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INVESTMENTS - Overview (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Investment Holdings      
Total investments $ 398,883,000,000   $ 368,563,000,000
Interest and dividends on investments      
Taxable interest 2,179,000,000 $ 2,372,000,000  
Interest exempt from U.S. federal income tax 76,000,000 127,000,000  
Dividend income 26,000,000 49,000,000  
Total interest and dividend income 2,281,000,000 2,548,000,000  
Gross realized investments losses, excluding losses from other-than-temporary impairment      
Gross realized investment gains 464,000,000 168,000,000  
Gross realized investment losses (32,000,000) (38,000,000)  
Net realized gains on sale of investments 432,000,000 $ 130,000,000  
Debt securities AFS      
Allowance for AFS securities at the end of the period 0    
Fair value 308,219,000,000   280,265,000,000
Debt securities available-for-sale (AFS)      
Investment Holdings      
Total investments 308,219,000,000   280,265,000,000
Debt securities held-to-maturity securities (HTM)      
Investment Holdings      
Total investments 82,315,000,000   80,775,000,000
Marketable equity securities | Fair value      
Investment Holdings      
Total investments 682,000,000   458,000,000
Non-marketable equity securities | Fair value      
Investment Holdings      
Total investments 532,000,000   704,000,000
Non-marketable equity securities | Carried at cost      
Investment Holdings      
Total investments 6,394,000,000   5,661,000,000
Non-marketable securities, measured using measurement alternative      
Investment Holdings      
Total investments 741,000,000   700,000,000
Mortgage-backed securities - U.S. agency-sponsored      
Debt securities AFS      
Amortized cost 42,559,000,000   34,963,000,000
Gross unrealized gains 1,271,000,000   547,000,000
Gross unrealized losses 277,000,000   280,000,000
Fair value 43,553,000,000   35,230,000,000
Mortgage-backed securities - Non-U.S. residential      
Debt securities AFS      
Amortized cost 752,000,000   789,000,000
Gross unrealized gains 3,000,000   3,000,000
Gross unrealized losses 3,000,000   0
Fair value 752,000,000   792,000,000
Commercial and other      
Debt securities AFS      
Amortized cost 69,000,000   75,000,000
Gross unrealized gains 0   0
Gross unrealized losses 1,000,000   0
Fair value 68,000,000   75,000,000
Mortgage-backed securities      
Debt securities AFS      
Amortized cost 43,380,000,000   35,827,000,000
Gross unrealized gains 1,274,000,000   550,000,000
Gross unrealized losses 281,000,000   280,000,000
Fair value 44,373,000,000   36,097,000,000
U.S. Treasury      
Debt securities AFS      
Amortized cost 118,298,000,000   106,429,000,000
Gross unrealized gains 2,863,000,000   50,000,000
Gross unrealized losses 2,000,000   380,000,000
Fair value 121,159,000,000   106,099,000,000
Agency obligations      
Debt securities AFS      
Amortized cost 4,080,000,000   5,336,000,000
Gross unrealized gains 30,000,000   3,000,000
Gross unrealized losses 7,000,000   20,000,000
Fair value 4,103,000,000   5,319,000,000
U.S. Treasury and federal agency securities      
Debt securities AFS      
Amortized cost 122,378,000,000   111,765,000,000
Gross unrealized gains 2,893,000,000   53,000,000
Gross unrealized losses 9,000,000   400,000,000
Fair value 125,262,000,000   111,418,000,000
State and municipal securities      
Debt securities AFS      
Amortized cost 5,677,000,000   5,024,000,000
Gross unrealized gains 224,000,000   43,000,000
Gross unrealized losses 436,000,000   89,000,000
Fair value 5,465,000,000   4,978,000,000
Foreign government      
Debt securities AFS      
Amortized cost 116,703,000,000   110,958,000,000
Gross unrealized gains 983,000,000   586,000,000
Gross unrealized losses 319,000,000   241,000,000
Fair value 117,367,000,000   111,303,000,000
Corporate      
Debt securities AFS      
Amortized cost 11,243,000,000   11,266,000,000
Gross unrealized gains 116,000,000   52,000,000
Gross unrealized losses 162,000,000   101,000,000
Fair value 11,197,000,000   11,217,000,000
Asset-backed securities      
Debt securities AFS      
Amortized cost 479,000,000   524,000,000
Gross unrealized gains 1,000,000   0
Gross unrealized losses 14,000,000   2,000,000
Fair value 466,000,000   522,000,000
Other debt securities      
Debt securities AFS      
Amortized cost 4,086,000,000   4,729,000,000
Gross unrealized gains 3,000,000   1,000,000
Gross unrealized losses 0   0
Fair value 4,089,000,000   4,730,000,000
Debt securities AFS      
Debt securities AFS      
Amortized cost 303,946,000,000   280,093,000,000
Gross unrealized gains 5,494,000,000   1,285,000,000
Gross unrealized losses 1,221,000,000   1,113,000,000
Fair value $ 308,219,000,000   $ 280,265,000,000