Fair Value of Assets and Liabilities Fair Vaues of Assets and Liabilities (Recurring) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020		Dec. 31, 2019
Liabilities
Individual contracts in a liability position	[1],[2]	$ 7,693		$ 5,229
Individual contracts in an asset position	[3]	5,870		4,361
Cumulative increase(decrease) in embedded derivatives due to nonperformance		(727)		(502)
GMWB and GMAB embedded derivatives [Member]
Liabilities
Individual contracts in a liability position		2,400		981
Individual contracts in an asset position		67		218
Ameriprise Financial [Member]
Assets
Available-for-sale securities		36,283		33,129
Separate account assets measured at NAV		92,611		87,488
Investments and cash equivalents segregated for regulatory purposes		2,558		2,386
Ameriprise Financial [Member] | Corporate debt securities [Member]
Assets
Available-for-sale securities		13,674		12,187
Ameriprise Financial [Member] | Residential mortgage backed securities [Member]
Assets
Available-for-sale securities		10,029		10,029
Ameriprise Financial [Member] | Commercial mortgage backed securities [Member]
Assets
Available-for-sale securities		6,088		5,563
Ameriprise Financial [Member] | Asset backed securities [Member]
Assets
Available-for-sale securities		3,329		2,006
Ameriprise Financial [Member] | State and municipal obligations [Member]
Assets
Available-for-sale securities		1,384		1,367
Ameriprise Financial [Member] | U.S. government and agencies obligations [Member]
Assets
Available-for-sale securities		1,456		1,680
Ameriprise Financial [Member] | Foreign government bonds and obligations [Member]
Assets
Available-for-sale securities		262		271
Ameriprise Financial [Member] | Recurring basis [Member]
Assets
Cash equivalents		5,441		3,191
Available-for-sale securities		36,283		33,129
Equity securities				1
Investments measured at NAV	[4]	8		6
Trading securities		88		38
Separate account assets measured at NAV	[4]	92,611		87,488
Investments and cash equivalents segregated for regulatory purposes		600		14
Other assets		5,870		4,361
Total assets at fair value		140,901		128,228
Liabilities
Policyholder account balances, future policy benefits and claims		3,373	[5]	1,690	[6]
Customer deposits		8		14
Other liabilities		4,360		3,579
Total liabilities at fair value		7,741		5,283
Ameriprise Financial [Member] | Recurring basis [Member] | Other liabilities [Member]
Liabilities
Other liabilities		48		54
Ameriprise Financial [Member] | Recurring basis [Member] | Interest rate derivative contracts [Member]
Assets
Other assets		1,755		1,455
Liabilities
Other liabilities		734		418
Ameriprise Financial [Member] | Recurring basis [Member] | Equity derivate dontracts [Member]
Assets
Other assets		4,090		2,884
Liabilities
Other liabilities		3,571		3,098
Ameriprise Financial [Member] | Recurring basis [Member] | Credit Risk Contract [Member]
Assets
Other assets		2		4
Liabilities
Other liabilities		1
Ameriprise Financial [Member] | Recurring basis [Member] | Foreign exchange derivative contracts [Member]
Assets
Other assets		23		18
Liabilities
Other liabilities		6		9
Ameriprise Financial [Member] | Recurring basis [Member] | Indexed annuity embedded derivatives [Member]
Liabilities
Policyholder account balances, future policy benefits and claims		52		46
Ameriprise Financial [Member] | Recurring basis [Member] | IUL embedded derivatives [Member]
Liabilities
Policyholder account balances, future policy benefits and claims		935		881
Ameriprise Financial [Member] | Recurring basis [Member] | GMWB and GMAB embedded derivatives [Member]
Liabilities
Policyholder account balances, future policy benefits and claims		2,316	[7]	763	[8]
Ameriprise Financial [Member] | Recurring basis [Member] | Structured annuity embedded derivatives [Member]
Liabilities
Policyholder account balances, future policy benefits and claims		70
Ameriprise Financial [Member] | Recurring basis [Member] | Corporate debt securities [Member]
Assets
Available-for-sale securities		13,674		12,187
Ameriprise Financial [Member] | Recurring basis [Member] | Residential mortgage backed securities [Member]
Assets
Available-for-sale securities		10,029		10,029
Ameriprise Financial [Member] | Recurring basis [Member] | Commercial mortgage backed securities [Member]
Assets
Available-for-sale securities		6,088		5,563
Ameriprise Financial [Member] | Recurring basis [Member] | Asset backed securities [Member]
Assets
Available-for-sale securities		3,329		2,006
Ameriprise Financial [Member] | Recurring basis [Member] | State and municipal obligations [Member]
Assets
Available-for-sale securities		1,384		1,367
Ameriprise Financial [Member] | Recurring basis [Member] | U.S. government and agencies obligations [Member]
Assets
Available-for-sale securities		1,456		1,680
Ameriprise Financial [Member] | Recurring basis [Member] | Foreign government bonds and obligations [Member]
Assets
Available-for-sale securities		262		271
Ameriprise Financial [Member] | Recurring basis [Member] | Other investments [Member]
Assets
Available-for-sale securities		61		26
Ameriprise Financial [Member] | Recurring basis [Member] | Level 1 [Member]
Assets
Cash equivalents		2,935		267
Available-for-sale securities		1,456		1,680
Equity securities				1
Trading securities		61		12
Investments and cash equivalents segregated for regulatory purposes		600		14
Other assets		410		163
Total assets at fair value		5,462		2,137
