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INVESTMENTS - Debt Securities Held-to-Maturity (Details) - USD ($)
$ in Millions
1 Months Ended
Feb. 28, 2021
Aug. 31, 2020
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Debt Securities Held-to-maturity                
Amortized cost, net     $ 198,056   $ 104,943      
Gross unrealized gains     2,114   3,022      
Gross unrealized losses     1,446   175      
Fair value     198,724   107,790      
Allowance for credit losses on HTM debt securities     73 $ 83 86 $ 98 $ 107 $ 0
Mortgage-backed securities - U.S. government-sponsored agency guaranteed                
Debt Securities Held-to-maturity                
Amortized cost, net     67,517   49,004      
Gross unrealized gains     1,490   2,162      
Gross unrealized losses     533   15      
Fair value     68,474   51,151      
Mortgage-backed securities - Non-U.S. residential                
Debt Securities Held-to-maturity                
Amortized cost, net     739   1,124      
Gross unrealized gains     1   3      
Gross unrealized losses     0   1      
Fair value     740   1,126      
Commercial                
Debt Securities Held-to-maturity                
Amortized cost, net     957   825      
Gross unrealized gains     3   1      
Gross unrealized losses     2   1      
Fair value     958   825      
Mortgage-backed securities                
Debt Securities Held-to-maturity                
Amortized cost, net     69,213   50,953      
Gross unrealized gains     1,494   2,166      
Gross unrealized losses     535   17      
Fair value     70,172   53,102      
U.S. treasury securities                
Debt Securities Held-to-maturity                
Amortized cost, net     88,270   21,293      
Gross unrealized gains     26   4      
Gross unrealized losses     850   55      
Fair value     87,446   21,242      
Fair value of securities transferred from AFS to HTM   $ 13,100            
Securities transferred from AFS to HTM, unrealized gain position   $ 144            
State and municipal                
Debt Securities Held-to-maturity                
Amortized cost, net     8,952   9,185      
Gross unrealized gains     575   755      
Gross unrealized losses     18   11      
Fair value     9,509   9,929      
Fair value of securities transferred from AFS to HTM $ 237              
Securities transferred from AFS to HTM, unrealized gain position $ 14              
Foreign government                
Debt Securities Held-to-maturity                
Amortized cost, net     1,694   1,931      
Gross unrealized gains     10   91      
Gross unrealized losses     16   0      
Fair value     1,688   2,022      
Asset-backed securities                
Debt Securities Held-to-maturity                
Amortized cost, net     29,927   21,581      
Gross unrealized gains     9   6      
Gross unrealized losses     27   92      
Fair value     $ 29,909   $ 21,495