Investment Securities (Parenthetical) (Details) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Investment [Line Items]
Investment securities	$ 45,340	$ 43,938
OTTI previously recognized through OCI on securities held related to RMBS	358
OTTI previously recognized through OCI on securities held	472
OTTI previously recognized through OCI on securities held related to RMBS, gross unrealized losses	547
OTTI previously recognized through OCI on securities held, gross unrealized losses	615
Residential Mortgage Backed Securities [Member] \| Mortgage-backed Securities, Issued by Private Enterprises [Member]
Investment [Line Items]
Investment securities	1,031
Residential Mortgage Backed Securities [Member] \| Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Investment [Line Items]
Investment securities	$ 1,657

Other than temporary impairments previously recognized through other comprehensive income on securities still held.

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- Definition

Gross unrealized losses related to the other than temporary impairments previously recognized through other comprehensive income on securities still held.

+ Details

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- Definition

Other than temporary impairments previously recognized through other comprehensive income on securities still held related to residential mortgage backed securities.

+ Details

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- Definition

Gross unrealized losses on residential mortgage backed securities related to the other than temporary impairments previously recognized through other comprehensive income on securities still held.

+ Details

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- Definition

Line items represent reporting 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.

+ Details

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- Definition

Sum of the carrying amounts as of the balance sheet date of all investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 7
-Section 03
-Paragraph 1
-Subparagraph h

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(h))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

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