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Fair Values of Assets and Liabilities - Significant Unobservable inputs (Details)
$ in Millions
Sep. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Significant unobservable inputs used in fair value measurements    
Liabilities: embedded derivatives, net $ 4,862 $ 3,523
Ameriprise Financial    
Significant unobservable inputs used in fair value measurements    
Available-for-Sale securities, at fair value 52,574 52,153
Ameriprise Financial | Corporate debt securities    
Significant unobservable inputs used in fair value measurements    
Available-for-Sale securities, at fair value 15,292 13,999
Ameriprise Financial | Asset backed securities    
Significant unobservable inputs used in fair value measurements    
Available-for-Sale securities, at fair value 4,310 6,442
Ameriprise Financial | Level 3 | Corporate debt securities    
Significant unobservable inputs used in fair value measurements    
Available-for-Sale securities, at fair value 731 583
Ameriprise Financial | Level 3 | Asset backed securities    
Significant unobservable inputs used in fair value measurements    
Available-for-Sale securities, at fair value 1 1
Ameriprise Financial | Level 3 | Fixed deferred indexed annuities ceded embedded derivatives    
Significant unobservable inputs used in fair value measurements    
Receivables: embedded derivatives 59 55
Ameriprise Financial | Level 3 | Fixed deferred indexed annuities embedded derivatives    
Significant unobservable inputs used in fair value measurements    
Liabilities: embedded derivatives 58 53
Ameriprise Financial | Level 3 | IUL embedded derivatives    
Significant unobservable inputs used in fair value measurements    
Liabilities: embedded derivatives 1,063 1,002
Ameriprise Financial | Level 3 | Structured variable annuity embedded derivatives    
Significant unobservable inputs used in fair value measurements    
Liabilities: embedded derivatives, net 3,735 2,461
Ameriprise Financial | Level 3 | Contingent consideration liabilities    
Significant unobservable inputs used in fair value measurements    
Other liabilities, fair value $ 64 $ 68
Ameriprise Financial | Level 3 | Discounted cash flow | Corporate debt securities | Minimum | Yield/spread to U.S. Treasuries    
Significant unobservable inputs used in fair value measurements    
Available-for-sale securities, measurement inputs 0.009 0.008
Ameriprise Financial | Level 3 | Discounted cash flow | Corporate debt securities | Maximum | Yield/spread to U.S. Treasuries    
Significant unobservable inputs used in fair value measurements    
Available-for-sale securities, measurement inputs 0.016 0.017
Ameriprise Financial | Level 3 | Discounted cash flow | Corporate debt securities | Weighted Average | Yield/spread to U.S. Treasuries    
Significant unobservable inputs used in fair value measurements    
Available-for-sale securities, measurement inputs 0.011 0.011
Ameriprise Financial | Level 3 | Discounted cash flow | Asset backed securities | Annual short-term default rate    
Significant unobservable inputs used in fair value measurements    
Available-for-sale securities, measurement inputs 0.030 0.035
Ameriprise Financial | Level 3 | Discounted cash flow | Asset backed securities | Annual long-term default rate    
Significant unobservable inputs used in fair value measurements    
Available-for-sale securities, measurement inputs 0.035 0.035
Ameriprise Financial | Level 3 | Discounted cash flow | Asset backed securities | Discount rate    
Significant unobservable inputs used in fair value measurements    
Available-for-sale securities, measurement inputs 0.150 0.153
Ameriprise Financial | Level 3 | Discounted cash flow | Asset backed securities | Constant prepayment rate    
Significant unobservable inputs used in fair value measurements    
Available-for-sale securities, measurement inputs 0.200 0.200
Ameriprise Financial | Level 3 | Discounted cash flow | Asset backed securities | Loss recovery    
Significant unobservable inputs used in fair value measurements    
Available-for-sale securities, measurement inputs 0.600 0.600
Ameriprise Financial | Level 3 | Discounted cash flow | Asset backed securities | Weighted Average | Annual short-term default rate    
Significant unobservable inputs used in fair value measurements    
Available-for-sale securities, measurement inputs 0.030 0.035
Ameriprise Financial | Level 3 | Discounted cash flow | Asset backed securities | Weighted Average | Annual long-term default rate    
Significant unobservable inputs used in fair value measurements    
Available-for-sale securities, measurement inputs 0.035 0.035
Ameriprise Financial | Level 3 | Discounted cash flow | Asset backed securities | Weighted Average | Discount rate    
Significant unobservable inputs used in fair value measurements    
Available-for-sale securities, measurement inputs 0.150 0.153
Ameriprise Financial | Level 3 | Discounted cash flow | Asset backed securities | Weighted Average | Constant prepayment rate    
Significant unobservable inputs used in fair value measurements    
Available-for-sale securities, measurement inputs 0.200 0.200
Ameriprise Financial | Level 3 | Discounted cash flow | Asset backed securities | Weighted Average | Loss recovery    
Significant unobservable inputs used in fair value measurements    
Available-for-sale securities, measurement inputs 0.600 0.600
Ameriprise Financial | Level 3 | Discounted cash flow | Fixed deferred indexed annuities ceded embedded derivatives | Minimum | Surrender rate    
Significant unobservable inputs used in fair value measurements    
Embedded derivative asset, measurement input 0.002 0.000
Ameriprise Financial | Level 3 | Discounted cash flow | Fixed deferred indexed annuities ceded embedded derivatives | Maximum | Surrender rate    
Significant unobservable inputs used in fair value measurements    
Embedded derivative asset, measurement input 0.938 0.891
Ameriprise Financial | Level 3 | Discounted cash flow | Fixed deferred indexed annuities ceded embedded derivatives | Weighted Average | Surrender rate    
Significant unobservable inputs used in fair value measurements    
Embedded derivative asset, measurement input 0.072 0.106
Ameriprise Financial | Level 3 | Discounted cash flow | Fixed deferred indexed annuities embedded derivatives | Nonperformance risk    
Significant unobservable inputs used in fair value measurements    
Embedded derivative liability, measurement input 0.0060 0.0065
Ameriprise Financial | Level 3 | Discounted cash flow | Fixed deferred indexed annuities embedded derivatives | Minimum | Surrender rate    
Significant unobservable inputs used in fair value measurements    
Embedded derivative liability, measurement input 0.002 0.000
Ameriprise Financial | Level 3 | Discounted cash flow | Fixed deferred indexed annuities embedded derivatives | Maximum | Surrender rate    
Significant unobservable inputs used in fair value measurements    
Embedded derivative liability, measurement input 0.938 0.891
Ameriprise Financial | Level 3 | Discounted cash flow | Fixed deferred indexed annuities embedded derivatives | Weighted Average | Surrender rate    
Significant unobservable inputs used in fair value measurements    
Embedded derivative liability, measurement input 0.072 0.106
Ameriprise Financial | Level 3 | Discounted cash flow | Fixed deferred indexed annuities embedded derivatives | Weighted Average | Nonperformance risk    
Significant unobservable inputs used in fair value measurements    
Embedded derivative liability, measurement input 0.0060 0.0065
Ameriprise Financial | Level 3 | Discounted cash flow | IUL embedded derivatives | Nonperformance risk    
Significant unobservable inputs used in fair value measurements    
Embedded derivative liability, measurement input 0.0060 0.0065
Ameriprise Financial | Level 3 | Discounted cash flow | IUL embedded derivatives | Weighted Average | Nonperformance risk    
Significant unobservable inputs used in fair value measurements    
Embedded derivative liability, measurement input 0.0060 0.0065
Ameriprise Financial | Level 3 | Discounted cash flow | Structured variable annuity embedded derivatives | Nonperformance risk    
Significant unobservable inputs used in fair value measurements    
Embedded derivative liability, measurement input 0.0060 0.0065
Ameriprise Financial | Level 3 | Discounted cash flow | Structured variable annuity embedded derivatives | Minimum | Surrender rate    
Significant unobservable inputs used in fair value measurements    
Embedded derivative liability, measurement input 0.005 0.005
Ameriprise Financial | Level 3 | Discounted cash flow | Structured variable annuity embedded derivatives | Maximum | Surrender rate    
Significant unobservable inputs used in fair value measurements    
Embedded derivative liability, measurement input 0.750 0.750
Ameriprise Financial | Level 3 | Discounted cash flow | Structured variable annuity embedded derivatives | Weighted Average | Surrender rate    
Significant unobservable inputs used in fair value measurements    
Embedded derivative liability, measurement input 0.020 0.017
Ameriprise Financial | Level 3 | Discounted cash flow | Structured variable annuity embedded derivatives | Weighted Average | Nonperformance risk    
Significant unobservable inputs used in fair value measurements    
Embedded derivative liability, measurement input 0.0060 0.0065
Ameriprise Financial | Level 3 | Discounted cash flow | Contingent consideration liabilities | Minimum | Discount rate    
Significant unobservable inputs used in fair value measurements    
Other liabilities, measurement input 0.000 0.000
Ameriprise Financial | Level 3 | Discounted cash flow | Contingent consideration liabilities | Maximum | Discount rate    
Significant unobservable inputs used in fair value measurements    
Other liabilities, measurement input 0.105 0.105
Ameriprise Financial | Level 3 | Discounted cash flow | Contingent consideration liabilities | Weighted Average | Discount rate    
Significant unobservable inputs used in fair value measurements    
Other liabilities, measurement input 0.027 0.033