Fair Value of Assets and Liabilities (Unobservable inputs) (Details 4) - Ameriprise Financial [Member] - Level 3 [Member] - Discounted cash flow [Member] $ in Millions		Sep. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)
Corporate debt securities [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Corporate debt securities, Available-for-sale, fair value		$ 794	$ 912
Corporate debt securities [Member] | Minimum [Member] | Yield/spread to U.S. Treasuries [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Corporate debt securities, Availabe-for-sale, measurement inputs		0.008	0.010
Corporate debt securities [Member] | Maximum [Member] | Yield/spread to U.S. Treasuries [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Corporate debt securities, Availabe-for-sale, measurement inputs		0.031	0.036
Corporate debt securities [Member] | Weighted average [Member] | Yield/spread to U.S. Treasuries [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Corporate debt securities, Availabe-for-sale, measurement inputs		0.013	0.015
Asset-backed securities [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset backed securities, fair value		$ 6	$ 6
Asset-backed securities [Member] | Annual short-term default rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset backed securities, measurement inputs		0.028	0.023
Asset-backed securities [Member] | Discount rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset backed securities, measurement inputs		0.110	0.115
Asset-backed securities [Member] | Minimum [Member] | Annual long-term default rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset backed securities, measurement inputs		0.025	0.025
Asset-backed securities [Member] | Minimum [Member] | Constant prepayment rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset backed securities, measurement inputs		0.050	0.050
Asset-backed securities [Member] | Minimum [Member] | Loss recovery [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset backed securities, measurement inputs		0.364	0.364
Asset-backed securities [Member] | Maximum [Member] | Annual long-term default rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset backed securities, measurement inputs		0.030	0.030
Asset-backed securities [Member] | Maximum [Member] | Constant prepayment rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset backed securities, measurement inputs		0.100	0.100
Asset-backed securities [Member] | Maximum [Member] | Loss recovery [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset backed securities, measurement inputs		0.636	0.636
Asset-backed securities [Member] | Weighted average [Member] | Annual long-term default rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset backed securities, measurement inputs		0.026	0.029
Asset-backed securities [Member] | Weighted average [Member] | Constant prepayment rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset backed securities, measurement inputs		0.100	0.100
Asset-backed securities [Member] | Weighted average [Member] | Loss recovery [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset backed securities, measurement inputs		0.636	0.636
IUL embedded derivatives [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivatives, fair value		$ 822	$ 628
IUL embedded derivatives [Member] | Nonperformance risk [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivatives, measurement inputs	[1]	0.0078	0.0119
Indexed annuity embedded derivatives [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivatives, fair value		$ 37	$ 14
Indexed annuity embedded derivatives [Member] | Nonperformance risk [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivatives, measurement inputs	[1]	0.0078	0.0119
Indexed annuity embedded derivatives [Member] | Minimum [Member] | Surrender rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivatives, measurement inputs		0.000	0.000
Indexed annuity embedded derivatives [Member] | Maximum [Member] | Surrender rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivatives, measurement inputs		0.500	0.500
GMWB and GMAB embedded derivatives [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivatives, fair value		$ 1,452	$ 328
GMWB and GMAB embedded derivatives [Member] | Nonperformance risk [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivatives, measurement inputs	[1]	0.0078	0.0119
GMWB and GMAB embedded derivatives [Member] | Minimum [Member] | Surrender rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivatives, measurement inputs		0.001	0.001
GMWB and GMAB embedded derivatives [Member] | Minimum [Member] | Utilization of guaranteed withdrawals [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivatives, measurement inputs	[2]	0.000	0.000
GMWB and GMAB embedded derivatives [Member] | Minimum [Member] | Market volatility [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivatives, measurement inputs	[3]	0.039	0.040
GMWB and GMAB embedded derivatives [Member] | Maximum [Member] | Surrender rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivatives, measurement inputs		0.735	0.734
GMWB and GMAB embedded derivatives [Member] | Maximum [Member] | Utilization of guaranteed withdrawals [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivatives, measurement inputs	[2]	0.360	0.360
GMWB and GMAB embedded derivatives [Member] | Maximum [Member] | Market volatility [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Embedded derivatives, measurement inputs	[3]	0.161	0.161
Contingent consideration liabilities [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contigent consideration liabilities, fair value		$ (26)	$ (30)
Contingent consideration liabilities [Member] | Discount rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent consideration liabilities, measurement input		9.00%	9.00%

[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.