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Equity - Preferred Stock Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 31, 2021 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | May 25, 2023 | May 03, 2023 | May 04, 2022 | Aug. 04, 2021 | Jun. 15, 2021
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Issued |  | 25,572,200 | 25,572,200 |  |  |  |  |  |
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |  |  |  |  |
Preferred stock, shares outstanding |  | 25,572,200 | 25,572,200 |  |  |  |  |  |
Preferred stock, par value |  | $ 0.01 | $ 0.01 |  |  |  |  |  |
Preferred Stock, Shares Authorized |  | 200,000,000 | 200,000,000 |  |  |  |  |  |
Preferred stock redemption premium |  | $ 0 | $ 0 | $ 6 |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  | $ 1,000 | $ 3,000 | $ 3,000 | $ 3,000 |
August2021Authorization |  |  |  |  |  |  |  |  |
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  | 0 |  |  |  |  |  |  |
May2022Authorization |  |  |  |  |  |  |  |  |
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  | 0 |  |  |  |  |  |  |
May252023Authorization |  |  |  |  |  |  |  |  |
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  | 1,000 |  |  |  |  |  |  |
May32023Authorization |  |  |  |  |  |  |  |  |
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  | $ 1,102 |  |  |  |  |  |  |
Series E Preferred Stock [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  | 5.625% |  |  |  |  |  |  |
Preferred Stock, Shares Issued |  | 32,200 | 32,200 |  |  |  |  |  |
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |  |  |  |  |
Preferred stock, shares outstanding |  | 32,200 | 32,200 |  |  |  |  |  |
Preferred stock, aggregate liquidation preference |  | $ 25,000 |  |  |  |  |  |  |
Preferred Stock, Shares Authorized |  | 32,200 | 32,200 |  |  |  |  |  |
Series E Preferred Stock [Member] | Depositary Share [Member] |  |  |  |  |  |  |  |  |
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |  |  |  |  |
Preferred stock, aggregate liquidation preference |  | $ 25 |  |  |  |  |  |  |
5.875% Fixed-to-Floating Rate Non-Cumulative Preferred Stock, Series D, par value $0.01 |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Issued |  | 500,000 | 500,000 |  |  |  |  |  |
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |  |  |  |  |
Preferred stock, shares outstanding |  | 500,000 | 500,000 |  |  |  |  |  |
Preferred Stock, Dividend Payment Rate, Variable |  | 5.875% Fixed-to-Floating Rate |  |  |  |  |  |  |
Preferred stock, aggregate liquidation preference |  | $ 1,000 |  |  |  |  |  |  |
Preferred Stock, Shares Authorized |  | 500,000 | 500,000 |  |  |  |  |  |
Series C Preferred Stock [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Preferred stock redemption price per share | $ 1,000 |  |  |  |  |  |  |  |
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |  |  |  |  |
Preferred stock, par value |  |  | $ 0.01 |  |  |  |  |  |
Redeem and Canceled Preferred Stock [Line Items] | 500,000 |  |  |  |  |  |  |  |
Preferred stock redemption premium | $ 6 |  |  |  |  |  |  |  |
Preferred Stock, Redemption Amount |  |  |  |  |  |  |  |  | $ 500
Series A Preferred Stock [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Issued |  | 24,000,000 | 24,000,000 |  |  |  |  |  |
Preferred stock redemption price per share |  | $ 25 |  |  |  |  |  |  |
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |  |  |  |  |
Preferred stock, shares outstanding |  | 24,000,000 | 24,000,000 |  |  |  |  |  |
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 |  |  |  |  |  |
Depositary Shares, each representing a 1/1,000th interest in a share of 4.75% Non-Cumulative Preferred Stock, Series F |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  | 4.75% |  |  |  |  |  |  |
Preferred Stock, Shares Issued |  | 40,000 | 40,000 |  |  |  |  |  |
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |  |  |  |  |
Preferred stock, shares outstanding |  | 40,000 | 40,000 |  |  |  |  |  |
Preferred stock, aggregate liquidation preference |  | $ 25,000 |  |  |  |  |  |  |
Preferred Stock, Shares Authorized |  | 40,000 | 40,000 |  |  |  |  |  |
Depositary Shares, each representing a 1/1,000th interest in a share of 4.75% Non-Cumulative Preferred Stock, Series F | Depositary Share [Member] |  |  |  |  |  |  |  |  |
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |  |  |  |  |
Preferred stock, aggregate liquidation preference |  | $ 25 |  |  |  |  |  |  |
3.850% Fixed Rate Reset Non-Cumulative Preferred Stock, Series G, par value $0.01 |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  | 3.85% |  |  |  |  |  |  |
Preferred Stock, Shares Issued |  | 1,000,000 | 1,000,000 |  |  |  |  |  |
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |  |  |  |  |
Preferred stock, shares outstanding |  | 1,000,000 | 1,000,000 |  |  |  |  |  |
Preferred stock, aggregate liquidation preference |  | $ 1,000 |  |  |  |  |  |  |
Preferred Stock, Shares Authorized |  | 1,000,000 | 1,000,000 |  |  |  |  |  |
Fixed Rate1 [Member] | 5.875% Fixed-to-Floating Rate Non-Cumulative Preferred Stock, Series D, par value $0.01 |  |  |  |  |  |  |  |  |
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Payment Rate, Variable |  | 5.875 |  |  |  |  |  |  |
Variable Rate1 [Member] | 5.875% Fixed-to-Floating Rate Non-Cumulative Preferred Stock, Series D, par value $0.01 |  |  |  |  |  |  |  |  |
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Payment Rate, Variable |  | three-month CME Term SOFR plus a spread adjustment of 0.26161% + 2.959% |  |  |  |  |  |  |
Variable Rate1 [Member] | 3.850% Fixed Rate Reset Non-Cumulative Preferred Stock, Series G, par value $0.01 |  |  |  |  |  |  |  |  |
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Payment Rate, Variable |  | five year treasury rate, reset every five years, + 3.576% |  |  |  |  |  |  |
RatingAgency [Member] | 5.875% Fixed-to-Floating Rate Non-Cumulative Preferred Stock, Series D, par value $0.01 |  |  |  |  |  |  |  |  |
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |  |  |  |  |
Preferred stock, aggregate liquidation preference |  | $ 1,020 |  |  |  |  |  |  |
RatingAgency [Member] | Depositary Shares, each representing a 1/1,000th interest in a share of 4.75% Non-Cumulative Preferred Stock, Series F |  |  |  |  |  |  |  |  |
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |  |  |  |  |
Preferred stock, aggregate liquidation preference |  | 25,500 |  |  |  |  |  |  |
RatingAgency [Member] | Depositary Shares, each representing a 1/1,000th interest in a share of 4.75% Non-Cumulative Preferred Stock, Series F | Depositary Share [Member] |  |  |  |  |  |  |  |  |
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |  |  |  |  |
Preferred stock, aggregate liquidation preference |  | 25.50 |  |  |  |  |  |  |
RatingAgency [Member] | 3.850% Fixed Rate Reset Non-Cumulative Preferred Stock, Series G, par value $0.01 |  |  |  |  |  |  |  |  |
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |  |  |  |  |
Preferred stock, aggregate liquidation preference |  | $ 1,020 |  |  |  |  |  |  |

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