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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