Fair Value Measurements (Fair Value of Financial Instruments) (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Carrying and Fair Values of Financial Instruments [Abstract]
Investment securities available-for-sale	$ 2,272	$ 1,672
Loans held-for-sale	2,005	1,196
Loans held-for-investment	182	211
Mortgage servicing rights	317	258
Derivative assets	10	15
Long-term debt	(36)	(84)
Derivative liabilities	(7)
Level 1 | U.S. Treasury and euro dollar futures
Carrying and Fair Values of Financial Instruments [Abstract]
Derivative assets	1
Carrying Value
Carrying and Fair Values of Financial Instruments [Abstract]
Cash and cash equivalents	246	136
Other investments	100	100
Investment securities available-for-sale	2,272	1,672
Loans held-for-sale	2,038	1,244
Loans with government guarantees	592	1,128
Loans held-for-investment	5,113	4,151
Repossessed assets	18	19
Federal Home Loan Bank stock	113	155
Mortgage servicing rights	317	258
Bank owned life insurance	150
Other assets, foreclosure claims	267
Federal Home Loan Bank advances	(2,198)	(514)
Long-term debt	(283)	(331)
Warrant liabilities	(7)	(6)
Litigation settlement	(84)	(82)
Derivative liabilities	(6)
Carrying Value | Demand deposits and savings accounts
Carrying and Fair Values of Financial Instruments [Abstract]
Deposits	(4,986)	(4,565)
Carrying Value | Certificates of deposit
Carrying and Fair Values of Financial Instruments [Abstract]
Deposits	(767)	(813)
Carrying Value | Government deposits
Carrying and Fair Values of Financial Instruments [Abstract]
Deposits	(970)	(918)
Carrying Value | Company controlled deposits
Carrying and Fair Values of Financial Instruments [Abstract]
Deposits	(925)	(773)
Carrying Value | U.S. Treasury and euro dollar futures
Carrying and Fair Values of Financial Instruments [Abstract]
Derivative assets	1
Carrying Value | Rate lock commitments
Carrying and Fair Values of Financial Instruments [Abstract]
Derivative assets		31
Derivative liabilities	(3)
Carrying Value | Swap futures
Carrying and Fair Values of Financial Instruments [Abstract]
Derivative assets	2
Carrying Value | Forward agency and loan sales
Carrying and Fair Values of Financial Instruments [Abstract]
Derivative assets	14
Derivative liabilities	(7)	(13)
Carrying Value | Mortgage backed securities forwards
Carrying and Fair Values of Financial Instruments [Abstract]
Derivative liabilities	(1)
Carrying Value | Interest rate swaps
Carrying and Fair Values of Financial Instruments [Abstract]
Derivative assets		6
Derivative liabilities		(6)
Carrying Value | Agency forwards
Carrying and Fair Values of Financial Instruments [Abstract]
Derivative assets		2
Carrying Value | U.S. Treasury and euro dollar futures
Carrying and Fair Values of Financial Instruments [Abstract]
Derivative assets		7
Derivative liabilities		(1)
Estimated Fair Value
Carrying and Fair Values of Financial Instruments [Abstract]
Cash and cash equivalents	246	136
Other investments	100	100
Investment securities available-for-sale	2,272	1,672
Loans held-for-sale	2,053	1,196
Loans with government guarantees	573	1,094
Loans held-for-investment	5,033	3,998
Repossessed assets	18	19
Federal Home Loan Bank stock	113	155
Mortgage servicing rights	317	258
Bank owned life insurance	150
Other assets, foreclosure claims	267
Federal Home Loan Bank advances	(2,191)	(514)
Long-term debt	(127)	(172)
Warrant liabilities	(7)	(6)
Litigation settlement	(84)	(82)
Derivative liabilities	(6)
Estimated Fair Value | Demand deposits and savings accounts
Carrying and Fair Values of Financial Instruments [Abstract]
Deposits	(4,732)	(4,291)
Estimated Fair Value | Certificates of deposit
Carrying and Fair Values of Financial Instruments [Abstract]
Deposits	(770)	(816)
Estimated Fair Value | Government deposits
Carrying and Fair Values of Financial Instruments [Abstract]
Deposits	(953)	(884)
Estimated Fair Value | Company controlled deposits
Carrying and Fair Values of Financial Instruments [Abstract]
Deposits	(883)	(770)
Estimated Fair Value | U.S. Treasury and euro dollar futures
