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Shareholders' Equity - Number of Shares Issued and Outstanding and Carrying Amount of Preferred Stock (Detail) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Class of Stock [Line Items]    
Shares Issued and Outstanding 225,510 209,510
Liquidation Preference $ 6,576 $ 6,176
Discount 205 193
Carrying Amount $ 6,371 $ 5,983
Series A [Member]    
Class of Stock [Line Items]    
Shares Issued and Outstanding 12,510 12,510
Liquidation Preference $ 1,251 $ 1,251
Discount 145 145
Carrying Amount $ 1,106 $ 1,106
Series B [Member]    
Class of Stock [Line Items]    
Shares Issued and Outstanding 40,000 40,000
Liquidation Preference $ 1,000 $ 1,000
Carrying Amount $ 1,000 $ 1,000
Series F [Member]    
Class of Stock [Line Items]    
Shares Issued and Outstanding   44,000
Liquidation Preference   $ 1,100
Discount   12
Carrying Amount   $ 1,088
Series I [Member]    
Class of Stock [Line Items]    
Shares Issued and Outstanding   30,000
Liquidation Preference   $ 750
Discount   5
Carrying Amount   $ 745
Series J [Member]    
Class of Stock [Line Items]    
Shares Issued and Outstanding 40,000 40,000
Liquidation Preference $ 1,000 $ 1,000
Discount 7 7
Carrying Amount $ 993 $ 993
Series K [Member]    
Class of Stock [Line Items]    
Shares Issued and Outstanding 23,000 23,000
Liquidation Preference $ 575 $ 575
Discount 10 10
Carrying Amount $ 565 $ 565
Series L [Member]    
Class of Stock [Line Items]    
Shares Issued and Outstanding 20,000 20,000
Liquidation Preference $ 500 $ 500
Discount 14 14
Carrying Amount $ 486 $ 486
Series M [Member]    
Class of Stock [Line Items]    
Shares Issued and Outstanding 30,000  
Liquidation Preference $ 750  
Discount 21  
Carrying Amount $ 729  
Series N [Member]    
Class of Stock [Line Items]    
Shares Issued and Outstanding 60,000  
Liquidation Preference $ 1,500  
Discount 8  
Carrying Amount $ 1,492