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Fair Value Level 3 Reconciliation (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Net unrealized gains (losses) included in net income (loss) related to assets still held $ 425 $ 148 $ 15
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Total realized and unrealized gains (losses) included in net income 714 126 (457)
Interest Income [Member]
     
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Net unrealized gains (losses) included in net income (loss) related to assets still held 0 0 (3)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Total realized and unrealized gains (losses) included in net income 275 272 (327)
Fair Value Gains, Net [Member]
     
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Net unrealized gains (losses) included in net income (loss) related to assets still held 425 148 18
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Total realized and unrealized gains (losses) included in net income 424 326 86
Net OTTI [Member]
     
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Net unrealized gains (losses) included in net income (loss) related to assets still held 0 0 0
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Total realized and unrealized gains (losses) included in net income (26) (484) (229)
Other [Member]
     
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Net unrealized gains (losses) included in net income (loss) related to assets still held 0 0 0
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Total realized and unrealized gains (losses) included in net income 41 12 13
Trading securities [Member]
     
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 2,286 4,238 4,576
Total gain (loss) (realized/unrealized) included in net income (loss) 469 307 50
Total gains or (losses) (realized/unrealized) included in other comprehensive income (loss) 0 [1] 0 [1] 0 [1]
Purchases 0 [2] 0 [2] 672 [2]
Sales (50) [2] (33) [2] (170) [2]
Issues 0 [3] 0 [3] 0 [3]
Settlements (304) [3] (409) [3] (678) [3]
Transfers out of Level 3 (438) [4] (2,497) [4] (971) [4]
Transfers Into Level 3 811 [4] 680 [4] 759 [4]
Ending Balance 2,774 2,286 4,238
Net unrealized gains (losses) included in net income (loss) related to assets still held 430 [5] 177 [5] 54 [5]
Trading securities [Member] | Fannie Mae [Member]
     
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 68 1,737 2,202
Total gain (loss) (realized/unrealized) included in net income (loss) (9) (2) 14
Total gains or (losses) (realized/unrealized) included in other comprehensive income (loss) 0 [1] 0 [1] 0 [1]
Purchases 0 [2] 0 [2] 663 [2]
Sales 0 [2] (33) [2] (161) [2]
Issues 0 [3] 0 [3] 0 [3]
Settlements (17) [3] (118) [3] (433) [3]
Transfers out of Level 3 0 [4] (1,581) [4] (600) [4]
Transfers Into Level 3 0 [4] 65 [4] 52 [4]
Ending Balance 42 68 1,737
Net unrealized gains (losses) included in net income (loss) related to assets still held (9) [5] (6) [5] 36 [5]
Trading securities [Member] | Freddie Mac [Member]
     
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 2 0  
Total gain (loss) (realized/unrealized) included in net income (loss) 0 0  
Total gains or (losses) (realized/unrealized) included in other comprehensive income (loss) 0 [1] 0 [1]  
Purchases 0 [2] 0 [2]  
Sales 0 [2] 0 [2]  
Issues 0 [3] 0 [3]  
Settlements 0 [3] 0 [3]  
Transfers out of Level 3 0 [4] 0 [4]  
Transfers Into Level 3 0 [4] 2 [4]  
Ending Balance 2 2  
Net unrealized gains (losses) included in net income (loss) related to assets still held 0 [5] 0 [5]  
Trading securities [Member] | Ginnie Mae [Member]
     
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 1 9 0
Total gain (loss) (realized/unrealized) included in net income (loss) 0 0 0
Total gains or (losses) (realized/unrealized) included in other comprehensive income (loss) 0 [1] 0 [1] 0 [1]
Purchases 0 [2] 0 [2] 9 [2]
Sales 0 [2] 0 [2] (9) [2]
Issues 0 [3] 0 [3] 0 [3]
Settlements (1) [3] 0 [3] 0 [3]
Transfers out of Level 3 (3) [4] (9) [4] (27) [4]
Transfers Into Level 3 3 [4] 1 [4] 36 [4]
Ending Balance 0 1 9
Net unrealized gains (losses) included in net income (loss) related to assets still held 0 [5] 0 [5] 0 [5]
Trading securities [Member] | Alt-A private-label securities [Member]
     
