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Capital - Preferred Stock and Treasury Stock (Details) - USD ($) $ / shares in Units, $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Mar. 17, 2017 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Oct. 23, 2018
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |
Issuance and exercise of FDIC Equity appreciation instrument (in shares) |  | 39,032,006 | 214,990,316 |  |
Preferred stock, par value (in usd per share) |  | $ 0.01 | $ 0.01 |  |
Stock repurchased authorized amount |  |  |  |  | $ 300
Treasury stock, acquired, shares (in shares) |  | 30,000,000 | 871,710,000,000 |  |
Treasury stock, shares average price (in dollars per share) |  | $ 9.61 |  |  |
Treasury stock, acquired, cost |  | $ 286 | $ 8 |  |
Treasury stock repurchased |  | $ 0 | $ 7 | $ 0 |
Fixed-to-Floating Rate Series A Noncumulative Perpetual Preferred Stock |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |
Issuance and exercise of FDIC Equity appreciation instrument (in shares) | 20,600,000 |  |  |  |
Preferred stock, par value (in usd per share) | $ 0.01 |  |  |  |
Preferred stock, liquidation preference per share (in dollars per share) | 1.00 |  |  |  |
Stock issued during period, per depository share (in dollars per share) | $ 25 |  |  |  |
Dividend rate percentage | 637.50% |  |  |  |
Preferred stock, dividend rate, basis spread on variable rate | 3.821% |  |  |  |

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