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INVESTMENTS - Overview (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Investment Holdings      
Investments $ 368,563 $ 358,607  
Interest and dividends on investments      
Taxable interest 9,269 8,704 $ 7,538
Interest exempt from U.S. federal income tax 404 521 535
Dividend income 187 269 222
Total interest and dividend income 9,860 9,494 8,295
Gross realized investments losses, excluding losses from other-than-temporary impairment      
Gross realized investment gains 1,599 682 1,039
Gross realized investment losses (125) (261) (261)
Net realized gains on sale of investments $ 1,474 421 778
HTM securities sold, percent of principal collected, minimum 85.00%    
Available-for-sale Securities transferred from Held-to-maturity      
Carrying value of HTM debt securities sold $ 0 61 81
Net realized gain (loss) on sale of HTM debt securities 0 0 13
Carrying value of debt securities reclassified to AFS 0 8 74
OTTI losses on debt securities reclassified to AFS 0 0 $ 0
Securities available-for-sale      
Amortized cost 280,093 290,423  
Gross unrealized losses 1,113    
Fair value 280,265 288,038  
Less than 12 months $ 802 752  
Percentage of investments gross-unrealized loss position for less than a year, rated investment grade 93.00%    
12 months or longer $ 311 2,468  
Percentage of gross-unrealized loss position for a year or more rated investment grade 92.00%    
Debt securities available-for-sale (AFS)      
Investment Holdings      
Investments $ 280,265 288,038  
HTM debt securities      
Investment Holdings      
Investments 80,775 63,357  
Marketable equity securities | Fair value      
Investment Holdings      
Investments 458 220  
Non-marketable equity securities | Fair value      
Investment Holdings      
Investments 704 889  
Non-marketable equity securities | Carried at cost      
Investment Holdings      
Investments 5,661 5,565  
Non-marketable equity securities measured using the measurement alternative [Member]      
Investment Holdings      
Investments 700 538  
Mortgage-backed securities - U.S. government-sponsored agency guaranteed      
Securities available-for-sale      
Amortized cost 34,963 43,504  
Gross unrealized gains 547 241  
Gross unrealized losses 280 725  
Fair value 35,230 43,020  
Less than 12 months 242 286  
12 months or longer 38 439  
Mortgage-backed securities - Non-U.S. residential      
Securities available-for-sale      
Amortized cost 789 1,310  
Gross unrealized gains 3 4  
Gross unrealized losses 0 2  
Fair value 792 1,312  
Less than 12 months 0 2  
12 months or longer 0 0  
Mortgage-backed securities - Commercial      
Securities available-for-sale      
Amortized cost 75 174  
Gross unrealized gains 0 1  
Gross unrealized losses 0 2  
Fair value 75 173  
Less than 12 months 0 1  
12 months or longer 0 1  
Mortgage-backed securities      
Securities available-for-sale      
Amortized cost 35,827 44,988  
Gross unrealized gains 550 246  
Gross unrealized losses 280 729  
Fair value 36,097 44,505  
Less than 12 months 242 289  
12 months or longer 38 440  
U.S. Treasury      
Securities available-for-sale      
Amortized cost 106,429 109,376  
Gross unrealized gains 50 33  
Gross unrealized losses 380 1,339  
Fair value 106,099 108,070  
Less than 12 months 248 42  
12 months or longer 132 1,297  
Agency obligations      
Securities available-for-sale      
Amortized cost 5,336 9,283  
Gross unrealized gains 3 1  
Gross unrealized losses 20 132  
Fair value 5,319 9,152  
Less than 12 months 2 2  
12 months or longer 18 130  
U.S. Treasury and federal agency securities      
Securities available-for-sale      
Amortized cost 111,765 118,659  
Gross unrealized gains 53 34  
Gross unrealized losses 400 1,471  
Fair value 111,418 117,222  
Less than 12 months 250 44  
12 months or longer 150 1,427  
State and municipal securities      
Securities available-for-sale      
Amortized cost 5,024 9,372  
Gross unrealized gains 43 96  
Gross unrealized losses 89 262  
Fair value 4,978 9,206  
Less than 12 months 62 34  
12 months or longer 27 228  
Foreign government      
Securities available-for-sale      
Amortized cost 110,958 100,872  
Gross unrealized gains 586 415  
Gross unrealized losses 241 596  
Fair value 111,303 100,691  
Less than 12 months 149 265  
12 months or longer 92 331  
Corporate      
Securities available-for-sale      
Amortized cost 11,266 11,714  
Gross unrealized gains 52 42  
Gross unrealized losses 101 157  
Fair value 11,217 11,599  
Less than 12 months 98 115  
12 months or longer 3 42  
Asset-backed securities      
Securities available-for-sale      
Amortized cost 524 845  
Gross unrealized gains 0 2  
Gross unrealized losses 2 4  
Fair value 522 843  
Less than 12 months 1 4  
12 months or longer 1 0  
Other debt securities      
Securities available-for-sale      
Amortized cost 4,729 3,973  
Gross unrealized gains 1 0  
Gross unrealized losses 0 1  
Fair value 4,730 3,972  
Less than 12 months 0 1  
12 months or longer 0 0  
Debt securities      
Securities available-for-sale      
Amortized cost 280,093 290,423  
Gross unrealized gains 1,285 835  
Gross unrealized losses 1,113 3,220  
Fair value $ 280,265 $ 288,038