Carrying and Fair Values of Financial Instruments [Abstract]
Derivative assets	1
Estimated Fair Value | Rate lock commitments
Carrying and Fair Values of Financial Instruments [Abstract]
Derivative assets	33	31
Derivative liabilities	(3)
Estimated Fair Value | Swap futures
Carrying and Fair Values of Financial Instruments [Abstract]
Derivative assets	2
Estimated Fair Value | Forward agency and loan sales
Carrying and Fair Values of Financial Instruments [Abstract]
Derivative assets	14
Derivative liabilities	(7)	(13)
Estimated Fair Value | Mortgage backed securities forwards
Carrying and Fair Values of Financial Instruments [Abstract]
Derivative liabilities	(1)
Estimated Fair Value | Interest rate swaps
Carrying and Fair Values of Financial Instruments [Abstract]
Derivative assets	6	6
Derivative liabilities		(6)
Estimated Fair Value | Agency forwards
Carrying and Fair Values of Financial Instruments [Abstract]
Derivative assets		2
Estimated Fair Value | U.S. Treasury and euro dollar futures
Carrying and Fair Values of Financial Instruments [Abstract]
Derivative assets		7
Derivative liabilities		(1)
Estimated Fair Value | Level 1
Carrying and Fair Values of Financial Instruments [Abstract]
Cash and cash equivalents	246	136
Other investments		0
Investment securities available-for-sale	0	0
Loans held-for-sale	0	0
Loans with government guarantees	0	0
Loans held-for-investment	0	0
Repossessed assets	0	0
Federal Home Loan Bank stock	0	155
Mortgage servicing rights	0	0
Bank owned life insurance	0
Other assets, foreclosure claims	0
Federal Home Loan Bank advances	0	(514)
Long-term debt	0	0
Warrant liabilities	0	0
Litigation settlement	0	0
Derivative liabilities	0
Estimated Fair Value | Level 1 | Demand deposits and savings accounts
Carrying and Fair Values of Financial Instruments [Abstract]
Deposits	0	0
Estimated Fair Value | Level 1 | Certificates of deposit
Carrying and Fair Values of Financial Instruments [Abstract]
Deposits	0	0
Estimated Fair Value | Level 1 | Government deposits
Carrying and Fair Values of Financial Instruments [Abstract]
Deposits	0	0
Estimated Fair Value | Level 1 | Company controlled deposits
Carrying and Fair Values of Financial Instruments [Abstract]
Deposits	0	0
Estimated Fair Value | Level 1 | Rate lock commitments
Carrying and Fair Values of Financial Instruments [Abstract]
Derivative assets	0	0
Derivative liabilities	0
Estimated Fair Value | Level 1 | Swap futures
Carrying and Fair Values of Financial Instruments [Abstract]
Derivative assets	0
Estimated Fair Value | Level 1 | Forward agency and loan sales
Carrying and Fair Values of Financial Instruments [Abstract]
Derivative assets	0
Derivative liabilities	0	0
Estimated Fair Value | Level 1 | Mortgage backed securities forwards
Carrying and Fair Values of Financial Instruments [Abstract]
Derivative liabilities	(1)
Estimated Fair Value | Level 1 | Interest rate swaps
Carrying and Fair Values of Financial Instruments [Abstract]
Derivative assets	0	0
Derivative liabilities		0
Estimated Fair Value | Level 1 | Agency forwards
Carrying and Fair Values of Financial Instruments [Abstract]
Derivative assets		2
Estimated Fair Value | Level 1 | U.S. Treasury and euro dollar futures
Carrying and Fair Values of Financial Instruments [Abstract]
Derivative assets		7
Derivative liabilities		(1)
Estimated Fair Value | Level 2
Carrying and Fair Values of Financial Instruments [Abstract]
Cash and cash equivalents	0	0
Other investments	0	0
Investment securities available-for-sale	2,272	1,670
Loans held-for-sale	2,053	1,196
Loans with government guarantees	573	1,094
Loans held-for-investment		26
Repossessed assets	0	0
Federal Home Loan Bank stock	113	0
Mortgage servicing rights	0	0
Bank owned life insurance	150
Other assets, foreclosure claims	267
Federal Home Loan Bank advances	(2,191)	0
Long-term debt	(91)	(88)
Warrant liabilities	(7)	(6)
Litigation settlement	0	0
Derivative liabilities	(6)
Estimated Fair Value | Level 2 | Demand deposits and savings accounts
Carrying and Fair Values of Financial Instruments [Abstract]
Deposits	(4,732)	(4,291)
