Expected Loss to be Paid - Future Net R&W Benefit (Details) - Residential Mortgage-Backed Securities (RMBS) [Member] - United States [Member] - USD ($) $ in Millions	Dec. 31, 2015	[1]	Dec. 31, 2014	Dec. 31, 2013
Schedule of Expected Losses to be Paid [Line Items]
Future net R&W benefits	$ 79		$ 317	$ 712
First Lien [Member]
Schedule of Expected Losses to be Paid [Line Items]
Future net R&W benefits	0		232	569
Second Lien [Member]
Schedule of Expected Losses to be Paid [Line Items]
Future net R&W benefits	$ 79		$ 85	$ 143

[1] See the section "Breaches of Representations and Warranties" below for eligible assets held in trust.