Fair Value Measurements (Details 7) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Level Two
Debt
Fair value of debt	$ 1,400		$ 1,400		$ 1,300
Level Two | Market based approach
Debt
Fair value of debt	569		569
Level Two | Observable spreads and terms for recent pricing of similar instruments
Debt
Fair value of debt	865		865
Gain on loans held for sale, net
Unrealized gains (losses) related to assets and liabilities included in Condensed Consolidated Balance Sheets
Unrealized Gain or Loss for Level 3 Fair Value instruments	35	$ 18	35	$ 18
Change in fair value of MSRs
Unrealized gains (losses) related to assets and liabilities included in Condensed Consolidated Balance Sheets
Unrealized Gain or Loss for Level 3 Fair Value instruments	$ (70)	$ 69	$ (165)	$ 81