Fair Value Measurements (Details 7) (Fair Value, Measurements, Recurring [Member], USD $) In Millions	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Realized and unrealized gains and losses related to assets and liabilities classified within Level Three included in Statements of Operations
Gain on mortgage loans, net, related to assets and liabilities still held on balance sheet	$ 43	$ 133	$ 35	$ 130
Change in fair value of Mortgage servicing rights, related to assets and liabilities still held on balance sheet	(130)	(273)	(102)	(262)
Other Income, related to assets and liabilities still held on balance sheet			(3)	1
Mortgage loans held for sale [Member]
Realized and unrealized gains and losses related to assets and liabilities classified within Level Three included in Statements of Operations
Gain on Mortgage Loans, Net	(1)	(5)	(16)	(10)
Mortgage interest income	3	2	6	5
Mortgage servicing rights [Member]
Realized and unrealized gains and losses related to assets and liabilities classified within Level Three included in Statements of Operations
Change in fair value of mortgage servicing rights	(159)	(320)	(191)	(372)
Interest rate lock commitments, net [Member]
Realized and unrealized gains and losses related to assets and liabilities classified within Level Three included in Statements of Operations
Gain on Mortgage Loans, Net	249	379	433	581
Securitized mortgage loans [Member]
Realized and unrealized gains and losses related to assets and liabilities classified within Level Three included in Statements of Operations
Mortgage interest income	1	2	2	3
Other income			(3)	1
Mortgage loan securitization debt certificates [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Mortgage interest expense	(1)	(2)	(2)	(3)
Other income		$ 1		$ 1

Fair value assets measured on recurring basis gain loss included in earnings assets and liabilities continued to be held gain loss on sale of mortgage loans.

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- Definition

Fair value, assets measured on recurring basis, gain loss included in earnings, assets and liabilities continued to be held, (MSR) impairment (recovery).

+ Details

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- Definition

Fair value assets measured on recurring basis gain loss included in earnings assets and liabilities continued to be held other income.

+ Details

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- Definition

Fair value assets measured on recurring basis gain loss included in gain loss on sale of mortgage loans.

+ Details

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- Definition

Fair Value Assets Measured On Recurring Basis Gain Loss Included In Mortgage Interest Income.

+ Details

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- Definition

Fair value assets measured on recurring basis gain loss included in mortgage servicing rights (MSR) impairment (recovery).

+ Details

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- Definition

Fair value liabilities measured on recurring basis gain loss included in mortgage interest expense.

+ Details

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- Definition

This item represents the amount of the total realized and unrealized gains or losses for the period which are included in the statement of income (or changes in net assets) in other income; the fair value of which assets was or is measured on a recurring basis using significant unobservable inputs (Level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 32
-Subparagraph c(1)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258

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This item represents the amount of the total realized and unrealized gains or losses for the period which are included in the statement of income (or changes in net assets) in other income; the fair value of which liabilities was or is measured on a recurring basis using significant unobservable inputs (Level 3).

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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