Fair Value of Assets and Liabilities (Unobservable inputs) (Details 4) - Ameriprise Financial [Member] - Discounted cash flow [Member] - USD ($) $ in Millions		3 Months Ended	12 Months Ended
		Mar. 31, 2018	Dec. 31, 2017
IUL embedded derivatives [Member]
Fair values of assets and liabilities
Liabilities at fair value		$ 585	$ 601
Nonperformance risk (as a percent)	[1]	0.88%	0.71%
Indexed annuity embedded derivatives [Member]
Fair values of assets and liabilities
Liabilities at fair value		$ 3
Nonperformance risk (as a percent)	[1]	0.88%
Indexed annuity embedded derivatives [Member] | Minimum [Member]
Fair values of assets and liabilities
Surrender rate (as a percent)		0.00%
Indexed annuity embedded derivatives [Member] | Maximum [Member]
Fair values of assets and liabilities
Surrender rate (as a percent)		50.00%
GMWB and GMAB embedded derivatives [Member]
Fair values of assets and liabilities
Liabilities at fair value		$ (329)	$ (49)
Nonperformance risk (as a percent)	[1]	0.88%	0.71%
GMWB and GMAB embedded derivatives [Member] | Minimum [Member]
Fair values of assets and liabilities
Surrender rate (as a percent)		0.10%	0.10%
Utilization of guaranteed withdrawals (as a percent)	[2]	0.00%	0.00%
Market volatility (as a percent)	[3]	4.00%	3.70%
GMWB and GMAB embedded derivatives [Member] | Maximum [Member]
Fair values of assets and liabilities
Surrender rate (as a percent)		74.70%	74.70%
Utilization of guaranteed withdrawals (as a percent)	[2]	42.00%	42.00%
Market volatility (as a percent)	[3]	16.20%	16.10%
Contingent consideration liabilities [Member]
Fair values of assets and liabilities
Discount rate		9.00%	9.00%
Liabilities at fair value		$ 28	$ 28
Corporate debt securities [Member]
Fair values of assets and liabilities
Assets at fair value		$ 1,093	$ 1,138
Corporate debt securities [Member] | Minimum [Member]
Fair values of assets and liabilities
Yield/spread to U.S. Treasuries (as a percent)		0.80%	0.70%
Corporate debt securities [Member] | Maximum [Member]
Fair values of assets and liabilities
Yield/spread to U.S. Treasuries (as a percent)		2.20%	2.30%
Corporate debt securities [Member] | Weighted average [Member]
Fair values of assets and liabilities
Yield/spread to U.S. Treasuries (as a percent)		1.10%	1.10%
Asset-backed Securities [Member]
Fair values of assets and liabilities
Assets at fair value		$ 7	$ 7
Annual short-term default rate		2.30%	3.80%
Discount rate		11.50%	10.50%
Asset-backed Securities [Member] | Minimum [Member]
Fair values of assets and liabilities
Annual long-term default rate		2.50%	2.50%
Constant prepayment rate		5.00%	5.00%
Loss recovery (as a percent)		36.40%	36.40%
Asset-backed Securities [Member] | Maximum [Member]
Fair values of assets and liabilities
Annual long-term default rate		3.50%	3.00%
Constant prepayment rate		10.00%	10.00%
Loss recovery (as a percent)		63.60%	63.60%
Asset-backed Securities [Member] | Weighted average [Member]
Fair values of assets and liabilities
Annual long-term default rate		3.20%	2.70%
Constant prepayment rate		10.00%	9.90%
Loss recovery (as a percent)		63.50%	63.20%

[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.