Fair Values of Assets and Liabilities (Details 5) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Aggregate unpaid principal balance of MLHFS
Total Loans	$ 5,200
Carrying Amount [Member]
Aggregate unpaid principal balance of MLHFS
Total Loans	5,152	8,100
Nonaccrual loans	7	11
Loans 90 days or more past due	2	6
Aggregate Unpaid Principal [Member]
Aggregate unpaid principal balance of MLHFS
Total Loans	4,910	8,034
Nonaccrual loans	14	18
Loans 90 days or more past due	4	6
Excess of Carrying Amount Over (Under) Unpaid Principal [Member]
Aggregate unpaid principal balance of MLHFS
Total Loans	242	66
Nonaccrual loans	(7)	(7)
Loans 90 days or more past due	$ (2)

Differences between the aggregate fair value carrying amount of MLHFS and the aggregate unpaid principal amount.

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- Definition

This item represents the aggregate fair value of loans held as assets that are in nonaccrual status for which the fair value option has been elected, if the entity's policy is to recognize interest income separately from other changes in fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 159

-Paragraph 18

-Subparagraph e(2)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 825

-SubTopic 10

-Section 50

-Paragraph 28

-Subparagraph (e)(2)

-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

Recorded investment in financing receivables that are 90 days or more past due and still accruing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=6965416&loc=d3e5111-111524

-Subparagraph (d)

+ Details

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents mortgage loans held-for-sale as presented on the statement of financial position which are due the Company as of the balance sheet date.

+ Details

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Period Type:	instant