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Investments in Securities Other-than-temporary Impairments 4 (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Subprime private-label securities [Member]
 
UPB and Modeled Attributes [Line Items]  
Unpaid principal balance $ 10,403
Weighted average collateral default (percent) 55.40% [1]
Weighted average collateral severities (percent) 61.70% [2]
Weighted average voluntary prepayment rates (percent) 2.40% [3]
Average credit enhancement (percent) 12.40% [4]
Alt-A Option ARM [Member]
 
UPB and Modeled Attributes [Line Items]  
Unpaid principal balance 1,851
Weighted average collateral default (percent) 39.80% [1]
Weighted average collateral severities (percent) 52.40% [2]
Weighted average voluntary prepayment rates (percent) 6.30% [3]
Average credit enhancement (percent) 6.20% [4]
Alt-A Fixed Rate [Member]
 
UPB and Modeled Attributes [Line Items]  
Unpaid principal balance 2,293
Weighted average collateral default (percent) 19.30% [1]
Weighted average collateral severities (percent) 54.00% [2]
Weighted average voluntary prepayment rates (percent) 9.70% [3]
Average credit enhancement (percent) 5.20% [4]
Alt-A Variable Rate [Member]
 
UPB and Modeled Attributes [Line Items]  
Unpaid principal balance 1,725
Weighted average collateral default (percent) 37.90% [1]
Weighted average collateral severities (percent) 48.10% [2]
Weighted average voluntary prepayment rates (percent) 7.20% [3]
Average credit enhancement (percent) 5.40% [4]
Alt-A Hybrid Rate [Member]
 
UPB and Modeled Attributes [Line Items]  
Unpaid principal balance 3,320
Weighted average collateral default (percent) 23.60% [1]
Weighted average collateral severities (percent) 43.40% [2]
Weighted average voluntary prepayment rates (percent) 8.60% [3]
Average credit enhancement (percent) 2.90% [4]
2004 and Prior [Member] | Subprime private-label securities [Member]
 
UPB and Modeled Attributes [Line Items]  
Unpaid principal balance 442
Weighted average collateral default (percent) 31.00% [1]
Weighted average collateral severities (percent) 55.40% [2]
Weighted average voluntary prepayment rates (percent) 7.00% [3]
Average credit enhancement (percent) 46.80% [4]
2004 and Prior [Member] | Alt-A Option ARM [Member]
 
UPB and Modeled Attributes [Line Items]  
Unpaid principal balance 209
Weighted average collateral default (percent) 24.80% [1]
Weighted average collateral severities (percent) 52.10% [2]
Weighted average voluntary prepayment rates (percent) 8.10% [3]
Average credit enhancement (percent) 4.90% [4]
2004 and Prior [Member] | Alt-A Fixed Rate [Member]
 
UPB and Modeled Attributes [Line Items]  
Unpaid principal balance 999
Weighted average collateral default (percent) 11.00% [1]
Weighted average collateral severities (percent) 50.90% [2]
Weighted average voluntary prepayment rates (percent) 11.10% [3]
Average credit enhancement (percent) 11.30% [4]
2004 and Prior [Member] | Alt-A Variable Rate [Member]
 
UPB and Modeled Attributes [Line Items]  
Unpaid principal balance 170
Weighted average collateral default (percent) 21.00% [1]
Weighted average collateral severities (percent) 40.50% [2]
Weighted average voluntary prepayment rates (percent) 8.20% [3]
Average credit enhancement (percent) 20.80% [4]
2004 and Prior [Member] | Alt-A Hybrid Rate [Member]
 
UPB and Modeled Attributes [Line Items]  
Unpaid principal balance 569
Weighted average collateral default (percent) 15.30% [1]
Weighted average collateral severities (percent) 36.40% [2]
Weighted average voluntary prepayment rates (percent) 8.50% [3]
Average credit enhancement (percent) 6.60% [4]
2005 [Member] | Subprime private-label securities [Member]
 
UPB and Modeled Attributes [Line Items]  
Unpaid principal balance 47
Weighted average collateral default (percent) 52.80% [1]
Weighted average collateral severities (percent) 60.90% [2]
Weighted average voluntary prepayment rates (percent) 2.70% [3]
Average credit enhancement (percent) 48.50% [4]
2005 [Member] | Alt-A Option ARM [Member]
 
UPB and Modeled Attributes [Line Items]  
Unpaid principal balance 811
Weighted average collateral default (percent) 36.90% [1]
Weighted average collateral severities (percent) 55.70% [2]
Weighted average voluntary prepayment rates (percent) 6.90% [3]
Average credit enhancement (percent) 8.00% [4]
2005 [Member] | Alt-A Fixed Rate [Member]
 
