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Investments - Investments - Unrealized Losses on AFS Securities (Details)
$ in Millions
Sep. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions 3,100  
Percentage of Gross Unrealized Losses Depressed Less than Twenty Percent of Cost or Amortized Cost 96.00%  
ABS    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 180 $ 604
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 469 1,043
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 19 39
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 649 1,647
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 19 45
Collateralized Loan Obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 262 209
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 0 2,249
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 16
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 262 2,458
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 0 17
CMBS    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 36 117
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1 7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 2,491 2,837
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 219 341
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 2,527 2,954
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 220 348
Corporate    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 709 810
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 7 10
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 8,943 11,149
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 677 1,003
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 9,652 11,959
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 684 1,013
Foreign Govt./Govt. Agencies    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 37 27
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 250 368
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 13 27
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 287 395
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 13 27
Municipal    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 251 329
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1 3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 2,907 3,196
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 248 296
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 3,158 3,525
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 249 299
RMBS    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 237 181
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1 3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 2,876 3,207
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 281 403
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 3,113 3,388
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 282 406
U.S. Treasuries    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 205 120
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1 11
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 502 1,121
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 81 139
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 707 1,241
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 82 150
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 1,917 2,397
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 11 41
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 18,438 25,170
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 1,538 2,264
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 20,355 27,567
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total $ 1,549 $ 2,305