Financing Receivables (Allowance for Loan Losses) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Rollforward of the allowance for loan losses
Beginning balance			$ 24	$ 26
Charge-offs			(1)	(2)
Ending balance	$ 23	$ 24	23	24
Individually evaluated for impairment	0	0	0	0
Collectively evaluated for impairment	23	24	23	24
Credit quality information [Line Items]
Individually evaluated for impairment	14		14		$ 24
Collectively evaluated for impairment	3,252		3,252		3,239
Total	3,266		3,266		3,263
Recorded investment in financing receivables individually evaluated for impairment with no related allowance for loan losses	14		14		24
Credit Card Receivables	92		92
Syndicated loans [Member]
Credit quality information [Line Items]
Total	543		543		548
Loans purchased	52	36	126	181
Loans sold	13	$ 13	40	$ 49
Loans to financial advisors [Member]
Credit quality information [Line Items]
Principal amounts outstanding for advisor loans	629		629		558
Allowance for loan losses related to loans to financial advisors	30		30		25
Principal amounts outstanding for advisor loans no longer affiliated with the Ameriprise Financial	17		17		18
Allowance for loan losses related to loans to financial advisors no longer affiliated with Ameriprise Financial	$ 13		$ 13		$ 13

Allowance for loan losses related to loans to financial advisors

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Allowance for loan losses related to loans to financial advisors no longer affiliated with Ameriprise Financial

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Principal amounts outstanding for advisor loans

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Principal amounts outstanding for advisor loans no longer affiliated with Ameriprise Financial

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Amounts receivable from issuing a card to individuals or businesses that allows someone to make a purchase on borrowed money.

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of writeoff of financing receivable, charged against allowance for credit loss.

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The balance of financing receivables that were collectively evaluated for impairment.

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The balance of financing receivables that were individually evaluated for impairment.

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Amount of increase from purchase of financing receivable.

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Amount of decrease from sale and reclassification to held-for-sale of financing receivable.

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Amount of investment in impaired financing receivables for which there is no related allowance for credit losses.

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Amount, before allowance for credit loss, of financing receivable.

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