Liabilities
Other liabilities		187		43
Total liabilities at fair value		187		43
Ameriprise Financial [Member] | Recurring basis [Member] | Level 1 [Member] | Other liabilities [Member]
Liabilities
Other liabilities		2		6
Ameriprise Financial [Member] | Recurring basis [Member] | Level 1 [Member] | Interest rate derivative contracts [Member]
Assets
Other assets		1
Ameriprise Financial [Member] | Recurring basis [Member] | Level 1 [Member] | Equity derivate dontracts [Member]
Assets
Other assets		408		162
Liabilities
Other liabilities		183		36
Ameriprise Financial [Member] | Recurring basis [Member] | Level 1 [Member] | Foreign exchange derivative contracts [Member]
Assets
Other assets		1		1
Liabilities
Other liabilities		2		1
Ameriprise Financial [Member] | Recurring basis [Member] | Level 1 [Member] | U.S. government and agencies obligations [Member]
Assets
Available-for-sale securities		1,456		1,680
Ameriprise Financial [Member] | Recurring basis [Member] | Level 2 [Member]
Assets
Cash equivalents		2,506		2,924
Available-for-sale securities		34,014		30,663
Trading securities		27		26
Other assets		5,460		4,198
Total assets at fair value		42,007		37,811
Liabilities
Policyholder account balances, future policy benefits and claims		3		3
Customer deposits		8		14
Other liabilities		4,130		3,492
Total liabilities at fair value		4,141		3,509
Ameriprise Financial [Member] | Recurring basis [Member] | Level 2 [Member] | Other liabilities [Member]
Liabilities
Other liabilities		3		4
Ameriprise Financial [Member] | Recurring basis [Member] | Level 2 [Member] | Interest rate derivative contracts [Member]
Assets
Other assets		1,754		1,455
Liabilities
Other liabilities		734		418
Ameriprise Financial [Member] | Recurring basis [Member] | Level 2 [Member] | Equity derivate dontracts [Member]
Assets
Other assets		3,682		2,722
Liabilities
Other liabilities		3,388		3,062
Ameriprise Financial [Member] | Recurring basis [Member] | Level 2 [Member] | Credit Risk Contract [Member]
Assets
Other assets		2		4
Liabilities
Other liabilities		1
Ameriprise Financial [Member] | Recurring basis [Member] | Level 2 [Member] | Foreign exchange derivative contracts [Member]
Assets
Other assets		22		17
Liabilities
Other liabilities		4		8
Ameriprise Financial [Member] | Recurring basis [Member] | Level 2 [Member] | Indexed annuity embedded derivatives [Member]
Liabilities
Policyholder account balances, future policy benefits and claims		3		3
Ameriprise Financial [Member] | Recurring basis [Member] | Level 2 [Member] | Corporate debt securities [Member]
Assets
Available-for-sale securities		12,902		11,437
Ameriprise Financial [Member] | Recurring basis [Member] | Level 2 [Member] | Residential mortgage backed securities [Member]
Assets
Available-for-sale securities		10,020		10,012
Ameriprise Financial [Member] | Recurring basis [Member] | Level 2 [Member] | Commercial mortgage backed securities [Member]
Assets
Available-for-sale securities		6,088		5,563
Ameriprise Financial [Member] | Recurring basis [Member] | Level 2 [Member] | Asset backed securities [Member]
Assets
Available-for-sale securities		3,297		1,987
Ameriprise Financial [Member] | Recurring basis [Member] | Level 2 [Member] | State and municipal obligations [Member]
Assets
Available-for-sale securities		1,384		1,367
Ameriprise Financial [Member] | Recurring basis [Member] | Level 2 [Member] | Foreign government bonds and obligations [Member]
Assets
Available-for-sale securities		262		271
Ameriprise Financial [Member] | Recurring basis [Member] | Level 2 [Member] | Other investments [Member]
Assets
Available-for-sale securities		61		26
Ameriprise Financial [Member] | Recurring basis [Member] | Level 3 [Member]
Assets
Available-for-sale securities		813		786
Total assets at fair value		813		786
Liabilities
Policyholder account balances, future policy benefits and claims		3,370		1,687
Other liabilities		43		44
Total liabilities at fair value		3,413		1,731
Ameriprise Financial [Member] | Recurring basis [Member] | Level 3 [Member] | Other liabilities [Member]
Liabilities
Other liabilities		43		44
Ameriprise Financial [Member] | Recurring basis [Member] | Level 3 [Member] | Indexed annuity embedded derivatives [Member]
Liabilities
Policyholder account balances, future policy benefits and claims		49
Ameriprise Financial [Member] | Recurring basis [Member] | Level 3 [Member] | IUL embedded derivatives [Member]
Liabilities
Policyholder account balances, future policy benefits and claims		935
Ameriprise Financial [Member] | Recurring basis [Member] | Level 3 [Member] | GMWB and GMAB embedded derivatives [Member]
Liabilities
Policyholder account balances, future policy benefits and claims		2,316
Ameriprise Financial [Member] | Recurring basis [Member] | Level 3 [Member] | Structured annuity embedded derivatives [Member]
Liabilities
Policyholder account balances, future policy benefits and claims		70
Ameriprise Financial [Member] | Recurring basis [Member] | Level 3 [Member] | Corporate debt securities [Member]
Assets
Available-for-sale securities		772		750
Ameriprise Financial [Member] | Recurring basis [Member] | Level 3 [Member] | Residential mortgage backed securities [Member]
Assets
Available-for-sale securities		9		17
Ameriprise Financial [Member] | Recurring basis [Member] | Level 3 [Member] | Asset backed securities [Member]
Assets
Available-for-sale securities		$ 32		$ 19

