Fair Values of Assets and Liabilities (Recurring) (Details) - USD ($) $ in Millions		9 Months Ended		12 Months Ended
		Sep. 30, 2020		Dec. 31, 2019
Liabilities
Individual contracts in a liability position	[1],[2]	$ 7,882		$ 5,229
Individual contracts in an asset position	[3]	5,488		4,361
Cumulative increase (decrease) in embedded derivatives of adjustment for nonperformance risk		(1,000)		(502)
GMWB and GMAB embedded derivatives [Member]
Liabilities
Individual contracts in a liability position		3,000		981
Individual contracts in an asset position		36		218
Ameriprise Financial [Member]
Assets
Available-for-Sale securities		35,959		33,129
Separate account assets at NAV		86,128		87,488
Investments segregated for regulatory purposes		2,551		2,386
Ameriprise Financial [Member] | Corporate debt securities [Member]
Assets
Available-for-Sale securities		13,022		12,187
Ameriprise Financial [Member] | Residential mortgage backed securities [Member]
Assets
Available-for-Sale securities		10,258		10,029
Ameriprise Financial [Member] | Commercial mortgage backed securities [Member]
Assets
Available-for-Sale securities		6,212		5,563
Ameriprise Financial [Member] | Asset backed securities [Member]
Assets
Available-for-Sale securities		3,088		2,006
Ameriprise Financial [Member] | State and municipal obligations [Member]
Assets
Available-for-Sale securities		1,380		1,367
Ameriprise Financial [Member] | U.S. government and agencies obligations [Member]
Assets
Available-for-Sale securities		1,680		1,680
Ameriprise Financial [Member] | Foreign government bonds and obligations [Member]
Assets
Available-for-Sale securities		267		271
Ameriprise Financial [Member] | Recurring basis [Member]
Assets
Cash equivalents		6,286		3,191
Available-for-Sale securities		35,959		33,129
Equity securities				1
Equity securities at NAV	[4]	7		6
Trading and other securities at fair value		35		38
Separate account assets at NAV	[4]	86,128		87,488
Investments segregated for regulatory purposes				14
Other assets		5,488		4,361
Total assets at fair value		133,903		128,228
Liabilities
Policyholder account balances, future policy benefits and claims		3,925	[5]	1,690	[6]
Customer deposits		8		14
Other liabilities		3,998		3,579
Total liabilities at fair value		7,931		5,283
Ameriprise Financial [Member] | Recurring basis [Member] | Other liabilities [Member]
Liabilities
Other liabilities		49		54
Ameriprise Financial [Member] | Recurring basis [Member] | Fixed deferred indexed annuity embedded derivatives [Member]
Liabilities
Policyholder account balances, future policy benefits and claims		47		46
Ameriprise Financial [Member] | Recurring basis [Member] | IUL embedded derivatives [Member]
Liabilities
Policyholder account balances, future policy benefits and claims		926		881
Ameriprise Financial [Member] | Recurring basis [Member] | GMWB and GMAB embedded derivatives [Member]
Liabilities
Policyholder account balances, future policy benefits and claims		2,943	[7]	763	[8]
Ameriprise Financial [Member] | Recurring basis [Member] | Structured annuity embedded derivatives [Member]
Liabilities
Policyholder account balances, future policy benefits and claims		9
Ameriprise Financial [Member] | Recurring basis [Member] | Interest rate derivative contracts [Member]
Assets
Other assets		2,015		1,455
Liabilities
Other liabilities		934		418
Ameriprise Financial [Member] | Recurring basis [Member] | Equity derivative contracts [Member]
Assets
Other assets		3,432		2,884
Liabilities
Other liabilities		3,008		3,098
Ameriprise Financial [Member] | Recurring basis [Member] | Credit derivative contracts [Member]
Assets
Other assets		5		4
Ameriprise Financial [Member] | Recurring basis [Member] | Foreign exchange derivative contracts [Member]
Assets
Other assets		36		18
Liabilities
Other liabilities		7		9
Ameriprise Financial [Member] | Recurring basis [Member] | Corporate debt securities [Member]
Assets
Available-for-Sale securities		13,022		12,187
Ameriprise Financial [Member] | Recurring basis [Member] | Residential mortgage backed securities [Member]
Assets
Available-for-Sale securities		10,258		10,029
Ameriprise Financial [Member] | Recurring basis [Member] | Commercial mortgage backed securities [Member]
Assets
Available-for-Sale securities		6,212		5,563
Ameriprise Financial [Member] | Recurring basis [Member] | Asset backed securities [Member]
Assets
Available-for-Sale securities		3,088		2,006
Ameriprise Financial [Member] | Recurring basis [Member] | State and municipal obligations [Member]
Assets
Available-for-Sale securities		1,380		1,367
Ameriprise Financial [Member] | Recurring basis [Member] | U.S. government and agencies obligations [Member]
Assets
Available-for-Sale securities		1,680		1,680
Ameriprise Financial [Member] | Recurring basis [Member] | Foreign government bonds and obligations [Member]
Assets
Available-for-Sale securities		267		271
Ameriprise Financial [Member] | Recurring basis [Member] | Other investments [Member]
Assets
Available-for-Sale securities		52		26
Ameriprise Financial [Member] | Recurring basis [Member] | Level 1 [Member]
Assets
Cash equivalents		3,171		267
Available-for-Sale securities		1,680		1,680
Equity securities				1
Trading and other securities at fair value		10		12
Investments segregated for regulatory purposes				14
Other assets		442		163
Total assets at fair value		5,303		2,137
Liabilities
Other liabilities		172		43
Total liabilities at fair value		172		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] | Equity derivative contracts [Member]
