Derivatives (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Interest rate lock commitments | Gain on mortgage loans, net
Derivatives
Gains (losses) on derivative instruments	$ 74	$ 202
Forward delivery commitments | Gain on mortgage loans, net
Derivatives
Gains (losses) on derivative instruments	(20)	54
Option contracts | Gain on mortgage loans, net
Derivatives
Gains (losses) on derivative instruments	(1)	(2)
MSR-related agreements | Net derivative gain (loss) related to mortgage servicing rights
Derivatives
Gains (losses) on derivative instruments	$ 6	$ (16)