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Equity (Preferred Stock - Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Sep. 10, 2020 | Jan. 15, 2020 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Class of Stock [Line Items] |  |  |  |  |
Preferred Stock, Shares Issued |  |  | 25,572,200 | 25,572,200 |
Preferred stock issued, net of issuance costs |  |  | $ 0 | $ 0 | $ 1,961
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 | $ 6 | $ 14
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  | 1,200 |  |
December2020Authorization |  |  |  |  |
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  | 0 |  |
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 |  |  | $ 1,205 |  |
Series E Preferred Stock [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  | 562.50% |  |
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, Dividend Payment Rate, Variable |  |  | 5.625 |  |
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 | $ 1,000
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |
Preferred stock, par value |  |  |  | $ 0.01 |
Preferred Stock, Shares Authorized |  |  |  |  | 1,500,000
Redeem and Canceled Preferred Stock [Line Items] |  |  |  | 500,000 | 1,000,000
Preferred stock redemption premium |  |  |  | $ 6 | $ 14
Preferred Stock, Redemption Amount |  |  |  | $ 500 | $ 1,000
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 LIBOR + 1.00%, with floor of 4.00% |  |
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% | 475.00% |  |
Preferred Stock, Shares Issued |  | 40,000 | 40,000 | 40,000 |
Preferred stock issued, net of issuance costs |  | $ 972 |  |  |
Payments of Stock Issuance Costs |  | $ 28 |  |  |
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |
Preferred stock, shares outstanding |  |  | 40,000 | 40,000 |
Preferred stock, par value |  | $ 0.01 |  |  |
Preferred stock, aggregate liquidation preference |  | $ 25,000 | $ 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% |  | 385.00% |  |
Preferred Stock, Shares Issued | 1,000,000 |  | 1,000,000 | 1,000,000 |
Preferred stock issued, net of issuance costs | $ 989 |  |  |  |
Payments of Stock Issuance Costs | $ 11 |  |  |  |
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |
Preferred stock, shares outstanding |  |  | 1,000,000 | 1,000,000 |
Preferred stock, par value | $ 0.01 |  |  |  |
Preferred stock, aggregate liquidation preference | $ 1,000 |  | $ 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 LIBOR + 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] | Series E Preferred Stock [Member] |  |  |  |  |
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |
Preferred stock, aggregate liquidation preference |  |  | $ 25,500 |  |
RatingAgency [Member] | Series E Preferred Stock [Member] | Depositary Share [Member] |  |  |  |  |
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |
Preferred stock, aggregate liquidation preference |  |  | 25.50 |  |
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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