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Investments - Unrealized Losses on AFS Securities (Details)
$ in Millions
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions 3,933  
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 $ 1,088 $ 604
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (14) (6)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 407 1,043
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (25) (39)
Debt Securities, Available-for-sale, Unrealized Loss Position 1,495 1,647
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (39) (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 78 209
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 78 2,458
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 0 (17)
CMBS    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 228 117
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (4) (7)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 2,299 2,837
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (244) (341)
Debt Securities, Available-for-sale, Unrealized Loss Position 2,527 2,954
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (248) (348)
Corporate    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 5,883 810
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (138) (10)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 8,212 11,149
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (895) (1,003)
Debt Securities, Available-for-sale, Unrealized Loss Position 14,095 11,959
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (1,033) (1,013)
Foreign government/government agencies    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 165 27
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (5) 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 178 368
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (18) (27)
Debt Securities, Available-for-sale, Unrealized Loss Position 343 395
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (23) (27)
Municipal    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 1,263 329
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (27) (3)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 2,712 3,196
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (320) (296)
Debt Securities, Available-for-sale, Unrealized Loss Position 3,975 3,525
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (347) (299)
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 1,297 181
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (29) (3)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 2,672 3,207
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (364) (403)
Debt Securities, Available-for-sale, Unrealized Loss Position 3,969 3,388
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (393) (406)
U.S. Treasuries    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 406 120
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (26) (11)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 461 1,121
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (118) (139)
Debt Securities, Available-for-sale, Unrealized Loss Position 867 1,241
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (144) (150)
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 10,408 2,397
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (243) (41)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 16,941 25,170
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (1,984) (2,264)
Debt Securities, Available-for-sale, Unrealized Loss Position 27,349 27,567
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (2,227) $ (2,305)