.65
Weighted Average [Member] | Indexed annuity embedded derivatives [Member] | Nonperformance Risk [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input	[1]	0.65
Weighted Average [Member] | Indexed annuity embedded derivatives [Member] | Surrender Rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input	[6]	0.012
Weighted Average [Member] | GMWB and GMAB embedded derivatives [Member] | Nonperformance Risk [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input	[1]	0.65
Weighted Average [Member] | GMWB and GMAB embedded derivatives [Member] | Surrender Rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input	[6]	0.038
Weighted Average [Member] | GMWB and GMAB embedded derivatives [Member] | Utilization of Guaranteed Withdrawals [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input	[2],[7]	0.106
Weighted Average [Member] | GMWB and GMAB embedded derivatives [Member] | Price Volatility [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input	[3],[8]	0.110
Weighted Average [Member] | Structured annuity embedded derivatives [Member] | Nonperformance Risk [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input	[1]	0.65
Weighted Average [Member] | Structured annuity embedded derivatives [Member] | Surrender Rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input	[6]	0.009
Weighted Average [Member] | Contingent Consideration Liability [Member] | Discount Rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Liabilities, Fair Value Disclosure, Measurement input	[9]	3.10%

[1] The nonperformance risk is the spread added to the observable interest rates used in the valuation of the embedded derivatives.

[2] The utilization of guaranteed withdrawals represents the percentage of contractholders that will begin withdrawing in any given year.

[3] Market volatility is implied volatility of fund of funds and managed volatility funds.

[4] The weighted average for the spread to U.S. Treasuries for corporate debt securities (private placements) is weighted based on the security’s market value as a percentage of the aggregate market value of the securities.

[5] The weighted average annual default rates of asset backed securities is weighted based on the security’s market value as a percentage of the aggregate market value of the securities.

[6] The weighted average surrender rate is weighted based on the benefit base of each contract and represents the average assumption in the current year including the effect of a dynamic surrender formula.

[7] The weighted average utilization rate represents the average assumption for the current year, weighting each policy evenly. The calculation excludes policies that have already started taking withdrawals.

[8] The weighted average market volatility represents the average volatility across all contracts, weighted by the size of the guaranteed benefit.

[9] The weighted average discount rate represents the average discount rate across all contingent consideration liabilities, weighted based on the size of the contingent consideration liability.