Estimated Fair Value | Level 2 | Certificates of deposit
Carrying and Fair Values of Financial Instruments [Abstract]
Deposits	(770)	(816)
Estimated Fair Value | Level 2 | Government deposits
Carrying and Fair Values of Financial Instruments [Abstract]
Deposits	(953)	(884)
Estimated Fair Value | Level 2 | Company controlled deposits
Carrying and Fair Values of Financial Instruments [Abstract]
Deposits	(883)	(770)
Estimated Fair Value | Level 2 | U.S. Treasury and euro dollar futures
Carrying and Fair Values of Financial Instruments [Abstract]
Derivative assets	0
Estimated Fair Value | Level 2 | Rate lock commitments
Carrying and Fair Values of Financial Instruments [Abstract]
Derivative assets	0	0
Derivative liabilities	0
Estimated Fair Value | Level 2 | Swap futures
Carrying and Fair Values of Financial Instruments [Abstract]
Derivative assets	2
Estimated Fair Value | Level 2 | Forward agency and loan sales
Carrying and Fair Values of Financial Instruments [Abstract]
Derivative assets	14
Derivative liabilities	(7)	(13)
Estimated Fair Value | Level 2 | Mortgage backed securities forwards
Carrying and Fair Values of Financial Instruments [Abstract]
Derivative liabilities	0
Estimated Fair Value | Level 2 | Interest rate swaps
Carrying and Fair Values of Financial Instruments [Abstract]
Derivative assets		6
Derivative liabilities		(6)
Estimated Fair Value | Level 2 | Agency forwards
Carrying and Fair Values of Financial Instruments [Abstract]
Derivative assets		0
Estimated Fair Value | Level 2 | U.S. Treasury and euro dollar futures
Carrying and Fair Values of Financial Instruments [Abstract]
Derivative assets		0
Derivative liabilities		0
Estimated Fair Value | Level 3
Carrying and Fair Values of Financial Instruments [Abstract]
Cash and cash equivalents	0	0
Other investments	100	100
Investment securities available-for-sale	0	2
Loans held-for-sale	0	0
Loans with government guarantees	0	0
Loans held-for-investment	4,992	3,972
Repossessed assets	18	19
Federal Home Loan Bank stock	0	0
Mortgage servicing rights	317	258
Bank owned life insurance	0
Other assets, foreclosure claims	0
Federal Home Loan Bank advances	0	0
Long-term debt	(36)	(84)
Warrant liabilities	0	0
Litigation settlement	(84)	(82)
Derivative liabilities	0
Estimated Fair Value | Level 3 | Demand deposits and savings accounts
Carrying and Fair Values of Financial Instruments [Abstract]
Deposits	0	0
Estimated Fair Value | Level 3 | Certificates of deposit
Carrying and Fair Values of Financial Instruments [Abstract]
Deposits	0	0
Estimated Fair Value | Level 3 | Government deposits
Carrying and Fair Values of Financial Instruments [Abstract]
Deposits	0	0
Estimated Fair Value | Level 3 | Company controlled deposits
Carrying and Fair Values of Financial Instruments [Abstract]
Deposits	0	0
Estimated Fair Value | Level 3 | U.S. Treasury and euro dollar futures
Carrying and Fair Values of Financial Instruments [Abstract]
Derivative assets	0
Estimated Fair Value | Level 3 | Rate lock commitments
Carrying and Fair Values of Financial Instruments [Abstract]
Derivative assets		31
Derivative liabilities	(3)
Estimated Fair Value | Level 3 | Swap futures
Carrying and Fair Values of Financial Instruments [Abstract]
Derivative assets	0
Estimated Fair Value | Level 3 | Forward agency and loan sales
Carrying and Fair Values of Financial Instruments [Abstract]
Derivative assets	0
Derivative liabilities	0	0
Estimated Fair Value | Level 3 | Mortgage backed securities forwards
Carrying and Fair Values of Financial Instruments [Abstract]
Derivative liabilities	0
Estimated Fair Value | Level 3 | Interest rate swaps
Carrying and Fair Values of Financial Instruments [Abstract]
Derivative assets	$ 0	0
Derivative liabilities		0
Estimated Fair Value | Level 3 | Agency forwards
Carrying and Fair Values of Financial Instruments [Abstract]
Derivative assets		0
Estimated Fair Value | Level 3 | U.S. Treasury and euro dollar futures
Carrying and Fair Values of Financial Instruments [Abstract]
Derivative assets		0
Derivative liabilities		$ 0