Derivatives (Details 3) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Derivatives
Net derivative gain (loss) related to mortgage servicing rights	$ 58	$ (49)	$ 143	$ 4
Interest rate lock commitments | Gain on loans held for sale, net
Derivatives
Gains (losses) on derivative instruments	101	54	178	135
Forward delivery commitments | Gain on loans held for sale, net
Derivatives
Gains (losses) on derivative instruments	(14)	28	(35)	11
Option contracts | Gain on loans held for sale, net
Derivatives
Gains (losses) on derivative instruments	(1)	(1)	(1)	(1)
MSR-related agreements | Net derivative gain related to mortgage servicing rights
Derivatives
Net derivative gain (loss) related to mortgage servicing rights	$ 58	$ (49)	$ 143	$ 4