Variable Interest Entities (Unconsolidated Variable Interest Entities) (Details) - USD ($) $ in Millions		Sep. 30, 2015	Dec. 31, 2014
Variable Interest Entity [Line Items]
Financing Receivable, Net	[1]	$ 83,748	$ 122,457
Investment in Unconsolidated VIEs [Member]
Variable Interest Entity [Line Items]
Other assets and investment securities		601	632
Financing Receivable, Net		10	120
Total investment		611	752
Contractual obligations to fund new investments or guarantees		85	27
Total		$ 696	$ 779

[1] Amounts may not add due to rounding.