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Investments and Derivative Instruments Level 4 Repurchase Agreements, Dollar Roll Transactions and Other Collateral Transactions (Details) - USD ($) | Jun. 30, 2015 | Dec. 31, 2014
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Repurchase Agreements, Dollar Roll Transactions and Other Collateral Transactions [Line Items] |  |
Secured Debt, Repurchase Agreements |  | $ 0
Interest-bearing Deposit Liabilities, Domestic | $ 2,600,000,000 | 2,500,000,000
Secured Debt, Dollar Rolls | 0 | 0
US Treasury Securities [Member] |  |
Repurchase Agreements, Dollar Roll Transactions and Other Collateral Transactions [Line Items] |  |
Available-for-sale Securities Pledged as Collateral | 35,000,000 | $ 34,000,000
Fixed Maturities [Member] |  |
Repurchase Agreements, Dollar Roll Transactions and Other Collateral Transactions [Line Items] |  |
Available-for-sale Securities Pledged as Collateral | 315,000,000 |
Other Liabilities [Member] |  |
Repurchase Agreements, Dollar Roll Transactions and Other Collateral Transactions [Line Items] |  |
Assets Sold under Agreements to Repurchase, Repurchase Liability | $ 315,000,000 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount to be repaid to the counterparty to the repurchase agreement when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under the repurchase agreement exceeds 10 percent of total assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(i)(A)(ii)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition The fair value of available-for-sale securities that serve as collateral for borrowings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5086-111524 + Details
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- Definition Total amount of interest-bearing domestic deposit liabilities, which may include brokered, retail, demand, checking, notice of withdrawal, money market and other interest-bearing deposits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Carrying value, as of the balance sheet date, of an agreement to sell a mortgage-backed security with an agreement to purchase a similar mortgage-backed security at a future date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 10 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=51816387&loc=d3e101795-111710 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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- Definition Carrying value, as of the balance sheet date, of securities sold under agreements to repurchase where the transferor maintains effective control over the assets, accounting for them as secured debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 10 -Section 55 -Paragraph 51 -URI http://asc.fasb.org/extlink&oid=51816387&loc=d3e101761-111710 + Details
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