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INVESTMENTS - Overview (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Investment Holdings        
Total investments $ 514,602   $ 512,822  
Interest and dividends on investments        
Taxable interest 2,013 $ 1,652    
Interest exempt from U.S. federal income tax 5 66    
Dividend income 32 34    
Total interest and dividend income on investments 2,050 1,752    
Gross realized investments losses, excluding losses from other-than-temporary impairment        
Gross realized investment gains 153 460    
Gross realized investment losses (73) (59)    
Net realized gains on sales of investments 80 401    
Debt securities AFS        
Allowance for credit losses 8 $ 5 8 $ 5
Fair value 264,774   288,522  
Debt securities available-for-sale (AFS)        
Investment Holdings        
Total investments 264,774   288,522  
Debt securities held-to-maturity (HTM)        
Investment Holdings        
Total investments 242,547   216,963  
Marketable equity securities carried at fair value | Fair value        
Investment Holdings        
Total investments 483   543  
Non-marketable equity securities | Fair value        
Investment Holdings        
Total investments 474   489  
Non-marketable equity securities | Carried at cost        
Investment Holdings        
Total investments 4,702   4,892  
Non-marketable securities measured using measurement alternative        
Investment Holdings        
Total investments 1,622   1,413  
Mortgage-backed securities - U.S. government-sponsored agency guaranteed        
Debt securities AFS        
Amortized cost 38,431   33,064  
Gross unrealized gains 82   453  
Gross unrealized losses 1,620   301  
Allowance for credit losses 0   0  
Fair value 36,893   33,216  
Mortgage-backed securities - Non-U.S. residential        
Debt securities AFS        
Amortized cost 322   380  
Gross unrealized gains 0   1  
Gross unrealized losses 2   1  
Allowance for credit losses 0   0  
Fair value 320   380  
Commercial        
Debt securities AFS        
Amortized cost 18   25  
Gross unrealized gains 0   0  
Gross unrealized losses 0   0  
Allowance for credit losses 0   0  
Fair value 18   25  
Mortgage-backed securities        
Debt securities AFS        
Amortized cost 38,771   33,469  
Gross unrealized gains 82   454  
Gross unrealized losses 1,622   302  
Allowance for credit losses 0   0  
Fair value 37,231   33,621  
U.S. Treasury        
Debt securities AFS        
Amortized cost 93,433   122,669  
Gross unrealized gains 35   615  
Gross unrealized losses 2,943   844  
Allowance for credit losses 0   0  
Fair value 90,525   122,440  
Agency obligations        
Debt securities AFS        
Amortized cost 0   0  
Gross unrealized gains 0   0  
Gross unrealized losses 0   0  
Allowance for credit losses 0   0  
Fair value 0   0  
U.S. Treasury and federal agency securities        
Debt securities AFS        
Amortized cost 93,433   122,669  
Gross unrealized gains 35   615  
Gross unrealized losses 2,943   844  
Allowance for credit losses 0   0  
Fair value 90,525   122,440  
State and municipal        
Debt securities AFS        
Amortized cost 2,632   2,643  
Gross unrealized gains 26   79  
Gross unrealized losses 154      
Allowance for credit losses 0   0  
Fair value 2,504   2,621  
Foreign government        
Debt securities AFS        
Amortized cost 125,279   119,426  
Gross unrealized gains 239   337  
Gross unrealized losses 2,059   1,023  
Allowance for credit losses 0   0  
Fair value 123,459   118,740  
Corporate        
Debt securities AFS        
Amortized cost 6,159   5,972  
Gross unrealized gains 9   33  
Gross unrealized losses 91   77  
Allowance for credit losses 8   8  
Fair value 6,069   5,920  
Asset-backed securities        
Debt securities AFS        
Amortized cost 296   304  
Gross unrealized gains 1   0  
Gross unrealized losses 1   1  
Allowance for credit losses 0   0  
Fair value 296   303  
Other debt securities        
Debt securities AFS        
Amortized cost 4,700   4,880  
Gross unrealized gains 0   1  
Gross unrealized losses 10   4  
Allowance for credit losses 0   0  
Fair value 4,690   4,877  
Debt securities AFS        
Debt securities AFS        
Amortized cost 271,270   289,363  
Gross unrealized gains 392   1,519  
Gross unrealized losses 6,880   2,352  
Allowance for credit losses 8   8  
Fair value $ 264,774   $ 288,522