Expected Loss to be Paid - Net Expected Recoveries from Breaches of R&W Rollforward (Details) - RMBS [Member] - United States [Member] - USD ($) $ in Millions		Jun. 30, 2016	Dec. 31, 2015
Schedule of Expected Losses to be Paid [Line Items]
Future net R&W benefit	[1]	$ (58)	$ 79
First Lien [Member]
Schedule of Expected Losses to be Paid [Line Items]
Future net R&W benefit	[1]	(90)	0
Second Lien [Member]
Schedule of Expected Losses to be Paid [Line Items]
Future net R&W benefit	[1]	$ 32	$ 79

[1] The Company’s agreements with R&W providers generally provide that, as the Company makes claim payments, the R&W providers reimburse it for those claims; if the Company later receives reimbursement through the transaction (for example, from excess spread), the Company repays the R&W providers. See the section “Breaches of Representations and Warranties” for information about the R&W agreements and eligible assets held in trust with respect to such agreements. When the Company projects receiving more reimbursements in the future than it projects paying in claims on transactions covered by R&W settlement agreements, the Company will have a net R&W payable.