[1] The fair value of freestanding derivative liabilities is included in Other liabilities on the Consolidated Balance Sheets. The fair value of GMWB and GMAB, IUL, and fixed deferred indexed annuity and structured variable annuity embedded derivatives is included in Policyholder account balances, future policy benefits and claims on the Consolidated Balance Sheets. The fair value of the SMC embedded derivative liability is included in Customer deposits on the Consolidated Balance Sheets.

[2] The fair value of the Company’s derivative liabilities after considering the effects of master netting arrangements, cash collateral held by the same counterparty and the fair value of net embedded derivatives was $3.7 billion and $2.3 billion as of December 31, 2020 and 2019, respectively. See Note 16 for additional information related to master netting arrangements and cash collateral.

[3] The fair value of freestanding derivative assets is included in Other assets on the Consolidated Balance Sheets.

[4] Amounts are comprised of certain financial instruments that are measured at fair value using the NAV per share (or its equivalent) as a practical expedient and have not been classified in the fair value hierarchy.

[5] The Company’s adjustment for nonperformance risk resulted in a $727 million cumulative decrease to the embedded derivatives as of December 31, 2020.

[6] The Company’s adjustment for nonperformance risk resulted in a $502 million cumulative decrease to the embedded derivatives as of December 31, 2019.

[7] The fair value of the GMWB and GMAB embedded derivatives included $2.4 billion of individual contracts in a liability position and $67 million of individual contracts in an asset position (recorded as a contra liability) as of December 31, 2020.

[8] The fair value of the GMWB and GMAB embedded derivatives included $981 million of individual contracts in a liability position and $218 million of individual contracts in an asset position (recorded as a contra liability) as of December 31, 2019.