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Investments in Securities Other-than-temporary Impairments 1 (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Investments, Debt and Equity Securities [Abstract]        
Other-than-temporary-impairments $ 3 $ 5 $ 34 $ 187
Subprime private-label securities [Member]        
UPB and Modeled Attributes [Line Items]        
Unpaid principal balance $ 2,688   $ 2,688  
Weighted average collateral default 37.40%   37.40%  
Weighted average collateral severities 49.80%   49.80%  
Weighted average voluntary prepayment rates 2.90%   2.90%  
Average credit enhancement 12.80%   12.80%  
Alt-A Option ARM [Member]        
UPB and Modeled Attributes [Line Items]        
Unpaid principal balance $ 360   $ 360  
Weighted average collateral default 24.30%   24.30%  
Weighted average collateral severities 29.30%   29.30%  
Weighted average voluntary prepayment rates 9.30%   9.30%  
Average credit enhancement 3.70%   3.70%  
Alt-A Fixed Rate [Member]        
UPB and Modeled Attributes [Line Items]        
Unpaid principal balance $ 270   $ 270  
Weighted average collateral default 17.00%   17.00%  
Weighted average collateral severities 52.40%   52.40%  
Weighted average voluntary prepayment rates 7.90%   7.90%  
Average credit enhancement 0.40%   0.40%  
Alt-A Variable Rate [Member]        
UPB and Modeled Attributes [Line Items]        
Unpaid principal balance $ 548   $ 548  
Weighted average collateral default 18.80%   18.80%  
Weighted average collateral severities 38.20%   38.20%  
Weighted average voluntary prepayment rates 8.60%   8.60%  
Average credit enhancement 2.00%   2.00%  
Alt-A Hybrid Rate [Member]        
UPB and Modeled Attributes [Line Items]        
Unpaid principal balance $ 571   $ 571  
Weighted average collateral default 7.40%   7.40%  
Weighted average collateral severities 35.00%   35.00%  
Weighted average voluntary prepayment rates 13.90%   13.90%  
Average credit enhancement 1.60%   1.60%