UPB and Modeled Attributes [Line Items]  
Unpaid principal balance 880
Weighted average collateral default (percent) 25.10% [1]
Weighted average collateral severities (percent) 54.40% [2]
Weighted average voluntary prepayment rates (percent) 9.10% [3]
Average credit enhancement (percent) 0.70% [4]
2005 [Member] | Alt-A Variable Rate [Member]
 
UPB and Modeled Attributes [Line Items]  
Unpaid principal balance 415
Weighted average collateral default (percent) 36.80% [1]
Weighted average collateral severities (percent) 47.40% [2]
Weighted average voluntary prepayment rates (percent) 7.60% [3]
Average credit enhancement (percent) 12.30% [4]
2005 [Member] | Alt-A Hybrid Rate [Member]
 
UPB and Modeled Attributes [Line Items]  
Unpaid principal balance 1,412
Weighted average collateral default (percent) 29.50% [1]
Weighted average collateral severities (percent) 44.70% [2]
Weighted average voluntary prepayment rates (percent) 8.30% [3]
Average credit enhancement (percent) 2.90% [4]
2006 [Member] | Subprime private-label securities [Member]
 
UPB and Modeled Attributes [Line Items]  
Unpaid principal balance 9,439
Weighted average collateral default (percent) 56.70% [1]
Weighted average collateral severities (percent) 62.80% [2]
Weighted average voluntary prepayment rates (percent) 2.30% [3]
Average credit enhancement (percent) 10.10% [4]
2006 [Member] | Alt-A Option ARM [Member]
 
UPB and Modeled Attributes [Line Items]  
Unpaid principal balance 831
Weighted average collateral default (percent) 46.50% [1]
Weighted average collateral severities (percent) 49.90% [2]
Weighted average voluntary prepayment rates (percent) 5.30% [3]
Average credit enhancement (percent) 4.70% [4]
2006 [Member] | Alt-A Fixed Rate [Member]
 
UPB and Modeled Attributes [Line Items]  
Unpaid principal balance 414
Weighted average collateral default (percent) 27.00% [1]
Weighted average collateral severities (percent) 56.20% [2]
Weighted average voluntary prepayment rates (percent) 7.50% [3]
Average credit enhancement (percent) 0.10% [4]
2006 [Member] | Alt-A Variable Rate [Member]
 
UPB and Modeled Attributes [Line Items]  
Unpaid principal balance 1,140
Weighted average collateral default (percent) 40.80% [1]
Weighted average collateral severities (percent) 48.80% [2]
Weighted average voluntary prepayment rates (percent) 7.00% [3]
Average credit enhancement (percent) 0.60% [4]
2006 [Member] | Alt-A Hybrid Rate [Member]
 
UPB and Modeled Attributes [Line Items]  
Unpaid principal balance 1,251
Weighted average collateral default (percent) 20.60% [1]
Weighted average collateral severities (percent) 43.70% [2]
Weighted average voluntary prepayment rates (percent) 9.00% [3]
Average credit enhancement (percent) 0.00% [4]
2007 and After [Member] | Subprime private-label securities [Member]
 
UPB and Modeled Attributes [Line Items]  
Unpaid principal balance 475
Weighted average collateral default (percent) 52.40% [1]
Weighted average collateral severities (percent) 40.80% [2]
Weighted average voluntary prepayment rates (percent) 1.60% [3]
Average credit enhancement (percent) 23.30% [4]
2007 and After [Member] | Alt-A Option ARM [Member]
 
UPB and Modeled Attributes [Line Items]  
Unpaid principal balance 0
2007 and After [Member] | Alt-A Fixed Rate [Member]
 
UPB and Modeled Attributes [Line Items]  
Unpaid principal balance 0
2007 and After [Member] | Alt-A Variable Rate [Member]
 
UPB and Modeled Attributes [Line Items]  
Unpaid principal balance 0
2007 and After [Member] | Alt-A Hybrid Rate [Member]
 
UPB and Modeled Attributes [Line Items]  
Unpaid principal balance $ 88
Weighted average collateral default (percent) 24.30% [1]
Weighted average collateral severities (percent) 43.50% [2]
Weighted average voluntary prepayment rates (percent) 7.60% [3]
Average credit enhancement (percent) 20.50% [4]
[1] The expected remaining cumulative default rate of the collateral pool backing the securities, as a percentage of the current collateral unpaid principal balance, weighted by security unpaid principal balance.
[2] The expected remaining loss given default of the collateral pool backing the securities, calculated as the ratio of remaining cumulative loss divided by cumulative defaults, weighted by security unpaid principal balance.
[3] The average monthly voluntary prepayment rate, weighted by security unpaid principal balance.
[4] The average percent current credit enhancement provided by subordination of other securities. Excludes excess interest projections and monoline bond insurance.