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INVESTMENTS - Overview (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Investment Holdings                
Total investments $ 500,849   $ 500,849     $ 447,359    
Interest and dividends on investments                
Taxable interest 1,777 $ 1,752 5,152 $ 5,915        
Interest exempt from U.S. federal income tax 73 85 196 231        
Dividend income 35 33 107 102        
Total interest and dividend income on investments 1,885 1,870 5,455 6,248        
Gross realized investments losses, excluding losses from other-than-temporary impairment                
Gross realized investment gains 142 381 757 1,619        
Gross realized investment losses (25) (77) (102) (135)        
Net realized gains on sales of investments 117 304 655 1,484        
Debt securities AFS                
Allowance for credit losses 6 $ 5 6 $ 5 $ 5 5 $ 8 $ 0
Fair value 295,573   295,573     335,084    
Debt securities available-for-sale (AFS)                
Investment Holdings                
Total investments 295,573   295,573     335,084    
Debt securities held-to-maturity (HTM)                
Investment Holdings                
Total investments 198,056   198,056     104,943    
Marketable equity securities carried at fair value | Fair value                
Investment Holdings                
Total investments 379   379     515    
Non-marketable equity securities | Fair value                
Investment Holdings                
Total investments 539   539     551    
Non-marketable equity securities | Carried at cost                
Investment Holdings                
Total investments 4,910   4,910     5,304    
Non-marketable securities measured using measurement alternative                
Investment Holdings                
Total investments 1,392   1,392     962    
Mortgage-backed securities - U.S. government-sponsored agency guaranteed                
Debt securities AFS                
Amortized cost 36,127   36,127     42,836    
Gross unrealized gains 743   743     1,134    
Gross unrealized losses 201   201     52    
Allowance for credit losses 0   0     0    
Fair value 36,669   36,669     43,918    
Mortgage-backed securities - Non-U.S. residential                
Debt securities AFS                
Amortized cost 362   362     568    
Gross unrealized gains 1   1     3    
Gross unrealized losses 0   0     0    
Allowance for credit losses 0   0     0    
Fair value 363   363     571    
Commercial                
Debt securities AFS                
Amortized cost 34   34     49    
Gross unrealized gains 0   0     1    
Gross unrealized losses 0   0     0    
Allowance for credit losses 0   0     0    
Fair value 34   34     50    
Mortgage-backed securities                
Debt securities AFS                
Amortized cost 36,523   36,523     43,453    
Gross unrealized gains 744   744     1,138    
Gross unrealized losses 201   201     52    
Allowance for credit losses 0   0     0    
Fair value 37,066   37,066     44,539    
U.S. Treasury                
Debt securities AFS                
Amortized cost 122,491   122,491     144,094    
Gross unrealized gains 1,119   1,119     2,108    
Gross unrealized losses 436   436     49    
Allowance for credit losses 0   0     0    
Fair value 123,174   123,174     146,153    
Agency obligations                
Debt securities AFS                
Amortized cost 0   0     50    
Gross unrealized gains 0   0     1    
Gross unrealized losses 0   0     0    
Allowance for credit losses 0   0     0    
Fair value 0   0     51    
U.S. Treasury and federal agency securities                
Debt securities AFS                
Amortized cost 122,491   122,491     144,144    
Gross unrealized gains 1,119   1,119     2,109    
Gross unrealized losses 436   436     49    
Allowance for credit losses 0   0     0    
Fair value 123,174   123,174     146,204    
State and municipal                
Debt securities AFS                
Amortized cost 2,710   2,710     3,753    
Gross unrealized gains 85   85     123    
Gross unrealized losses 111   111     157    
Allowance for credit losses 0   0     0    
Fair value 2,684   2,684     3,719    
Foreign government                
Debt securities AFS                
Amortized cost 120,322   120,322     123,467    
Gross unrealized gains 496   496     1,623    
Gross unrealized losses 624   624     122    
Allowance for credit losses 0   0     0    
Fair value 120,194   120,194     124,968    
Corporate                
Debt securities AFS                
Amortized cost 6,929   6,929     10,444    
Gross unrealized gains 70   70     152    
Gross unrealized losses 65   65     91    
Allowance for credit losses 8   8     5    
Fair value 6,926   6,926     10,500    
Asset-backed securities                
Debt securities AFS                
Amortized cost 263   263     277    
Gross unrealized gains 1   1     5    
Gross unrealized losses 0   0     4    
Allowance for credit losses 0   0     0    
Fair value 264   264     278    
Other debt securities                
Debt securities AFS                
Amortized cost 5,265   5,265     4,871    
Gross unrealized gains 1   1     5    
Gross unrealized losses 1   1     0    
Allowance for credit losses 0   0     0    
Fair value 5,265   5,265     4,876    
Debt securities AFS                
Debt securities AFS                
Amortized cost 294,503   294,503     330,409    
Gross unrealized gains 2,516   2,516     5,155    
Gross unrealized losses 1,438   1,438     475    
Allowance for credit losses 8   8     5    
Fair value $ 295,573   $ 295,573     $ 335,084