v3.26.1
Preferred Stock and Common Stock, Preferred Stock (Details)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
USD ($)
shares
Mar. 31, 2026
USD ($)
Jun. 30, 2025
USD ($)
Mar. 31, 2025
USD ($)
Jun. 30, 2026
USD ($)
vote
shares
Dec. 31, 2025
USD ($)
shares
Preferred Stock, Number of Shares, Par Value and Other Disclosure [Abstract]            
Preferred stock, shares authorized and designated 4,611,900       4,611,900 4,662,300
Preferred stock, shares issued and outstanding 4,550,346       4,550,346 4,600,746
Preferred stock, liquidation preference, value | $ $ 16,116       $ 16,116 $ 17,376
Preferred stock, carrying value | $ $ 15,348       $ 15,348 $ 16,608
Detail of Preferred Stock [Abstract]            
Voting rights         If issued, preference shares would be limited to one vote per share  
Number of additional common stock shares per preferred share 16.5916       16.5916 16.5916
Preferred stock, convertible, settlement method [Extensible Enumeration] Net Combination Settlement [Member]       Net Combination Settlement [Member] Net Combination Settlement [Member]
Preferred stock, convertible, control of rights [Fixed List] Holder       Holder Holder
Preferred stock, no voting rights [Member]            
Detail of Preferred Stock [Abstract]            
Preferred shares authorized 20,000,000       20,000,000  
Preferred stock, par or stated value | $ $ 0       $ 0  
Preferred stock, voting rights [Member]            
Preferred Stock, Number of Shares, Par Value and Other Disclosure [Abstract]            
Preferred stock, shares issued and outstanding 0       0  
Detail of Preferred Stock [Abstract]            
Preferred shares authorized 4,000,000       4,000,000  
Preferred stock, par or stated value | $ $ 0       $ 0  
Number of votes per share | vote         1  
Dividend Equalization Preferred Shares (DEP) [Member]            
Preferred Stock, Number of Shares, Par Value and Other Disclosure [Abstract]            
Preferred stock, shares authorized and designated 97,000       97,000 97,000
Preferred stock, shares issued and outstanding 96,546       96,546 96,546
Preferred stock, liquidation preference, value | $ $ 0       $ 0 $ 0
Preferred stock, carrying value | $ $ 0       $ 0 $ 0
Series L - 7.50% Non-Cumulative Perpetual Convertible Class A Preferred Stock [Member]            
Preferred Stock, Number of Shares, Par Value and Other Disclosure [Abstract]            
Preferred stock, shares authorized and designated 4,025,000       4,025,000 4,025,000
Preferred stock, shares issued and outstanding 3,967,900       3,967,900 3,967,900
Preferred stock, liquidation preference, value | $ $ 3,968       $ 3,968 $ 3,968
Preferred stock, carrying value | $ $ 3,200       $ 3,200 $ 3,200
Preferred stock, dividend rate (percent)         7.50% 7.50%
Detail of Preferred Stock [Abstract]            
Number of common stock shares per preferred share 6.3814       6.3814 6.3814
Dividends, preferred stock | $ $ 74 $ 74 $ 74 $ 74    
Series Y - 5.625% Non-Cumulative Perpetual Class A Preferred Stock [Member]            
Preferred Stock, Number of Shares, Par Value and Other Disclosure [Abstract]            
Preferred stock, shares authorized and designated 27,600       27,600 27,600
Preferred stock, shares issued and outstanding 27,600       27,600 27,600
Preferred stock, liquidation preference, value | $ $ 690       $ 690 $ 690
Preferred stock, carrying value | $ $ 690       $ 690 $ 690
Preferred stock, dividend rate (percent)         5.625% 5.625%
Series Z - 4.75% Non-Cumulative Perpetual Class A Preferred Stock [Member]            
Preferred Stock, Number of Shares, Par Value and Other Disclosure [Abstract]            
Preferred stock, shares authorized and designated 80,500       80,500 80,500
Preferred stock, shares issued and outstanding 80,500       80,500 80,500
Preferred stock, liquidation preference, value | $ $ 2,013       $ 2,013 $ 2,013
