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Fair Value Measurements Level 4 Fair Value Option (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Fair Value of Assets Accounted for Using Fair Value Option | $ 192,758 |  | $ 192,758 |  | $ 199,248
Fair Value, Option, Changes in Fair Value, Gain (Loss) | (4) | $ 9 | 0 | $ 21 |
Corporate Debt Securities [Member] |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) | (3) | 2 | (3) | 4 |
Collateralized Debt Obligations [Member] |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) | 0 | 6 | 1 | 14 |
Foreign Government Debt Securities [Member] |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) | (1) | 1 | (1) | 2 |
Residential Mortgage Backed Securities [Member] |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) | (1) | 0 | 0 | 1 |
Fixed Maturities [Member] |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) | (5) | 9 | (3) | 21 |
Equity Securities [Member] |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) | 1 | $ 0 | 3 | $ 0 |
Equity Securities [Member] |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Fair Value of Assets Accounted for Using Fair Value Option | 0 |  | 0 |  | 348
Fixed Maturities [Member] |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Fair Value of Assets Accounted for Using Fair Value Option | 553 |  | 553 |  | 488
Fixed Maturities [Member] | Asset-backed Securities [Member] |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Fair Value of Assets Accounted for Using Fair Value Option | 14 |  | 14 |  | 15
Fixed Maturities [Member] | Corporate Debt Securities [Member] |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Fair Value of Assets Accounted for Using Fair Value Option | 93 |  | 93 |  | 133
Fixed Maturities [Member] | Collateralized Debt Obligations [Member] |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Fair Value of Assets Accounted for Using Fair Value Option | 74 |  | 74 |  | 69
Fixed Maturities [Member] | Commercial Mortgage Backed Securities [Member] |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Fair Value of Assets Accounted for Using Fair Value Option | 23 |  | 23 |  | 22
Fixed Maturities [Member] | Foreign Government Debt Securities [Member] |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Fair Value of Assets Accounted for Using Fair Value Option | 36 |  | 36 |  | 30
Fixed Maturities [Member] | Residential Mortgage Backed Securities [Member] |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Fair Value of Assets Accounted for Using Fair Value Option | 305 |  | 305 |  | 215
Fixed Maturities [Member] | US Treasury Bond Securities [Member] |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Fair Value of Assets Accounted for Using Fair Value Option | 6 |  | 6 |  | 2
Fixed Maturities [Member] | Municipal Bonds [Member] |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Fair Value of Assets Accounted for Using Fair Value Option | $ 2 |  | $ 2 |  | $ 2

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 + Details
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