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Investments - Unrealized Losses on AFS Securities (Details)
$ in Millions
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions 3,850  
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 $ 604 $ 1,577
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (6) (50)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 1,043 281
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (39) (25)
Debt Securities, Available-for-sale, Unrealized Loss Position 1,647 1,858
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (45) (75)
CLO    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 209 1,490
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (1) (48)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 2,249 1,378
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (16) (54)
Debt Securities, Available-for-sale, Unrealized Loss Position 2,458 2,868
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (17) (102)
CMBS    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 117 2,560
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (7) (270)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 2,837 521
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (341) (88)
Debt Securities, Available-for-sale, Unrealized Loss Position 2,954 3,081
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (348) (358)
Corporate    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 810 11,157
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (10) (1,071)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 11,149 2,575
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (1,003) (521)
Debt Securities, Available-for-sale, Unrealized Loss Position 11,959 13,732
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (1,013) (1,592)
Foreign government/government agencies    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 27 308
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 (26)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 368 224
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (27) (23)
Debt Securities, Available-for-sale, Unrealized Loss Position 395 532
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (27) (49)
Municipal    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 329 4,270
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (3) (461)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 3,196 228
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (296) (54)
Debt Securities, Available-for-sale, Unrealized Loss Position 3,525 4,498
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (299) (515)
Residential mortgage-backed securities ("RMBS")    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 181 2,311
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (3) (249)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 3,207 1,250
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (403) (259)
Debt Securities, Available-for-sale, Unrealized Loss Position 3,388 3,561
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (406) (508)
U.S. Treasuries    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 120 1,554
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (11) (145)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 1,121 633
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (139) (98)
Debt Securities, Available-for-sale, Unrealized Loss Position 1,241 2,187
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (150) (243)
Securities available-for-sale and other    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 2,397 25,227
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (41) (2,320)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 25,170 7,090
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (2,264) (1,122)
Debt Securities, Available-for-sale, Unrealized Loss Position 27,567 32,317
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (2,305) $ (3,442)