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Investments (Held to Maturity Securities Continuous Unrealized Loss Position) (Details) (USD $) In Millions | Sep. 30, 2011 | Dec. 31, 2010
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Less than 12 Months, Fair Value | $ 283 |
Less than 12 Months, Unrealized Losses | (31) |
12 Months or Longer, Fair Value | 2,872 | 3,760
12 Months or Longer, Unrealized Losses | (363) | (279)
Total, Fair Value | 3,155 | 3,760
Total, Unrealized Loss | (394) | (279)
Variable Interest Entity, Primary Beneficiary [Member] | Mortgage And Other Asset-Backed Securities [Member] |  |
Variable Interest Entity [Line Items] |  |
Less than 12 Months, Fair Value | 283 |
Less than 12 Months, Unrealized Losses | (31) |
12 Months or Longer, Fair Value | 2,872 | 3,760
12 Months or Longer, Unrealized Losses | (363) | (279)
Total, Fair Value | 3,155 | 3,760
Total, Unrealized Loss | $ (394) | $ (279)

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