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Investments (Held To Maturity Securities Continuous Unrealized Loss Position) (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Less than 12 Months, Fair Value | $ 303 | $ 284
Less than 12 Months, Unrealized Losses | (12) | (31)
12 Months or Longer, Fair Value | 2,315 | 2,185
12 Months or Longer, Unrealized Losses | (210) | (340)
Total, Fair Value | 2,618 | 2,469
Total, Unrealized Loss | (222) | (371)
Variable Interest Entity [Member] | Mortgage And Other Asset-Backed Securities [Member] |  |
Variable Interest Entity [Line Items] |  |
Less than 12 Months, Fair Value | 303 | 284
Less than 12 Months, Unrealized Losses | (12) | (31)
12 Months or Longer, Fair Value | 2,315 | 2,185
12 Months or Longer, Unrealized Losses | (210) | (340)
Total, Fair Value | 2,618 | 2,469
Total, Unrealized Loss | $ (222) | $ (371)

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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 as held-to-maturity. + 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) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a -Clause 2 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph a -Clause 2 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. + Details
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