Summary of Significant Accounting Policies Fee and Other Income (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Gain Contingencies [Line Items]
Fee and other income	$ 259,000,000	$ 826,000,000	$ 1,123,000,000	$ 5,564,000,000
Private Label Securities Settlements [Member]
Gain Contingencies [Line Items]
Fee and other income	$ 0	$ 538,000,000	$ 0	$ 4,800,000,000