Assets
Other assets		442		162
Liabilities
Other liabilities		168		36
Ameriprise Financial [Member] | Recurring basis [Member] | Level 1 [Member] | Foreign exchange derivative contracts [Member]
Assets
Other assets				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		1,680		1,680
Ameriprise Financial [Member] | Recurring basis [Member] | Level 2 [Member]
Assets
Cash equivalents		3,115		2,924
Available-for-Sale securities		33,457		30,663
Trading and other securities at fair value		25		26
Other assets		5,046		4,198
Total assets at fair value		41,643		37,811
Liabilities
Policyholder account balances, future policy benefits and claims		3		3
Customer deposits		8		14
Other liabilities		3,786		3,492
Total liabilities at fair value		3,797		3,509
Ameriprise Financial [Member] | Recurring basis [Member] | Level 2 [Member] | Other liabilities [Member]
Liabilities
Other liabilities		7		4
Ameriprise Financial [Member] | Recurring basis [Member] | Level 2 [Member] | Fixed deferred 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] | Interest rate derivative contracts [Member]
Assets
Other assets		2,015		1,455
Liabilities
Other liabilities		934		418
Ameriprise Financial [Member] | Recurring basis [Member] | Level 2 [Member] | Equity derivative contracts [Member]
Assets
Other assets		2,990		2,722
Liabilities
Other liabilities		2,840		3,062
Ameriprise Financial [Member] | Recurring basis [Member] | Level 2 [Member] | Credit derivative contracts [Member]
Assets
Other assets		5		4
Ameriprise Financial [Member] | Recurring basis [Member] | Level 2 [Member] | Foreign exchange derivative contracts [Member]
Assets
Other assets		36		17
Liabilities
Other liabilities		5		8
Ameriprise Financial [Member] | Recurring basis [Member] | Level 2 [Member] | Corporate debt securities [Member]
Assets
Available-for-Sale securities		12,280		11,437
Ameriprise Financial [Member] | Recurring basis [Member] | Level 2 [Member] | Residential mortgage backed securities [Member]
Assets
Available-for-Sale securities		10,208		10,012
Ameriprise Financial [Member] | Recurring basis [Member] | Level 2 [Member] | Commercial mortgage backed securities [Member]
Assets
Available-for-Sale securities		6,212		5,563
Ameriprise Financial [Member] | Recurring basis [Member] | Level 2 [Member] | Asset backed securities [Member]
Assets
Available-for-Sale securities		3,058		1,987
Ameriprise Financial [Member] | Recurring basis [Member] | Level 2 [Member] | State and municipal obligations [Member]
Assets
Available-for-Sale securities		1,380		1,367
Ameriprise Financial [Member] | Recurring basis [Member] | Level 2 [Member] | Foreign government bonds and obligations [Member]
Assets
Available-for-Sale securities		267		271
Ameriprise Financial [Member] | Recurring basis [Member] | Level 2 [Member] | Other investments [Member]
Assets
Available-for-Sale securities		52		26
Ameriprise Financial [Member] | Recurring basis [Member] | Level 3 [Member]
Assets
Available-for-Sale securities		822		786
Total assets at fair value		822		786
Liabilities
Policyholder account balances, future policy benefits and claims		3,922		1,687
Other liabilities		40		44
Total liabilities at fair value		3,962		1,731
Ameriprise Financial [Member] | Recurring basis [Member] | Level 3 [Member] | Other liabilities [Member]
Liabilities
Other liabilities		40		44
Ameriprise Financial [Member] | Recurring basis [Member] | Level 3 [Member] | Fixed deferred indexed annuity embedded derivatives [Member]
Liabilities
Policyholder account balances, future policy benefits and claims		44		43
Ameriprise Financial [Member] | Recurring basis [Member] | Level 3 [Member] | IUL embedded derivatives [Member]
Liabilities
Policyholder account balances, future policy benefits and claims		926		881
Ameriprise Financial [Member] | Recurring basis [Member] | Level 3 [Member] | GMWB and GMAB embedded derivatives [Member]
Liabilities
Policyholder account balances, future policy benefits and claims		2,943		763
Ameriprise Financial [Member] | Recurring basis [Member] | Level 3 [Member] | Structured annuity embedded derivatives [Member]
Liabilities
Policyholder account balances, future policy benefits and claims		9
Ameriprise Financial [Member] | Recurring basis [Member] | Level 3 [Member] | Corporate debt securities [Member]
Assets
Available-for-Sale securities		742		750
Ameriprise Financial [Member] | Recurring basis [Member] | Level 3 [Member] | Residential mortgage backed securities [Member]
Assets
Available-for-Sale securities		50		17
Ameriprise Financial [Member] | Recurring basis [Member] | Level 3 [Member] | Asset backed securities [Member]
Assets
Available-for-Sale securities		$ 30		$ 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, 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 $4.3 billion and $2.3 billion as of September 30, 2020 and December 31, 2019, respectively. See Note 13 for additional information related to master netting arrangements and cash collateral. See Note 5 for information about derivatives held by consolidated VIEs.

[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 $(1.0) billion cumulative increase (decrease) to the embedded derivatives as of September 30, 2020.

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

[7] The fair value of the GMWB and GMAB embedded derivatives included $3.0 billion of individual contracts in a liability position and $36 million of individual contracts in an asset position as of September 30, 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 as of December 31, 2019.