Securities - Gross Unrealized Losses (Details 5) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2011	Dec. 31, 2010
Gross unrealized losses
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	$ 2,522	$ 2,522	$ 2,025
Available-for-sale Securities, with gross unrealized losses, 12 Months or Longer, Gross unrealized losses	1,254	1,254	510
External Credit Rating, Non Investment Grade [Member] \| Prime and Alt-A [Member]
Gross unrealized losses
Available-for-Sale Securities, By Amortized Cost, Rated Below Investment Grade, Percentage of Portfolio	55.00%	55.00%
Available-For-Sale Securities, Qualitative Disclosure, Percentage Other-than-temporarily Impaired	65.00%	65.00%
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Credit Enhancement Percentage	8.00%	8.00%
External Credit Rating, Investment Grade [Member] \| Prime and Alt-A [Member]
Gross unrealized losses
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Credit Enhancement Percentage	49.00%	49.00%
Minimum [Member] \| Non-U.S. [Member]
Gross unrealized losses
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Other, Default Rate	0.25%
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Constant Prepayment Rate	15.00%
Maximum [Member] \| Non-U.S. [Member]
Gross unrealized losses
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Other, Default Rate	0.50%
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Constant Prepayment Rate	20.00%
Prime and Alt-A [Member]
Gross unrealized losses
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	176	176	250
Available-for-sale Securities, with gross unrealized losses, 12 Months or Longer, Gross unrealized losses	174	174	250
Other-than-temporary impairment losses	15	58
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Other, Default Rate		23.00%
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Other, Loss Severity Rate		50.00%
Non-U.S. [Member]
Gross unrealized losses
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	530	530	409
Available-for-sale Securities, with gross unrealized losses, 12 Months or Longer, Gross unrealized losses	374	374	30
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Other, Recovery Rate	60.00%
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Credit Enhancement Percentage	10.00%	10.00%
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Expected Lifetime Losses	1.50%	1.50%
Corporate Debt Securities [Member]
Gross unrealized losses
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	1,462	1,462	419
Available-for-sale Securities, with gross unrealized losses, 12 Months or Longer, Gross unrealized losses	575	575	1
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Other, Percentage Range of Fair Value to Amortized Cost	5.00%	5.00%
Collateralized Loan Obligations [Member]
Gross unrealized losses
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	164	164	210
Available-for-sale Securities, with gross unrealized losses, 12 Months or Longer, Gross unrealized losses	$ 106	$ 106	$ 200
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Other, Default Rate		2.00%
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Other, Loss Severity Rate	48.00%
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Other, Loss Severity From Debt Securities	82.00%	82.00%
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Credit Enhancement Percentage	30.00%	30.00%
Collateral default rates after the current period	4.00%	4.00%
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Months Between Default and Loss		18 months

The percentage of available-for-Sale securities, by amortized cost, that are rated below investment grade.

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- Definition

This item represents the constant prepayment rate of the underlying assets in the security that were considered as one of the potential factors in reaching a conclusion that the available-for-sale investments are not other-than-temporarily impaired.

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- Definition

This item represents the percentage of available-for-sale securities with a credit enhancement against the loss of value in the underlying assets in the security which were considered and relied upon as one of the potential factors in reaching a conclusion that the available-for-sale investments are not other-than-temporarily impaired.

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- Definition

The expected lifetime rate at which principal will not be repaid on available-for-sale securities. This is used as a key input and assumption in measuring the potential credit losses of available-for-sale securities as of the date of the latest statement of financial position presented.

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- Definition

This item represents the number of months after default that losses on collateral are expected to occur, which was considered as one of the potential factors in reaching a conclusion that the available-for-sale investments are not other-than-temporarily impaired.

+ Details

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- Definition

This item represents the loss severity from debt securities of the underlying assets in the security, represented as a percentage, which was considered as one of the potential factors in reaching a conclusion that the available-for-sale investments are not other-than-temporarily impaired.

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- Definition

This item represents the percentage range that fair value is within amortized cost for the security that was considered as one of the potential factors in reaching a conclusion that the available-for-sale investments are not other-than-temporarily impaired.

+ Details

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- Definition

This item represents the default rate projected for future periods on the underlying assets in the security that were considered as one of the potential factors in reaching a conclusion that the available-for-sale investments are not other-than-temporarily impaired.

+ Details

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- Definition

This item represents the recovery rate of the underlying assets in the security that were considered as one of the potential factors in reaching a conclusion that the available-for-sale investments are not other-than-temporarily impaired.

+ Details

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- Definition

This item contains disclosure of the percentage of investment positions in the available-for-sale investments determined to have been other-than-temporarily impaired.

+ Details

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- Definition

This item represents the excess of amortized cost basis over fair value of securities that have been in a loss position for twelve months or longer for those securities which are categorized neither as held-to-maturity nor trading securities.

+ Details

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- Definition

This item represents the excess of amortized cost basis over fair value of securities in a loss position and which are categorized neither as held-to-maturity nor trading securities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 6

-Subparagraph (a)(2)

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-Publisher FASB

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-Paragraph 21

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-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 3: http://www.xbrl.org/2003/role/presentationRef

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-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.

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- Definition

This item represents the default rate of the underlying assets in the security that were considered as one of the potential factors in reaching a conclusion that the available-for-sale investments are not other-than-temporarily impaired.

+ References

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

-Publisher FASB

-Name FASB Staff Position (FSP)

-Number FAS115-1/124-1

-Paragraph 17

-Subparagraph b

-Clause 5

-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.

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- Definition

This item represents the loan to collateral ratio of the underlying assets in the security, represented as a percentage, which was considered as one of the potential factors in reaching a conclusion that the available-for-sale investments are not other-than-temporarily impaired.

+ References

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- Definition

The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

+ References

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

-Publisher FASB

-Name FASB Staff Position (FSP)

-Number FAS115-1/124-1

-Paragraph 15C

-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 FASB Staff Position (FSP)

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-Paragraph 15D

-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 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Staff Position (FSP)

-Number FAS115-1/124-1

-Paragraph 22

-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.

+ Details

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