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INVESTMENTS - Fair Value of AFS Securities (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Fair value    
Less than 12 months $ 70,956.0 $ 68,298.0
12 months or longer 100,791.0 98,800.0
Total 171,747.0 167,098.0
Gross unrealized losses    
Less than 12 months 468.0 861.0
12 months or longer 3,071.0 2,933.0
Total 3,539.0 3,794.0
Unallocated portfolio layer cumulative basis adjustments (113.0) 93.0
Debt securities AFS    
Gross unrealized losses    
Unallocated portfolio layer cumulative basis adjustments (100.0)  
U.S. government-sponsored agency guaranteed    
Fair value    
Less than 12 months 10,796.0 8,602.0
12 months or longer 9,367.0 9,734.0
Total 20,163.0 18,336.0
Gross unrealized losses    
Less than 12 months 76.0 86.0
12 months or longer 663.0 648.0
Total 739.0 734.0
Residential    
Fair value    
Less than 12 months 50.0 352.0
12 months or longer 234.0 34.0
Total 284.0 386.0
Gross unrealized losses    
Less than 12 months 2.0 1.0
12 months or longer 1.0 2.0
Total 3.0 3.0
Mortgage-backed securities    
Fair value    
Less than 12 months 10,846.0 8,954.0
12 months or longer 9,601.0 9,768.0
Total 20,447.0 18,722.0
Gross unrealized losses    
Less than 12 months 78.0 87.0
12 months or longer 664.0 650.0
Total 742.0 737.0
U.S. Treasury    
Fair value    
Less than 12 months 10,162.0 11,851.0
12 months or longer 54,381.0 57,669.0
Total 64,543.0 69,520.0
Gross unrealized losses    
Less than 12 months 82.0 113.0
12 months or longer 1,099.0 1,269.0
Total 1,181.0 1,382.0
U.S. Treasury and federal agency securities    
Fair value    
Less than 12 months 10,162.0 11,851.0
12 months or longer 54,381.0 57,669.0
Total 64,543.0 69,520.0
Gross unrealized losses    
Less than 12 months 82.0 113.0
12 months or longer 1,099.0 1,269.0
Total 1,181.0 1,382.0
State and municipal    
Fair value    
Less than 12 months 359.0 906.0
12 months or longer 850.0 324.0
Total 1,209.0 1,230.0
Gross unrealized losses    
Less than 12 months 18.0 17.0
12 months or longer 79.0 74.0
Total 97.0 91.0
Foreign government    
Fair value    
Less than 12 months 44,535.0 42,250.0
12 months or longer 33,951.0 29,176.0
Total 78,486.0 71,426.0
Gross unrealized losses    
Less than 12 months 220.0 540.0
12 months or longer 1,105.0 835.0
Total 1,325.0 1,375.0
Corporate    
Fair value    
Less than 12 months 1,787.0 2,319.0
12 months or longer 1,869.0 1,619.0
Total 3,656.0 3,938.0
Gross unrealized losses    
Less than 12 months 68.0 103.0
12 months or longer 124.0 105.0
Total 192.0 208.0
Asset-backed securities    
Fair value    
Less than 12 months 186.0 154.0
12 months or longer 14.0 16.0
Total 200.0 170.0
Gross unrealized losses    
Less than 12 months 1.0 0.0
12 months or longer 0.0 0.0
Total 1.0 0.0
Other debt securities    
Fair value    
Less than 12 months 3,081.0 1,864.0
12 months or longer 125.0 228.0
Total 3,206.0 2,092.0
Gross unrealized losses    
Less than 12 months 1.0 1.0
12 months or longer 0.0 0.0
Total $ 1.0 $ 1.0