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Equity - Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Dividends Payable [Line Items] |  |  |
Preferred Stock, Shares Authorized | 200,000,000 | 200,000,000 |
Preferred Stock, Shares Issued | 25,572,200 | 25,572,200 |
Preferred Stock, Shares Outstanding | 25,572,200 | 25,572,200 |
Preferred Stock |  |  |
Preferred stock, dividends | $ 200 | $ 198 | $ 185
Series A Preferred Stock [Member] |  |  |
Dividends Payable [Line Items] |  |  |
Preferred Stock, Dividend Payment Rate, Variable | Three-month CME Term SOFR plus a spread adjustment of 0.26161% + 1.000%, with floor of 4.000% |  |
Preferred Stock, Shares Authorized | 27,600,000 | 27,600,000 |
Preferred Stock, Shares Issued | 24,000,000 | 24,000,000 |
Preferred Stock, Shares Outstanding | 24,000,000 | 24,000,000 |
Preferred Stock |  |  |
Preferred Stock, Dividends Per Share, Declared | $ 1.659 | $ 1.577 | $ 1.033
Preferred stock, dividends | $ 39 | $ 37 | $ 24
5.875% Fixed-to-Floating Rate Non-Cumulative Preferred Stock, Series D, par value $0.01 |  |  |
Dividends Payable [Line Items] |  |  |
Preferred Stock, Dividend Payment Rate, Variable | 5.875% Fixed-to-Floating Rate |  |
Preferred Stock, Shares Authorized | 500,000 | 500,000 |
Preferred Stock, Shares Issued | 500,000 | 500,000 |
Preferred Stock, Shares Outstanding | 500,000 | 500,000 |
Preferred Stock |  |  |
Preferred Stock, Dividends Per Share, Declared | $ 58.750 | $ 58.750 | $ 58.750
Preferred stock, dividends | $ 29 | $ 29 | $ 29
Series E Preferred Stock [Member] |  |  |
Dividends Payable [Line Items] |  |  |
Preferred Stock, Shares Authorized | 32,200 | 32,200 |
Preferred Stock, Shares Issued | 32,200 | 32,200 |
Preferred Stock, Shares Outstanding | 32,200 | 32,200 |
Preferred Stock |  |  |
Preferred Stock, Dividends Per Share, Declared | $ 1,406.252 | $ 1,406.252 | $ 1,406.252
Preferred stock, dividends | $ 45 | $ 45 | $ 45
Series A Junior Preferred Stock [Member] |  |  |
Dividends Payable [Line Items] |  |  |
Preferred Stock, Shares Authorized | 10,000,000 | 10,000,000 |
Preferred Stock, Shares Issued | 0 | 0 |
Preferred Stock, Shares Outstanding | 0 | 0 |
Not Designated Preferred Stock [Member] |  |  |
Dividends Payable [Line Items] |  |  |
Preferred Stock, Shares Authorized | 160,827,800 | 160,827,800 |
Preferred Stock, Shares Issued | 0 | 0 |
Preferred Stock, Shares Outstanding | 0 | 0 |
Depositary Shares, each representing a 1/1,000th interest in a share of 4.75% Non-Cumulative Preferred Stock, Series F |  |  |
Dividends Payable [Line Items] |  |  |
Preferred Stock, Shares Authorized | 40,000 | 40,000 |
Preferred Stock, Shares Issued | 40,000 | 40,000 |
Preferred Stock, Shares Outstanding | 40,000 | 40,000 |
Preferred Stock |  |  |
Preferred Stock, Dividends Per Share, Declared | $ 1,187.5 | $ 1,187.5 | $ 1,187.5
Preferred stock, dividends | $ 48 | $ 48 | $ 48
3.850% Fixed Rate Reset Non-Cumulative Preferred Stock, Series G, par value $0.01 |  |  |
Dividends Payable [Line Items] |  |  |
Preferred Stock, Shares Authorized | 1,000,000 | 1,000,000 |
Preferred Stock, Shares Issued | 1,000,000 | 1,000,000 |
Preferred Stock, Shares Outstanding | 1,000,000 | 1,000,000 |
Preferred Stock |  |  |
Preferred Stock, Dividends Per Share, Declared | $ 38.500 | $ 38.500 | $ 38.500
Preferred stock, dividends | $ 39 | $ 39 | $ 39

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