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Financing Receivables Financing Receivables (Reinsurance Deposit Receivable) (Details) - USD ($) $ in Billions | 3 Months Ended |
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Mar. 31, 2019 | Sep. 30, 2019
Receivables [Abstract] |  |
Amount of fixed annuity policies reinsured | $ 1.7 |
Reinsurance deposit receivable |  | $ 1.5

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- Definition Amount of fixed annuity policies reinsured + References No definition available. + Details
Name: | amp_Amountoffixedannuitypoliciesreinsured
Namespace Prefix: | amp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of the reinsurer's funds held on its behalf by the ceding insurer, including funds held in trust, under reinsurance treaties or contracts with the assuming insurer as security for the payment of the obligations thereunder. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.2,10) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
Name: | us-gaap_FundsHeldUnderReinsuranceAgreementsAsset
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_ReceivablesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration