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INVESTMENTS - Debt Securities Held-to-Maturity (Details) - USD ($)
$ in Millions
1 Months Ended
Feb. 28, 2021
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Held-to-maturity debt securities          
Amortized cost, net   $ 242,547 $ 216,963    
Gross unrealized gains   357 1,714    
Gross unrealized losses   12,250 2,639    
Fair value   230,654 216,038    
Allowance for credit losses on HTM debt securities   85 87 $ 78 $ 86
Mortgage-backed securities - U.S. government-sponsored agency guaranteed          
Held-to-maturity debt securities          
Amortized cost, net   68,988 63,885    
Gross unrealized gains   137 1,076    
Gross unrealized losses   4,034 925    
Fair value   65,091 64,036    
Mortgage-backed securities - Non-U.S. residential          
Held-to-maturity debt securities          
Amortized cost, net   714 736    
Gross unrealized gains   0 3    
Gross unrealized losses   0 0    
Fair value   714 739    
Commercial          
Held-to-maturity debt securities          
Amortized cost, net   1,038 1,070    
Gross unrealized gains   3 4    
Gross unrealized losses   3 2    
Fair value   1,038 1,072    
Mortgage-backed securities          
Held-to-maturity debt securities          
Amortized cost, net   70,740 65,691    
Gross unrealized gains   140 1,083    
Gross unrealized losses   4,037 927    
Fair value   66,843 65,847    
U.S. treasury securities          
Held-to-maturity debt securities          
Amortized cost, net   130,004 111,819    
Gross unrealized gains   26 30    
Gross unrealized losses   7,664 1,632    
Fair value   122,366 110,217    
State and municipal          
Held-to-maturity debt securities          
Amortized cost, net   9,035 8,923    
Gross unrealized gains   185 589    
Gross unrealized losses   236 12    
Fair value   8,984 9,500    
Fair value of securities transferred from AFS to HTM $ 237        
Securities transferred from AFS to HTM, unrealized gain position $ 14        
Foreign government          
Held-to-maturity debt securities          
Amortized cost, net   1,699 1,651    
Gross unrealized gains   1 4    
Gross unrealized losses   64 36    
Fair value   1,636 1,619    
Asset-backed securities          
Held-to-maturity debt securities          
Amortized cost, net   31,069 28,879    
Gross unrealized gains   5 8    
Gross unrealized losses   249 32    
Fair value   $ 30,825 $ 28,855