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 104 345 20
Total gain (loss) (realized/unrealized) included in net income (loss) 256 165 19
Total gains or (losses) (realized/unrealized) included in other comprehensive income (loss) 0 [1] 0 [1] 0 [1]
Purchases 0 [2] 0 [2] 0 [2]
Sales 0 [2] 0 [2] 0 [2]
Issues 0 [3] 0 [3] 0 [3]
Settlements (115) [3] (111) [3] (32) [3]
Transfers out of Level 3 (435) [4] (907) [4] (188) [4]
Transfers Into Level 3 808 [4] 612 [4] 526 [4]
Ending Balance 618 104 345
Net unrealized gains (losses) included in net income (loss) related to assets still held 223 [5] 39 [5] (1) [5]
Trading securities [Member] | Subprime private-label securities [Member]
     
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 1,319 1,280 1,581
Total gain (loss) (realized/unrealized) included in net income (loss) 328 192 (125)
Total gains or (losses) (realized/unrealized) included in other comprehensive income (loss) 0 [1] 0 [1] 0 [1]
Purchases 0 [2] 0 [2] 0 [2]
Sales (50) [2] 0 [2] 0 [2]
Issues 0 [3] 0 [3] 0 [3]
Settlements (149) [3] (153) [3] (176) [3]
Transfers out of Level 3 0 [4] 0 [4] 0 [4]
Transfers Into Level 3 0 [4] 0 [4] 0 [4]
Ending Balance 1,448 1,319 1,280
Net unrealized gains (losses) included in net income (loss) related to assets still held 322 [5] 192 [5] (125) [5]
Trading securities [Member] | Mortgage revenue bonds [Member]
     
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 675 724 609
Total gain (loss) (realized/unrealized) included in net income (loss) (101) (29) 141
Total gains or (losses) (realized/unrealized) included in other comprehensive income (loss) 0 [1] 0 [1] 0 [1]
Purchases 0 [2] 0 [2] 0 [2]
Sales 0 [2] 0 [2] 0 [2]
Issues 0 [3] 0 [3] 0 [3]
Settlements (9) [3] (20) [3] (26) [3]
Transfers out of Level 3 0 [4] 0 [4] 0 [4]
Transfers Into Level 3 0 [4] 0 [4] 0 [4]
Ending Balance 565 675 724
Net unrealized gains (losses) included in net income (loss) related to assets still held (101) [5] (29) [5] 144 [5]
Trading securities [Member] | Other [Member]
     
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 117 143 152
Total gain (loss) (realized/unrealized) included in net income (loss) (5) (19) 1
Total gains or (losses) (realized/unrealized) included in other comprehensive income (loss) 0 [1] 0 [1] 0 [1]
Purchases 0 [2] 0 [2] 0 [2]
Sales 0 [2] 0 [2] 0 [2]
Issues 0 [3] 0 [3] 0 [3]
Settlements (13) [3] (7) [3] (6) [3]
Transfers out of Level 3 0 [4] 0 [4] (147) [4]
Transfers Into Level 3 0 [4] 0 [4] 143 [4]
Ending Balance 99 117 143
Net unrealized gains (losses) included in net income (loss) related to assets still held (5) [5] (19) [5] 0 [5]
Trading securities [Member] | Asset-Backed Securities [Member]
     
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance     12
Total gain (loss) (realized/unrealized) included in net income (loss)     0
Total gains or (losses) (realized/unrealized) included in other comprehensive income (loss)     0 [1]
Purchases     0 [2]
Sales     0 [2]
Issues     0 [3]
Settlements     (5) [3]
Transfers out of Level 3     (9) [4]
Transfers Into Level 3     2 [4]
Ending Balance     0
Net unrealized gains (losses) included in net income (loss) related to assets still held     0 [5]
Available-for-sale Securities [Member]
     
