COMMITMENTS, CONTINGENCIES AND GUARANTEES, Legal Matters Contingencies (Details)	6 Months Ended
Mar. 31, 2016 USD ($) class_action_lawsuit
Legal matter contingencies [Abstract]
Indemnification asset	$ 36,000,000
Indemnification agreement
Legal matter contingencies [Abstract]
Estimate of range of possible loss, minimum	18,000,000
Estimate of range of possible loss, maximum	69,000,000
Loss contingency accrual	36,000,000
Regulatory matter, total
Legal matter contingencies [Abstract]
Loss contingency accrual	20,000,000
Regulatory matter
Legal matter contingencies [Abstract]
Loss contingency accrual	17,000,000
Pending litigation \| Regions funds, class action
Loss Contingency, Settlement [Abstract]
Litigation settlement amount	62,000,000
Pending litigation \| Regions funds, derivative action
Loss Contingency, Settlement [Abstract]
Litigation settlement amount	$ 6,000,000
Pending litigation \| Open end funds
Loss Contingency, Settlement [Abstract]
Number of pending class action pertaining to open ended funds \| class_action_lawsuit	1
Pending litigation \| Various lawsuits
Legal matter contingencies [Abstract]
Estimate of range of possible loss, minimum	$ 0
Range of loss portion not accrued	$ 4,000,000

The amount of indemnification assets (amounts to be reimbursed if and when certain assumed liabilities are paid) recognized at the acquisition date of a business combination.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472

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- Definition

Amount of judgment or settlement awarded to (against) the entity in respect of litigation.

+ References

No definition available.

+ Details

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- References

No definition available.

+ Details

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- Definition

Amount of loss contingency liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349

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- Definition

Number of pending claims pertaining to a loss contingency.

+ References

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- Definition

The estimated maximum amount of possible loss from the contingency.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 9
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349

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- Definition

The estimated minimum amount of possible loss from the contingency.

+ References

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- Definition

The difference between the maximum amount of estimated loss and the amount recorded as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 05
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6395354&loc=d3e12631-108344

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- References

No definition available.

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