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Mortgage Loans - Credit Quality Indicators - MF (Details) - Multifamily - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year $ 23,740 $ 50,350
One fiscal year before 54,689 53,930
Two fiscal years before 53,422 58,780
Three fiscal years before 57,804 63,361
Four fiscal years before 62,660 74,319
Prior 248,325 188,987
Total mortgage loans 500,640 489,727
Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 23,740 49,867
One fiscal year before 54,011 51,194
Two fiscal years before 50,374 49,570
Three fiscal years before 49,448 59,687
Four fiscal years before 59,102 71,657
Prior 234,560 175,887
Total mortgage loans 471,235 457,862
Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 54
One fiscal year before 50 68
Two fiscal years before 33 165
Three fiscal years before 206 353
Four fiscal years before 353 162
Prior 667 280
Total mortgage loans 1,309 1,082
Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 429
One fiscal year before 625 2,626
Two fiscal years before 3,015 9,045
Three fiscal years before 8,150 3,259
Four fiscal years before 3,203 2,500
Prior 13,046 12,820
Total mortgage loans 28,039 30,679
Doubtful    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 0
One fiscal year before 3 42
Two fiscal years before 0 0
Three fiscal years before 0 62
Four fiscal years before 2 0
Prior 52 0
Total mortgage loans 57 104
Current-year write-offs    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 0
One fiscal year before 3 81
Two fiscal years before 60 192
Three fiscal years before 54 16
Four fiscal years before 36 27
Prior 30 189
Total mortgage loans $ 183 $ 505