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Investments - Investments - Unrealized Losses on AFS Securities (Details)
$ in Millions
Jun. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions 3,135  
Percentage of Gross Unrealized Losses Depressed Less than Twenty Percent of Cost or Amortized Cost 93.00%  
ABS    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 548 $ 1,088
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 6 14
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 248 407
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 17 25
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 796 1,495
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 23 39
Collateralized Loan Obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 555 78
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 0 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 555 78
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 1 0
CMBS    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 107 228
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 5 4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 2,065 2,299
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 178 244
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 2,172 2,527
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 183 248
Corporate    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 3,289 5,883
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 66 138
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 7,372 8,212
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 660 895
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 10,661 14,095
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 726 1,033
Foreign Govt./Govt. Agencies    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 50 165
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 85 178
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 5 18
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 135 343
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 5 23
Municipal    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 1,034 1,263
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 35 27
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 2,427 2,712
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 355 320
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 3,461 3,975
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 390 347
RMBS    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 982 1,297
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 14 29
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 2,548 2,672
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 295 364
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 3,530 3,969
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 309 393
U.S. Treasuries    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 229 406
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 8 26
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 577 461
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 129 118
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 806 867
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 137 144
Available-for-sale Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 6,794 10,408
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 135 243
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 15,322 16,941
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 1,639 1,984
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 22,116 27,349
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total $ 1,774 $ 2,227