Preferred stock, carrying value | $ $ 2,013       $ 2,013 $ 2,013
Preferred stock, dividend rate (percent)         4.75% 4.75%
Series AA - 4.70% Non-Cumulative Perpetual Class A Preferred Stock [Member]            
Preferred Stock, Number of Shares, Par Value and Other Disclosure [Abstract]            
Preferred stock, shares authorized and designated 46,800       46,800 46,800
Preferred stock, shares issued and outstanding 46,800       46,800 46,800
Preferred stock, liquidation preference, value | $ $ 1,170       $ 1,170 $ 1,170
Preferred stock, carrying value | $ $ 1,170       $ 1,170 $ 1,170
Preferred stock, dividend rate (percent)         4.70% 4.70%
Series BB - 3.90% Fixed-Reset Non-Cumulative Perpetual Class A Preferred Stock [Member]            
Preferred Stock, Number of Shares, Par Value and Other Disclosure [Abstract]            
Preferred stock, shares authorized and designated 0       0 140,400
Preferred stock, shares issued and outstanding 0       0 140,400
Preferred stock, liquidation preference, value | $ $ 0       $ 0 $ 3,510
Preferred stock, carrying value | $ $ 0       $ 0 $ 3,510
Preferred stock, dividend rate (percent)         3.90% 3.90%
Series CC - 4.375% Non-Cumulative Perpetual Class A Preferred Stock [Member]            
Preferred Stock, Number of Shares, Par Value and Other Disclosure [Abstract]            
Preferred stock, shares authorized and designated 46,000       46,000 46,000
Preferred stock, shares issued and outstanding 42,000       42,000 42,000
Preferred stock, liquidation preference, value | $ $ 1,050       $ 1,050 $ 1,050
Preferred stock, carrying value | $ $ 1,050       $ 1,050 $ 1,050
Preferred stock, dividend rate (percent)         4.375% 4.375%
Series DD - 4.25% Non-Cumulative Perpetual Class A Preferred Stock [Member]            
Preferred Stock, Number of Shares, Par Value and Other Disclosure [Abstract]            
Preferred stock, shares authorized and designated 50,000       50,000 50,000
Preferred stock, shares issued and outstanding 50,000       50,000 50,000
Preferred stock, liquidation preference, value | $ $ 1,250       $ 1,250 $ 1,250
Preferred stock, carrying value | $ $ 1,250       $ 1,250 $ 1,250
Preferred stock, dividend rate (percent)         4.25% 4.25%
Series EE - 7.625% Fixed-Reset-Non-Cumulative Perpetual Class A Preferred Stock [Member]            
Preferred Stock, Number of Shares, Par Value and Other Disclosure [Abstract]            
Preferred stock, shares authorized and designated 69,000       69,000 69,000
Preferred stock, shares issued and outstanding 69,000       69,000 69,000
Preferred stock, liquidation preference, value | $ $ 1,725       $ 1,725 $ 1,725
Preferred stock, carrying value | $ $ 1,725       $ 1,725 $ 1,725
Preferred stock, dividend rate (percent)         7.625% 7.625%
Series FF - 6.85% Fixed-Reset-Non-Cumulative Perpetual Class A Preferred Stock [Member]            
Preferred Stock, Number of Shares, Par Value and Other Disclosure [Abstract]            
Preferred stock, shares authorized and designated 80,000       80,000 80,000
Preferred stock, shares issued and outstanding 80,000       80,000 80,000
Preferred stock, liquidation preference, value | $ $ 2,000       $ 2,000 $ 2,000
Preferred stock, carrying value | $ $ 2,000       $ 2,000 $ 2,000
Preferred stock, dividend rate (percent)         6.85% 6.85%
Series GG - 6.125% Fixed-Reset-Non-Cumulative Perpetual Class A Preferred Stock [Member]            
Preferred Stock, Number of Shares, Par Value and Other Disclosure [Abstract]            
Preferred stock, shares authorized and designated 90,000       90,000 0
Preferred stock, shares issued and outstanding 90,000       90,000 0
Preferred stock, liquidation preference, value | $ $ 2,250       $ 2,250 $ 0
Preferred stock, carrying value | $ $ 2,250       $ 2,250 $ 0
Preferred stock, dividend rate (percent)         6.125%