v3.25.4
Bank Loans and Related Allowance for Credit Losses - Changes in Allowance for Credit Losses (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period $ 21 $ 38 $ 73
Charge-offs 0 0 0
Recoveries 0 0 0
Provision for credit losses 15 (17) (35)
Balance at end of period 36 21 38
Residential real estate      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 15 34 70
Charge-offs 0 0 0
Recoveries 0 0 0
Provision for credit losses 14 (19) (36)
Balance at end of period 29 15 34
Pledged asset lines      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 0 0 0
Charge-offs 0 0 0
Recoveries 0 0 0
Provision for credit losses 0 0 0
Balance at end of period 0 0 0
Other      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 6 4 3
Charge-offs 0 0 0
Recoveries 0 0 0
Provision for credit losses 1 2 1
Balance at end of period 7 6 4
First Mortgages | Residential real estate      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 14 32 66
Charge-offs 0 0 0
Recoveries 0 0 0
Provision for credit losses 14 (18) (34)
Balance at end of period 28 14 32
HELOCs | Residential real estate      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of period 1 2 4
Charge-offs 0 0 0
Recoveries 0 0 0
Provision for credit losses 0 (1) (2)
Balance at end of period $ 1 $ 1 $ 2