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Allowance for Loan Losses and Reserve for Guaranty Losses Allowance Rollforward (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Allowance for Loan Losses [Roll Forward]      
Beginning balance $ 72,156 $ 61,556 $ 9,925
(Benefit) provision for loan losses (1,191) [1] 25,914 [1] 24,702 [1]
Charge-offs (15,139) [2],[3] (21,170) [2],[3] (22,878) [2],[3]
Recoveries 1,784 5,272 3,077
Transfers 0 [4] 0 [4] 0 [4]
Other 1,185 [5] 584 [5] 3,154 [5]
Ending balance 58,795 72,156 61,556
Fannie Mae [Member]
     
Allowance for Loan Losses [Roll Forward]      
Beginning balance 57,309 48,530 8,078
Adoption of consolidation accounting guidance     0 [6]
(Benefit) provision for loan losses (1,613) [1] 14,080 [1] 13,067 [1]
Charge-offs (14,316) [2],[3] (19,398) [2],[3] (15,852) [2],[3]
Recoveries 1,632 3,636 1,913
Transfers 6,466 [4] 9,980 [4] 44,714 [4]
Other 1,041 [5] 481 [5] (3,390) [5]
Ending balance 50,519 57,309 48,530
Consolidated Trusts [Member]
     
Allowance for Loan Losses [Roll Forward]      
Beginning balance 14,847 13,026 1,847
(Benefit) provision for loan losses 422 [1] 11,834 [1] 11,635 [1]
Charge-offs (823) [2],[3] (1,772) [2],[3] (7,026) [2],[3]
Recoveries 152 1,636 1,164
Transfers (6,466) [4] (9,980) [4] (44,714) [4]
Other 144 [5] 103 [5] 6,544 [5]
Ending balance 8,276 14,847 13,026
Single-Family [Member]
     
Allowance for Loan Losses [Roll Forward]      
Beginning balance 70,633 59,980 8,470
Adoption of consolidation accounting guidance     43,170 [6]
(Benefit) provision for loan losses (1,017) [1] 25,623 [1] 24,515 [1]
Charge-offs (14,878) [2],[3] (20,798) [2],[3] (22,464) [2],[3]
Recoveries 1,784 5,272 3,077
Transfers 0 [4] 0 [4] 0 [4]
Other 1,165 [5] 556 [5] 3,212 [5]
Ending balance 57,687 70,633 59,980
Single-Family [Member] | Fannie Mae [Member]
     
Allowance for Loan Losses [Roll Forward]      
Beginning balance 56,294 47,377 6,721
Adoption of consolidation accounting guidance     0 [6]
(Benefit) provision for loan losses (1,482) [1] 13,940 [1] 12,923 [1]
Charge-offs (14,055) [2],[3] (19,026) [2],[3] (15,438) [2],[3]
Recoveries 1,632 3,636 1,913
Transfers 6,437 [4] 9,901 [4] 44,599 [4]
Other 1,022 [5] 466 [5] (3,341) [5]
Ending balance 49,848 56,294 47,377
Single-Family [Member] | Consolidated Trusts [Member]
     
Allowance for Loan Losses [Roll Forward]      
Beginning balance 14,339 12,603 1,749
Adoption of consolidation accounting guidance     43,170 [6]
(Benefit) provision for loan losses 465 [1] 11,683 [1] 11,592 [1]
Charge-offs (823) [2],[3] (1,772) [2],[3] (7,026) [2],[3]
Recoveries 152 1,636 1,164
Transfers (6,437) [4] (9,901) [4] (44,599) [4]
Other 143 [5] 90 [5] 6,553 [5]
Ending balance 7,839 14,339 12,603
Multifamily [Member]
     
Allowance for Loan Losses [Roll Forward]      
Beginning balance 1,523 1,576 1,455
Adoption of consolidation accounting guidance     406 [6]
(Benefit) provision for loan losses (174) [1] 291 [1] 187 [1]
Charge-offs (261) [2],[3] (372) [2],[3] (414) [2],[3]
Transfers 0 [4] 0 [4] 0 [4]
Other 20 [5] 28 [5] (58) [5]
Ending balance 1,108 1,523 1,576
Multifamily [Member] | Fannie Mae [Member]
     
