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Regulatory Capital and Other Regulatory Matters (Schedule of Regulatory Capital Amount and Ratios) (Details) - USD ($) $ in Millions | Oct. 01, 2020 | Jun. 30, 2020 | Dec. 31, 2019
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Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
BHC Enhanced Prudential Standards, Minimum |  | $ 100,000 |
Minimum capital conservation buffer | 3.50% | 2.50% | 2.50%
BHC stress capital buffer threshold |  | $ 100,000 |
BHC capital requirement, dividend payout ratio |  | 30.00% |
Capital conservation buffer |  | 5.59% | 4.76%
Phase-in of capital impact of Accounting Standards Update 2016-13 |  | 25.00% |
CECL scaling factor |  | 25.00% |
Common Equity Tier One Capital – threshold for deduction of certain items, individually |  | 10.00% |
Common Equity Tier One Capital - threshold for deduction of certain items, collectively |  | 15.00% |
Risk weighting for certain items not deducted |  | 100.00% |
Common Equity Tier One Capital - threshold for deduction of certain items, transitional |  | 25.00% |
Risk weighting for certain items not deducted, transitional |  | 250.00% |
Accounting Standards Update 2016-13 |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Phase-in of capital impact of Accounting Standards Update 2016-13 |  | 25.00% |
CECL scaling factor |  | 25.00% |
Reduction to Common Equity Tier 1 Capital from CECL |  | $ 1,200 |
Ally Financial Inc |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Common equity tier one capital ratio |  | 10.09% | 9.54%
Common equity tier one capital |  | $ 13,826 | $ 13,837
Tier one capital to risk-weighted assets, amount |  | $ 16,235 | $ 16,271
Tier one capital to risk-weighted assets, ratio |  | 11.85% | 11.22%
Capital to risk-weighted assets, amount |  | $ 18,895 | $ 18,506
Capital to risk-weighted assets, ratio |  | 13.79% | 12.76%
Tier one leverage to adjusted quarterly average assets, amount |  | $ 16,235 | $ 16,271
Tier one leverage to adjusted quarterly average assets, ratio |  | 8.93% | 9.08%
Ally Bank |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Common equity tier one capital ratio |  | 13.21% | 12.30%
Minimum capital conservation buffer |  | 2.50% |
Common equity tier one capital |  | $ 16,918 | $ 16,627
Tier one capital to risk-weighted assets, amount |  | $ 16,918 | $ 16,627
Tier one capital to risk-weighted assets, ratio |  | 13.21% | 12.30%
Capital to risk-weighted assets, amount |  | $ 18,522 | $ 17,854
Capital to risk-weighted assets, ratio |  | 14.46% | 13.21%
Tier one leverage to adjusted quarterly average assets, amount |  | $ 16,918 | $ 16,627
Tier one leverage to adjusted quarterly average assets, ratio |  | 9.94% | 10.01%
Minimum |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Common equity tier one capital ratio |  | 4.50% |
Tier one capital to risk-weighted assets, required minimum |  | 6.00% |
Capital to risk-weighted assets, required minimum |  | 8.00% |
Tier one leverage ratio, minimum |  | 4.00% |
Minimum | Ally Financial Inc |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Common equity tier one capital ratio |  | 4.50% |
Tier one capital to risk-weighted assets, required minimum |  | 6.00% |
Capital to risk-weighted assets, required minimum |  | 8.00% |
Tier one leverage ratio, minimum |  | 4.00% |
Tier one capital to risk-weighted assets, well-capitalized minimum |  | 6.00% |
Capital to risk weighted assets, well-capitalzed minimum |  | 10.00% |
Minimum | Ally Bank |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Common equity tier one capital ratio |  | 4.50% |
Tier one capital to risk-weighted assets, required minimum |  | 6.00% |
Capital to risk-weighted assets, required minimum |  | 8.00% |
Tier one leverage ratio, minimum |  | 4.00% |
Common Equity Tier One Capital Ratio Required To Be Well Capitalized |  | 6.50% |
Tier one capital to risk-weighted assets, well-capitalized minimum |  | 8.00% |
Capital to risk weighted assets, well-capitalzed minimum |  | 10.00% |
Tier one leverage to adjusted quarterly average assets, well-capitalized minimum |  | 5.00% |

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- Definition Bank holding companies with total consolidated assets equal to or greater than $100 billion and less than $250 billion may be subject to enhanced prudential standards as part of the amendments to the Dodd-Frank Wall Street Reform and Consumer Protection Act. + References No definition available. + Details
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