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Investments (Held to Maturity Securities Continuous Unrealized Loss Position) (Details) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Less than 12 Months, Fair Value
Less than 12 Months, Unrealized Losses
12 Months or Longer, Fair Value	3,383	3,760
12 Months or Longer, Unrealized Losses	(235)	(279)
Total, Fair Value	3,383	3,760
Total, Unrealized Loss	(235)	(279)
Variable Interest Entity, Primary Beneficiary [Member] | Mortgage And Other Asset-Backed Securities [Member]
Less than 12 Months, Fair Value
Less than 12 Months, Unrealized Losses
12 Months or Longer, Fair Value	3,383	3,760
12 Months or Longer, Unrealized Losses	(235)	(279)
Total, Fair Value	3,383	3,760
Total, Unrealized Loss	$ (235)	$ (279)

X

- 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 as held-to-maturity.

+ References

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X

- Definition

This item represents the excess of amortized cost basis over fair value of securities in a loss position and which are categorized as held-to-maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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This item represents the fair value of securities categorized as held-to-maturity which are in an unrealized loss position.

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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 less than twelve months for those securities which are categorized as held-to-maturity.

+ References

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