v3.26.3
Investments - Investments - Unrealized Losses on AFS Securities (Details)
$ in Millions
Sep. 30, 2026
USD ($)
Dec. 31, 2025
USD ($)
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions 4,619  
Percentage of Gross Unrealized Losses Depressed Less than Twenty Percent of Cost or Amortized Cost 92.00%  
ABS    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 3,330 $ 405
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 85 2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 184 339
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 20 14
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 3,514 744
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 105 16
Collateralized Loan Obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 572 496
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 3 1
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 572 496
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 3 1
CMBS    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 274 119
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 1,221 1,852
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 170 147
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 1,495 1,971
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 181 150
Corporate    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 14,567 2,372
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 719 34
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 5,834 7,089
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 885 570
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 20,401 9,461
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 1,604 604
Foreign Govt./Govt. Agencies    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 310 39
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 10 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 12 38
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 4 2
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 322 77
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 14 2
Municipal    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 1,820 407
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 110 7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 1,647 2,286
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 348 261
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 3,467 2,693
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 458 268
RMBS    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 3,564 256
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 137 1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 1,819 2,626
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 326 243
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 5,383 2,882
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 463 244
U.S. Treasuries    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 1,022 592
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 66 11
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 541 563
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 190 128
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 1,563 1,155
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total 256 139
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 25,459 4,686
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1,141 59
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 11,258 14,793
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 1,943 1,365
Debt Securities, Available-for-sale, Unrealized Loss Position, Total 36,717 19,479
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total $ 3,084 $ 1,424