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 25,034 29,492 31,934
Total gain (loss) (realized/unrealized) included in net income (loss) 302 (192) (515)
Total gains or (losses) (realized/unrealized) included in other comprehensive income (loss) 1,665 [1] 1,892 [1] 467 [1]
Purchases 359 [2] 72 [2] 1,756 [2]
Sales (4,016) [2] (119) [2] (855) [2]
Issues 0 [3] 0 [3] 0 [3]
Settlements (4,642) [3] (5,109) [3] (3,904) [3]
Transfers out of Level 3 (3,373) [4] (4,220) [4] (2,707) [4]
Transfers Into Level 3 3,683 [4] 3,218 [4] 3,316 [4]
Ending Balance 19,012 25,034 29,492
Net unrealized gains (losses) included in net income (loss) related to assets still held 0 [5] 0 [5] 0 [5]
Available-for-sale Securities [Member] | Fannie Mae [Member]
     
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 29 946 114
Total gain (loss) (realized/unrealized) included in net income (loss) 0 0 0
Total gains or (losses) (realized/unrealized) included in other comprehensive income (loss) (1) [1] (8) [1] 44 [1]
Purchases 0 [2] 43 [2] 1,756 [2]
Sales 0 [2] (43) [2] (383) [2]
Issues 0 [3] 0 [3] 0 [3]
Settlements (7) [3] (24) [3] (22) [3]
Transfers out of Level 3 (14) [4] (895) [4] (1,023) [4]
Transfers Into Level 3 0 [4] 10 [4] 460 [4]
Ending Balance 7 29 946
Net unrealized gains (losses) included in net income (loss) related to assets still held 0 [5] 0 [5] 0 [5]
Available-for-sale Securities [Member] | Freddie Mac [Member]
     
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 10 12 3
Total gain (loss) (realized/unrealized) included in net income (loss) 0 0 0
Total gains or (losses) (realized/unrealized) included in other comprehensive income (loss) (1) [1] 0 [1] 0 [1]
Purchases 0 [2] 0 [2] 0 [2]
Sales 0 [2] 0 [2] 0 [2]
Issues 0 [3] 0 [3] 0 [3]
Settlements (2) [3] (2) [3] (1) [3]
Transfers out of Level 3 (1) [4] 0 [4] 0 [4]
Transfers Into Level 3 2 [4] 0 [4] 10 [4]
Ending Balance 8 10 12
Net unrealized gains (losses) included in net income (loss) related to assets still held 0 [5] 0 [5] 0 [5]
Available-for-sale Securities [Member] | Ginnie Mae [Member]
     
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 0    
Total gain (loss) (realized/unrealized) included in net income (loss) 0    
Total gains or (losses) (realized/unrealized) included in other comprehensive income (loss) 0 [1]    
Purchases 0 [2]    
Sales 0 [2]    
Issues 0 [3]    
Settlements 0 [3]    
Transfers out of Level 3 (1) [4]    
Transfers Into Level 3 1 [4]    
Ending Balance 0    
Net unrealized gains (losses) included in net income (loss) related to assets still held 0 [5]    
Available-for-sale Securities [Member] | Alt-A private-label securities [Member]
     
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 6,564 7,256 7,049
Total gain (loss) (realized/unrealized) included in net income (loss) 144 (87) (100)
Total gains or (losses) (realized/unrealized) included in other comprehensive income (loss) 464 [1] 584 [1] 119 [1]
Purchases 0 [2] 0 [2] 0 [2]
Sales (2,664) [2] 0 [2] 0 [2]
Issues 0 [3] 0 [3] 0 [3]
Settlements (1,040) [3] (1,072) [3] (974) [3]
Transfers out of Level 3 (3,357) [4] (3,325) [4] (1,684) [4]
Transfers Into Level 3 3,680 [4] 3,208 [4] 2,846 [4]
Ending Balance 3,791 6,564 7,256
Net unrealized gains (losses) included in net income (loss) related to assets still held 0 [5] 0 [5] 0 [5]
Available-for-sale Securities [Member] | Subprime private-label securities [Member]
     
