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Equity (Preferred Stock) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Sep. 10, 2020 | Jan. 15, 2020
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 | $ 185 | $ 195 | $ 202 |  |
Series A Preferred Stock [Member] |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |
Preferred Stock, Dividend Payment Rate, Variable | Three-month LIBOR + 1.00%, with floor of 4.00% |  |  |  |
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 | $ 1.033 | $ 1.015 | $ 1.015 |  |
Preferred stock, dividends | $ 24 | $ 24 | $ 24 |  |
Series C Preferred Stock [Member] |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |
Preferred Stock, Shares Authorized |  |  | 1,500,000 |  |
Preferred Stock |  |  |  |  |
Preferred Stock, Dividends Per Share, Declared | $ 0 | $ 19.085 | $ 45.860 |  |
Preferred stock, dividends | $ 0 | $ 10 | $ 59 |  |
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 | $ 30 |  |
Series E Preferred Stock [Member] |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |
Preferred Stock, Dividend Payment Rate, Variable | 5.625 |  |  |  |
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 |  |  | 40,000
Preferred Stock, Shares Outstanding | 40,000 | 40,000 |  |  |
Preferred Stock |  |  |  |  |
Preferred Stock, Dividends Per Share, Declared | $ 1,187.5 | $ 1,187.5 | $ 1,088.542 |  |
Preferred stock, dividends | $ 48 | $ 48 | $ 44 |  |
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 |  | 1,000,000 |
Preferred Stock, Shares Outstanding | 1,000,000 | 1,000,000 |  |  |
Preferred Stock |  |  |  |  |
Preferred Stock, Dividends Per Share, Declared | $ 38.500 | $ 39.035 | $ 0 |  |
Preferred stock, dividends | $ 39 | $ 39 | $ 0 |  |

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