Allowance for Loan Losses [Roll Forward]      
Beginning balance 1,015 1,153 1,357
Adoption of consolidation accounting guidance     0 [6]
(Benefit) provision for loan losses (131) [1] 140 [1] 144 [1]
Charge-offs (261) [2],[3] (372) [2],[3] (414) [2],[3]
Transfers 29 [4] 79 [4] 115 [4]
Other 19 [5] 15 [5] (49) [5]
Ending balance 671 1,015 1,153
Multifamily [Member] | Consolidated Trusts [Member]
     
Allowance for Loan Losses [Roll Forward]      
Beginning balance 508 423 98
Adoption of consolidation accounting guidance     406 [6]
(Benefit) provision for loan losses (43) [1] 151 [1] 43 [1]
Charge-offs 0 [2],[3] 0 [2],[3] 0 [2],[3]
Transfers (29) [4] (79) [4] (115) [4]
Other 1 [5] 13 [5] (9) [5]
Ending balance 437 508 423
Interest Receivable [Member]
     
Allowance for Loan Losses [Roll Forward]      
Charge-offs (872) (1,400) (2,400)
Interest Receivable [Member] | Fannie Mae [Member]
     
Allowance for Loan Losses [Roll Forward]      
Ending balance 1,500 2,200  
Interest Receivable [Member] | Consolidated Trusts [Member]
     
Allowance for Loan Losses [Roll Forward]      
Ending balance 192 336  
Interest Receivable [Member] | Single-Family [Member]
     
Allowance for Loan Losses [Roll Forward]      
Charge-offs (843) (1,400) (2,300)
Interest Receivable [Member] | Multifamily [Member]
     
Allowance for Loan Losses [Roll Forward]      
Charge-offs (29) (46) (64)
Consolidation Acounting Guidance Adopted on January 1, 2010 [Member]
     
Allowance for Loan Losses [Roll Forward]      
Adoption of consolidation accounting guidance     43,576 [6]
Consolidation Acounting Guidance Adopted on January 1, 2010 [Member] | Consolidated Trusts [Member]
     
Allowance for Loan Losses [Roll Forward]      
Adoption of consolidation accounting guidance     43,576 [6]
Consolidation Acounting Guidance Adopted on January 1, 2010 [Member] | Interest Receivable [Member]
     
Allowance for Loan Losses [Roll Forward]      
Adoption of consolidation accounting guidance     $ 7,000
[1] (Benefit) provision for loan losses is included in benefit (provision) for credit losses in our consolidated statements of operations and comprehensive income (loss).
[2] Total charge-offs include accrued interest of $872 million, $1.4 billion and $2.4 billion for the years ended December 31, 2012, 2011 and 2010, respectively. Single-family charge-offs include accrued interest of $843 million, $1.4 billion and $2.3 billion for the years ended December 31, 2012, 2011 and 2010, respectively. Multifamily charge-offs include accrued interest of $29 million, $46 million and $64 million for the years ended December 31, 2012, 2011 and 2010, respectively.
[3] While we purchase the substantial majority of loans that are four or more months delinquent from our MBS trusts, we do not exercise this option to purchase loans during a forbearance period. Charge-offs of consolidated trusts generally represent loans that remained in our consolidated trusts at the time of default.
[4] Includes transfers from trusts for delinquent loan purchases.
[5] Amounts represent the net activity recorded in our allowances for accrued interest receivable and preforeclosure property taxes and insurance receivable from borrowers. The (benefit) provision for credit losses, charge-offs, recoveries and transfer activity included in this table reflects all changes for both the allowance for loan losses and the valuation allowances for accrued interest and preforeclosure property taxes and insurance receivable that relate to the mortgage loans.
[6] Upon recognition of the mortgage loans held by newly consolidated trusts and the associated accrued interest receivable at the transition date of our adoption of the consolidation accounting guidance on January 1, 2010, we increased our “Allowance for loan losses” by $43.6 billion, increased our “Allowance for accrued interest receivable” by $7.0 billion and decreased our “Reserve for guaranty losses” by $54.1 billion. The net decrease of $3.5 billion reflects the difference in the methodology used to estimate incurred losses for our allowance for loan losses and accrued interest receivable versus our reserve for guaranty losses.