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Investments - Investments - Unrealized Losses on AFS Securities (Details)
$ in Millions
Jun. 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 4,033  
Percentage of Gross Unrealized Losses Depressed Less than Twenty Percent of Cost or Amortized Cost 94.00%  
ABS    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 570 $ 604
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 2 6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 775 1,043
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 36 39
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 1,345 1,647
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 38 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 474 209
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1 1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 68 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 542 2,458
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 1 17
CMBS    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 126 117
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 2,640 2,837
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 300 341
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 2,766 2,954
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 301 348
Corporate    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 3,476 810
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 54 10
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 10,653 11,149
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 1,096 1,003
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 14,129 11,959
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 1,150 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 94 27
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 340 368
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 25 27
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 434 395
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 26 27
Municipal    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 680 329
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 11 3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 3,021 3,196
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 330 296
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 3,701 3,525
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 341 299
RMBS    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 865 181
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 13 3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 2,971 3,207
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 414 403
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 3,836 3,388
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 427 406
U.S. Treasuries    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 198 120
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 13 11
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 794 1,121
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 144 139
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 992 1,241
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 157 150
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 6,483 2,397
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 96 41
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 21,262 25,170
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 2,345 2,264
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 27,745 27,567
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total $ 2,441 $ 2,305