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INVESTMENTS - Overview (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Investment Holdings                
Total investments $ 487,063   $ 487,063     $ 447,359    
Interest and dividends on investments                
Taxable interest 1,723 $ 1,984 3,375 $ 4,163        
Interest exempt from U.S. federal income tax 57 70 123 146        
Dividend income 38 43 72 69        
Total interest and dividend income on investments 1,818 2,097 3,570 4,378        
Gross realized investments losses, excluding losses from other-than-temporary impairment                
Gross realized investment gains 155 775 615 1,237        
Gross realized investment losses (18) (27) (77) (57)        
Net realized gains on sales of investments 137 748 538 1,180        
Debt securities AFS                
Allowance for credit losses 5 $ 8 5 $ 8 $ 5 5 $ 0 $ 0
Fair value 302,977   302,977     335,084    
Debt securities available-for-sale (AFS)                
Investment Holdings                
Total investments 302,977   302,977     335,084    
Debt securities held-to-maturity (HTM)                
Investment Holdings                
Total investments 176,742   176,742     104,943    
Marketable equity securities carried at fair value | Fair value                
Investment Holdings                
Total investments 195   195     515    
Non-marketable equity securities | Fair value                
Investment Holdings                
Total investments 598   598     551    
Non-marketable equity securities | Carried at cost                
Investment Holdings                
Total investments 5,170   5,170     5,304    
Non-marketable securities measured using measurement alternative                
Investment Holdings                
Total investments 1,381   1,381     962    
Mortgage-backed securities - U.S. government-sponsored agency guaranteed                
Debt securities AFS                
Amortized cost 38,842   38,842     42,836    
Gross unrealized gains 697   697     1,134    
Gross unrealized losses 229   229     52    
Allowance for credit losses 0   0     0    
Fair value 39,310   39,310     43,918    
Mortgage-backed securities - Non-U.S. residential                
Debt securities AFS                
Amortized cost 403   403     568    
Gross unrealized gains 1   1     3    
Gross unrealized losses 0   0     0    
Allowance for credit losses 0   0     0    
Fair value 404   404     571    
Commercial                
Debt securities AFS                
Amortized cost 43   43     49    
Gross unrealized gains 0   0     1    
Gross unrealized losses 0   0     0    
Allowance for credit losses 0   0     0    
Fair value 43   43     50    
Mortgage-backed securities                
Debt securities AFS                
Amortized cost 39,288   39,288     43,453    
Gross unrealized gains 698   698     1,138    
Gross unrealized losses 229   229     52    
Allowance for credit losses 0   0     0    
Fair value 39,757   39,757     44,539    
U.S. Treasury                
Debt securities AFS                
Amortized cost 125,224   125,224     144,094    
Gross unrealized gains 1,336   1,336     2,108    
Gross unrealized losses 413   413     49    
Allowance for credit losses 0   0     0    
Fair value 126,147   126,147     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 125,224   125,224     144,144    
Gross unrealized gains 1,336   1,336     2,109    
Gross unrealized losses 413   413     49    
Allowance for credit losses 0   0     0    
Fair value 126,147   126,147     146,204    
State and municipal                
Debt securities AFS                
Amortized cost 3,096   3,096     3,753    
Gross unrealized gains 95   95     123    
Gross unrealized losses 112   112     157    
Allowance for credit losses 0   0     0    
Fair value 3,079   3,079     3,719    
Foreign government                
Debt securities AFS                
Amortized cost 120,122   120,122     123,467    
Gross unrealized gains 587   587     1,623    
Gross unrealized losses 492   492     122    
Allowance for credit losses 0   0     0    
Fair value 120,217   120,217     124,968    
Corporate                
Debt securities AFS                
Amortized cost 7,902   7,902     10,444    
Gross unrealized gains 74   74     152    
Gross unrealized losses 68   68     91    
Allowance for credit losses 5   5     5    
Fair value 7,903   7,903     10,500    
Asset-backed securities                
Debt securities AFS                
Amortized cost 211   211     277    
Gross unrealized gains 0   0     5    
Gross unrealized losses 0   0     4    
Allowance for credit losses 0   0     0    
Fair value 211   211     278    
Other debt securities                
Debt securities AFS                
Amortized cost 5,661   5,661     4,871    
Gross unrealized gains 2   2     5    
Gross unrealized losses 0   0     0    
Allowance for credit losses 0   0     0    
Fair value 5,663   5,663     4,876    
Debt securities AFS                
Debt securities AFS                
Amortized cost 301,504   301,504     330,409    
Gross unrealized gains 2,792   2,792     5,155    
Gross unrealized losses 1,314   1,314     475    
Allowance for credit losses 5   5     5    
Fair value $ 302,977   $ 302,977     $ 335,084