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INVESTMENTS - Overview (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2018
Investment Holdings        
Investments $ 447,359 $ 368,563    
Interest and dividends on investments        
Taxable interest 7,554 9,269 $ 8,704  
Interest exempt from U.S. federal income tax 301 404 521  
Dividend income 134 187 269  
Total interest and dividend income on investments 7,989 9,860 9,494  
Gross realized investments losses, excluding losses from other-than-temporary impairment        
Gross realized investment gains 1,895 1,599 682  
Gross realized investment losses (139) (125) (261)  
Net realized gains on sales of investments $ 1,756 1,474 421  
HTM securities sold, percent of principal collected, minimum 85.00%      
Available-for-sale Securities transferred from Held-to-maturity        
Held-to-maturity debt securities sold     61  
Held-to-maturity debt securities reclassified to available for sale     $ 8  
Securities available-for-sale        
Amortized cost $ 330,409 280,093    
Allowance for credit losses 5 0    
Fair value 335,084 280,265   $ 4,000
Less than 12 months $ 280 802    
Percentage of investments gross-unrealized loss position for less than a year, rated investment grade 70.00%      
12 months or longer $ 85 311    
Percentage of gross-unrealized loss position for a year or more rated investment grade 78.00%      
Debt securities available-for-sale (AFS)        
Investment Holdings        
Investments $ 335,084 280,265    
HTM debt securities        
Investment Holdings        
Investments 104,943 80,775    
Marketable equity securities | Fair value        
Investment Holdings        
Investments 515 458    
Non-marketable equity securities | Fair value        
Investment Holdings        
Investments 551 704    
Non-marketable equity securities | Carried at cost        
Investment Holdings        
Investments 5,304 5,661    
Non-marketable equity securities measured using the measurement alternative        
Investment Holdings        
Investments 962 700    
Mortgage-backed securities - U.S. government-sponsored agency guaranteed        
Securities available-for-sale        
Amortized cost 42,836 34,963    
Gross unrealized gains 1,134 547    
Gross unrealized losses 52 280    
Allowance for credit losses 0      
Fair value 43,918 35,230    
Less than 12 months 30 242    
12 months or longer 22 38    
Mortgage-backed securities - Non-U.S. residential        
Securities available-for-sale        
Amortized cost 568 789    
Gross unrealized gains 3 3    
Gross unrealized losses 0 0    
Allowance for credit losses 0      
Fair value 571 792    
Less than 12 months 0 0    
12 months or longer 0 0    
Mortgage-backed securities - Commercial        
Securities available-for-sale        
Amortized cost 49 75    
Gross unrealized gains 1 0    
Gross unrealized losses 0 0    
Allowance for credit losses 0      
Fair value 50 75    
Less than 12 months 0 0    
12 months or longer 0 0    
Mortgage-backed securities        
Securities available-for-sale        
Amortized cost 43,453 35,827    
Gross unrealized gains 1,138 550    
Gross unrealized losses 52 280    
Allowance for credit losses 0      
Fair value 44,539 36,097    
Less than 12 months 30 242    
12 months or longer 22 38    
U.S. Treasury        
Securities available-for-sale        
Amortized cost 144,094 106,429    
Gross unrealized gains 2,108 50    
Gross unrealized losses 49 380    
Allowance for credit losses 0      
Fair value 146,153 106,099    
Less than 12 months 49 248    
12 months or longer 0 132    
Agency obligations        
Securities available-for-sale        
Amortized cost 50 5,336    
Gross unrealized gains 1 3    
Gross unrealized losses 0 20    
Allowance for credit losses 0      
Fair value 51 5,319    
Less than 12 months 0 2    
12 months or longer 0 18    
U.S. Treasury and federal agency securities        
Securities available-for-sale        
Amortized cost 144,144 111,765    
Gross unrealized gains 2,109 53    
Gross unrealized losses 49 400    
Allowance for credit losses 0      
Fair value 146,204 111,418    
Less than 12 months 49 250    
12 months or longer 0 150    
State and municipal        
Securities available-for-sale        
Amortized cost 3,753 5,024    
Gross unrealized gains 13 43    
Gross unrealized losses 47 89    
Allowance for credit losses 0      
Fair value 3,719 4,978    
Less than 12 months 47 62    
12 months or longer 0 27    
Foreign government        
Securities available-for-sale        
Amortized cost 123,467 110,958    
Gross unrealized gains 1,623 586    
Gross unrealized losses 122 241    
Allowance for credit losses 0      
Fair value 124,968 111,303    
Less than 12 months 61 149    
12 months or longer 61 92    
Corporate        
Securities available-for-sale        
Amortized cost 10,444 11,266    
Gross unrealized gains 152 52    
Gross unrealized losses 91 101    
Allowance for credit losses 5      
Fair value 10,500 11,217    
Less than 12 months 90 98    
12 months or longer 1 3    
Asset-backed securities        
Securities available-for-sale        
Amortized cost 277 524    
Gross unrealized gains 5 0    
Gross unrealized losses 4 2    
Allowance for credit losses 0      
Fair value 278 522    
Less than 12 months 3 1    
12 months or longer 1 1    
Other debt securities        
Securities available-for-sale        
Amortized cost 4,871 4,729    
Gross unrealized gains 5 1    
Gross unrealized losses 0 0    
Allowance for credit losses 0      
Fair value 4,876 4,730    
Less than 12 months 0 0    
12 months or longer 0 0    
Debt securities        
Securities available-for-sale        
Amortized cost 330,409 280,093    
Gross unrealized gains 5,045 1,285    
Gross unrealized losses 365 1,113    
Allowance for credit losses 5      
Fair value $ 335,084 $ 280,265