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Mortgage Loans - Credit Quality Indicators - MF (Details) - Multifamily - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year $ 7,086 $ 50,350
One fiscal year before 54,781 53,930
Two fiscal years before 53,832 58,780
Three fiscal years before 58,392 63,361
Four fiscal years before 63,026 74,319
Prior 257,465 188,987
Total mortgage loans 494,582 489,727
Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 7,086 49,867
One fiscal year before 54,311 51,194
Two fiscal years before 50,931 49,570
Three fiscal years before 49,399 59,687
Four fiscal years before 59,330 71,657
Prior 243,047 175,887
Total mortgage loans 464,104 457,862
Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 54
One fiscal year before 30 68
Two fiscal years before 72 165
Three fiscal years before 211 353
Four fiscal years before 334 162
Prior 518 280
Total mortgage loans 1,165 1,082
Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 429
One fiscal year before 440 2,626
Two fiscal years before 2,829 9,045
Three fiscal years before 8,777 3,259
Four fiscal years before 3,362 2,500
Prior 13,860 12,820
Total mortgage loans 29,268 30,679
Doubtful    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 0
One fiscal year before 0 42
Two fiscal years before 0 0
Three fiscal years before 5 62
Four fiscal years before 0 0
Prior 40 0
Total mortgage loans 45 104
Current-year write-offs    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 0
One fiscal year before 0 81
Two fiscal years before 16 192
Three fiscal years before 12 16
Four fiscal years before 19 27
Prior 14 189
Total mortgage loans $ 61 $ 505