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Investments (Narrative) (Details) (USD $) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2013 Securities | Sep. 30, 2012 | Dec. 31, 2012 Securities
Investments [Abstract] |  |  |
Proceeds from calls of United States Government sponsored agency securities and public and private bonds | $ 1,100,000,000 | $ 3,800,000,000 |
Proceeds from maturities, prepayments and calls of held for investment securities | 0 | 2,618,207,000 |
Fixed income securities with call features, percentage | 31.00% |  |
Fixed income securities with call features, callable during next 12 months, percentage | 5.00% |  |
Fixed income securities with call features, callable during next 12 months, amount | 1,300,000,000 |  |
United States Government agency securities, callable during next 12 months | 500,000,000 |  |
United States Government agency securities, callable during next 12 months, book yield | 3.75% |  |
Percentage of fixed maturity portfolio rated investment grade based on NAIC designations | 98.00% |  | 98.00%
Number of individual securities with unrealized losses | 885 |  | 198
Percentage of unrealized losses on fixed maturity securities where securities are rated investment grade | 94.00% |  | 75.00%
Investment Holdings [Line Items] |  |  |
Available for sale securities, amortized cost | 25,783,116,000 |  | 21,957,027,000
Proceeds from sales of available for sale securities | 1,200,000,000 | 276,100,000 |
Scheduled principal repayments, calls and tenders for available for sale securities | 2,955,734,000 | 1,942,533,000 |
Fixed Maturity Securities [Member] |  |  |
Investment Holdings [Line Items] |  |  |
Scheduled principal repayments, calls and tenders for available for sale securities | 1,900,000,000 | 1,600,000,000 |
Residential Mortgage Backed Securities [Member] | Residential Mortgage Backed Securities, Alt-A Sector [Member] |  |  |
Investment Holdings [Line Items] |  |  |
Available for sale securities, number of securities in unrealized loss positions | 36 |  |
Available for sale securities, amortized cost | 323,400,000 |  |
Available for sale securities, fair value | $ 340,700,000 |  |
Other Asset Backed Securities [Member] | Investments, External Credit Rating, Non Investment Grade [Member] |  |  |
Investment Holdings [Line Items] |  |  |
Available for sale securities, number of securities in unrealized loss positions | 0 |  |

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- Definition Represents the amount of debt securities in the investment portfolio with call features that permit the issuer of the debt to repay before the stated maturity date (early retirement date) and are callable during the next 12 months. + References No definition available. + Details
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- Definition The cash inflow associated with the calls (requests for early payments) of US Government Agency and Corporate (public and private) securities classified as available for sale or held for investment. + References No definition available. + Details
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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -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 Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 + Details
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- Definition The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Section 563c.102 -Chapter V -Subsection III -LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 16 -Subparagraph b -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 16 -Subparagraph a -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 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3179-108585 + Details
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