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Debt (Narrative - Trust Preferred Securities) (Details) - USD ($) $ / shares in Units, $ in Billions | Jun. 30, 2020 | Dec. 31, 2019
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Narrative - Trust Preferred Securities [Line Items] |  |
Trust preferred securities | $ 2.6 | $ 2.6
Preferred stock, liquidation amount per share | $ 25 |
Distribution payable in addition to annual rate equal to three-month London interbank offer rate, percentage | 5.785% |
Period of consecutive quarters for which Ally has right to defer interest payments, maximum | 20 |
Redemption price, percentage of principal debt, plus accrued and unpaid interest | 100.00% |
Variable Income Interest Rate [Member] |  |
Narrative - Trust Preferred Securities [Line Items] |  |
Trust preferred securities | $ 2.6 | $ 2.6
Trust Preferred Securities Subject to Mandatory Redemption |  |
Narrative - Trust Preferred Securities [Line Items] |  |
Series 2 TRUPS included in Tier 1 capital | $ 2.5 |

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- Definition Ally has the right to defer payments of interest for a period not exceeding consecutive quarters of + References No definition available. + Details
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- Definition Distributions will be payable at an annual rate equal to three-month London interbank offer rate plus: + References No definition available. + Details
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- Definition [Line Items] for Narrative - Trust Preferred Securities [Table] + References No definition available. + Details
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- Definition Percent of principal debt, plus accrued and unpaid interest is the redemption price if Ally redeems the Series 2 TRUPS at anytime on or before February 15, 2040. + References No definition available. + Details
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- Definition The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21484-112644 + Details
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