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 7,447 7,586 9,932
Total gain (loss) (realized/unrealized) included in net income (loss) 120 (126) (386)
Total gains or (losses) (realized/unrealized) included in other comprehensive income (loss) 1,527 [1] 1,280 [1] (580) [1]
Purchases 359 [2] 0 [2] 0 [2]
Sales (1,317) [2] 0 [2] (363) [2]
Issues 0 [3] 0 [3] 0 [3]
Settlements (1,068) [3] (1,293) [3] (1,017) [3]
Transfers out of Level 3 0 [4] 0 [4] 0 [4]
Transfers Into Level 3 0 [4] 0 [4] 0 [4]
Ending Balance 7,068 7,447 7,586
Net unrealized gains (losses) included in net income (loss) related to assets still held 0 [5] 0 [5] 0 [5]
Available-for-sale Securities [Member] | Mortgage revenue bonds [Member]
     
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 7,837 10,247 11,030
Total gain (loss) (realized/unrealized) included in net income (loss) 25 9 (22)
Total gains or (losses) (realized/unrealized) included in other comprehensive income (loss) (449) [1] (23) [1] 834 [1]
Purchases 0 [2] 29 [2] 0 [2]
Sales (35) [2] (76) [2] (109) [2]
Issues 0 [3] 0 [3] 0 [3]
Settlements (2,125) [3] (2,349) [3] (1,486) [3]
Transfers out of Level 3 0 [4] 0 [4] 0 [4]
Transfers Into Level 3 0 [4] 0 [4] 0 [4]
Ending Balance 5,253 7,837 10,247
Net unrealized gains (losses) included in net income (loss) related to assets still held 0 [5] 0 [5] 0 [5]
Available-for-sale Securities [Member] | Other [Member]
     
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 3,147 3,445 3,806
Total gain (loss) (realized/unrealized) included in net income (loss) 13 12 (7)
Total gains or (losses) (realized/unrealized) included in other comprehensive income (loss) 125 [1] 59 [1] 50 [1]
Purchases 0 [2] 0 [2] 0 [2]
Sales 0 [2] 0 [2] 0 [2]
Issues 0 [3] 0 [3] 0 [3]
Settlements (400) [3] (369) [3] (404) [3]
Transfers out of Level 3 0 [4] 0 [4] 0 [4]
Transfers Into Level 3 0 [4] 0 [4] 0 [4]
Ending Balance 2,885 3,147 3,445
Net unrealized gains (losses) included in net income (loss) related to assets still held 0 [5] 0 [5] 0 [5]
Mortgage Loans [Member] | Consolidated Trusts [Member]
     
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 2,634 2,319 2,207
Total gain (loss) (realized/unrealized) included in net income (loss) 282 235 8
Total gains or (losses) (realized/unrealized) included in other comprehensive income (loss) 0 [1] 0 [1] 0 [1]
Purchases 346 [2] 935 [2] 184 [2]
Sales (393) [2] 0 [2] 0 [2]
Issues 0 [3] 0 [3] 0 [3]
Settlements (459) [3] (411) [3] (339) [3]
Transfers out of Level 3 (352) [4] (562) [4] (106) [4]
Transfers Into Level 3 646 [4] 118 [4] 365 [4]
Ending Balance 2,704 2,634 2,319
Net unrealized gains (losses) included in net income (loss) related to assets still held 50 [5] 159 [5] 9 [5]
Net derivatives [Member]
     
