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Investments - Investments - Unrealized Losses on AFS Securities (Details)
$ in Millions
Mar. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions 3,648  
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 $ 567 $ 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 306 407
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 18 25
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 873 1,495
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 24 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 900 78
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 2 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 900 78
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 2 0
CMBS    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 146 228
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 2,261 2,299
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 200 244
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 2,407 2,527
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 204 248
Corporate    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 5,022 5,883
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 85 138
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 8,023 8,212
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 777 895
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 13,045 14,095
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 862 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 109 165
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 2 5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 164 178
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 15 18
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 273 343
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 17 23
Municipal    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 1,291 1,263
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 33 27
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 2,580 2,712
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 338 320
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 3,871 3,975
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 371 347
RMBS    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 951 1,297
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 13 29
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 2,635 2,672
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 312 364
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 3,586 3,969
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 325 393
U.S. Treasuries    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 35 406
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 2 26
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 599 461
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 116 118
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 634 867
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 118 144
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 9,021 10,408
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 147 243
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 16,568 16,941
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 1,776 1,984
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 25,589 27,349
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total $ 1,923 $ 2,227