Equity - Preferred Stock Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2024	May 01, 2024	Dec. 31, 2023	May 25, 2023	May 03, 2023	May 04, 2022
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
Stock Repurchase Program, Authorized Amount		$ 3,000		$ 1,000	$ 3,000	$ 3,000
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	0
May32023Authorization
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Stock Repurchase Program, Remaining Authorized Repurchase Amount	0
May012024Authorization
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 1,925
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 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