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Investments - Investments - Unrealized Losses on AFS Securities (Details)
$ in Millions
Sep. 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 2,780  
Percentage of Gross Unrealized Losses Depressed Less than Twenty Percent of Cost or Amortized Cost 95.00%  
ABS    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 316 $ 1,088
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 2 14
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 259 407
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 15 25
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 575 1,495
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 17 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 235 78
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 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 235 78
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 0 0
CMBS    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 114 228
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 4 4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 1,998 2,299
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 161 244
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 2,112 2,527
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 165 248
Corporate    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 1,640 5,883
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 23 138
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 7,019 8,212
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 563 895
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 8,659 14,095
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 586 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 46 165
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 83 178
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 3 18
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 129 343
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 3 23
Municipal    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 553 1,263
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 13 27
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 2,283 2,712
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 278 320
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 2,836 3,975
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 291 347
RMBS    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 534 1,297
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 5 29
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 2,509 2,672
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 260 364
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 3,043 3,969
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 265 393
U.S. Treasuries    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 221 406
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 5 26
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 571 461
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 120 118
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 792 867
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 125 144
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 3,659 10,408
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 52 243
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 14,722 16,941
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 1,400 1,984
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 18,381 27,349
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total $ 1,452 $ 2,227