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Investments in Securities Other-than-temporary Impairments 2 (Details)
$ in Millions
Dec. 31, 2016
USD ($)
Subprime private-label securities [Member]  
UPB and Modeled Attributes [Line Items]  
Unpaid principal balance $ 2,026
Weighted average collateral default 36.80%
Weighted average collateral severities 45.80%
Weighted average voluntary prepayment rates 2.80%
Average credit enhancement 12.70%
Alt-A Option ARM [Member]  
UPB and Modeled Attributes [Line Items]  
Unpaid principal balance $ 317
Weighted average collateral default 25.30%
Weighted average collateral severities 25.70%
Weighted average voluntary prepayment rates 8.30%
Average credit enhancement 1.10%
Alt-A Fixed Rate [Member]  
UPB and Modeled Attributes [Line Items]  
Unpaid principal balance $ 214
Weighted average collateral default 16.50%
Weighted average collateral severities 59.20%
Weighted average voluntary prepayment rates 7.20%
Average credit enhancement 0.20%
Alt-A Variable Rate [Member]  
UPB and Modeled Attributes [Line Items]  
Unpaid principal balance $ 524
Weighted average collateral default 19.20%
Weighted average collateral severities 36.50%
Weighted average voluntary prepayment rates 8.30%
Average credit enhancement 2.10%
Alt-A Hybrid Rate [Member]  
UPB and Modeled Attributes [Line Items]  
Unpaid principal balance $ 530
Weighted average collateral default 7.10%
Weighted average collateral severities 33.50%
Weighted average voluntary prepayment rates 13.10%
Average credit enhancement 1.60%