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Debt (Pledged Assets Related to Secured Borrowings and Repurchase Agreement) (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Pledged Assets related to secured borrowings [Line Items] |  |
Pledged financial instruments, investment securities | $ 72 | $ 2,698
Pledged assets, mortgage assets held-for-investment and lending receivables | 17,256 | 17,135
Pledged assets, restricted as collateral | 40,590 | 46,204
Secured Debt | 19,146 | 25,773
Short-term borrowings | 3,689 | 5,531
Secured debt |  |
Pledged Assets related to secured borrowings [Line Items] |  |
Short-term borrowings | 1,179 | 2,950
Consumer portfolio segment | Automotive loan |  |
Pledged Assets related to secured borrowings [Line Items] |  |
Pledged assets, finance receivables | 12,341 | 13,481
Commercial portfolio segment | Automotive loan |  |
Pledged Assets related to secured borrowings [Line Items] |  |
Pledged assets, finance receivables | 10,921 | 12,890
Ally Bank |  |
Pledged Assets related to secured borrowings [Line Items] |  |
Pledged financial instruments, investment securities | 72 | 2,698
Pledged assets, mortgage assets held-for-investment and lending receivables | 17,256 | 17,135
Pledged assets, restricted as collateral | 39,739 | 44,257
Secured Debt | 18,410 | 24,069
Ally Bank | Pledged assets for Federal Home Loan Bank |  |
Pledged Assets related to secured borrowings [Line Items] |  |
Pledged assets, restricted as collateral | 22,100 | 24,800
Ally Bank | Pledged assets for Federal Reserve Bank |  |
Pledged Assets related to secured borrowings [Line Items] |  |
Pledged assets, restricted as collateral | 2,400 | 2,400
Ally Bank | Consumer portfolio segment | Automotive loan |  |
Pledged Assets related to secured borrowings [Line Items] |  |
Pledged assets, finance receivables | 11,490 | 11,534
Ally Bank | Commercial portfolio segment | Automotive loan |  |
Pledged Assets related to secured borrowings [Line Items] |  |
Pledged assets, finance receivables | $ 10,921 | $ 12,890

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- Definition The carrying amount, as of the date of the latest financial statement presented, of finance receivables which are owned but transferred to serve as collateral for the payment of the related debt obligation, primarily a secured borrowing or repurchase agreement, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
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- Definition The carrying amount, as of the date of the latest financial statement presented, of all assets that are pledged as collateral for the payment of the related debt obligation primarily arising from secured borrowings, repurchase agreements or other current or potential obligations, where the secured party does not have the right by contract or custom to sell or re-pledge the collateral and therefore are not reclassified and separately reported in the statement of financial position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
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- Definition The fair value, as of the date of each statement of financial position presented, of mortgage-related securities, classified as available for sale or held for investment, which are owned but transferred to serve as collateral for the payment of the related debt obligation, primarily a secured borrowing or repurchase agreement, and that are reclassified and separately reported in the statement of financial position because the transferee has the right by contract or custom to sell or re-pledge them. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728 + Details
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- Definition Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower. + 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(a)(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 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(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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