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 14 65 104
Total gain (loss) (realized/unrealized) included in net income (loss) (165) (23) 123
Total gains or (losses) (realized/unrealized) included in other comprehensive income (loss) 0 [1] 0 [1] 0 [1]
Purchases 0 [2] 0 [2] 0 [2]
Sales 0 [2] 0 [2] 0 [2]
Issues 0 [3] (8) [3] (4) [3]
Settlements 97 [3] (20) [3] (87) [3]
Transfers out of Level 3 16 [4] 0 [4] (71) [4]
Transfers Into Level 3 (2) [4] 0 [4] 0 [4]
Ending Balance (40) 14 65
Net unrealized gains (losses) included in net income (loss) related to assets still held (51) [5] (9) [5] 59 [5]
Long-term debt [Member]
     
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance (1,528) (1,171) (1,048)
Total gain (loss) (realized/unrealized) included in net income (loss) (174) (201) (123)
Total gain or (losses) included in other comprehensive income (loss) 0 [1] 0 [1] 0 [1]
Purchases 0 [2] 0 [2] 0 [2]
Sales 0 [2] 0 [2] 4 [2]
Issuances (695) [3] (523) [3] (70) [3]
Settlements 580 [3] 260 [3] 192 [3]
Transfers out of Level 3 434 [4] 474 [4] 185 [4]
Transfers Into Level 3 (90) [4] (367) [4] (311) [4]
Ending Balance (1,473) (1,528) (1,171)
Net unrealized gains (losses) included in net income (loss) related to assets still held (4) [5] (179) [5] (107) [5]
Long-term debt [Member] | Fannie Mae [Member] | Senior Floating [Member]
     
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance (400) (406) (421)
Total gain (loss) (realized/unrealized) included in net income (loss) 76 (21) (88)
Total gain or (losses) included in other comprehensive income (loss) 0 [1] 0 [1] 0 [1]
Purchases 0 [2] 0 [2] 0 [2]
Sales 0 [2] 0 [2] 0 [2]
Issuances (674) [3] 0 [3] 0 [3]
Settlements 43 [3] 27 [3] 103 [3]
Transfers out of Level 3 0 [4] 0 [4] 0 [4]
Transfers Into Level 3 0 [4] 0 [4] 0 [4]
Ending Balance (955) (400) (406)
Net unrealized gains (losses) included in net income (loss) related to assets still held 76 [5] (21) [5] (88) [5]
Long-term debt [Member] | Consolidated Trusts [Member]
     
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance (1,128) (765) (627)
Total gain (loss) (realized/unrealized) included in net income (loss) (250) (180) (35)
Total gain or (losses) included in other comprehensive income (loss) 0 [1] 0 [1] 0 [1]
Purchases 0 [2] 0 [2] 0 [2]
Sales 0 [2] 0 [2] 4 [2]
Issuances (21) [3] (523) [3] (70) [3]
Settlements 537 [3] 233 [3] 89 [3]
Transfers out of Level 3 434 [4] 474 [4] 185 [4]
Transfers Into Level 3 (90) [4] (367) [4] (311) [4]
Ending Balance (518) (1,128) (765)
Net unrealized gains (losses) included in net income (loss) related to assets still held $ (80) [5] $ (158) [5] $ (19) [5]
[1] Gains (losses) included in other comprehensive income (loss) are included in “Changes in unrealized gains on available-for-sale securities, net of reclassification adjustments and taxes” in the consolidated statements of operations and comprehensive income (loss).
[2] Purchases and sales include activity related to the consolidation and deconsolidation of assets of securitization trusts.
[3] Issues and settlements include activity related to the consolidation and deconsolidation of liabilities of securitization trusts.
[4] Transfers out of Level 3 consisted primarily of Fannie Mae MBS and private-label mortgage-related securities backed by Alt-A loans. Prices for these securities were obtained from multiple third-party vendors supported by market observable inputs. Transfers into Level 3 consisted primarily of private-label mortgage-related securities backed by Alt-A loans. Prices for these securities are based on inputs from a single source or inputs that were not readily observable.
[5] Amount represents temporary changes in fair value. Amortization, accretion and other-than-temporary impairments are not considered unrealized and are not included in this amount.