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Fair Value Measurements Level 4 Fair Value Option (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Available-for-sale Securities, Equity Securities | $ 875 |  | $ 875 |  | $ 1,121
Available-for-sale Equity Securities, Amortized Cost Basis | 812 |  | 812 |  | 1,135
Fair Value of Assets Accounted for Using Fair Value Option | 180,260 |  | 180,260 |  | 181,633
Fair Value, Option, Changes in Fair Value, Gain (Loss) | 4 | $ (4) | (26) | $ (4) |
Corporate Debt Securities [Member] |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) | 1 | (2) | 1 | (5) |
Collateralized Debt Obligations [Member] |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) | 0 | 1 | 0 | 2 |
Foreign Government Debt Securities [Member] |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) | 0 | (3) | (1) | (4) |
Residential Mortgage Backed Securities [Member] |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) | 3 | 0 | 8 | 0 |
Fixed Maturities [Member] |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) | 4 | (4) | 8 | (7) |
Equity Securities [Member] |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Available-for-sale Securities, Equity Securities | 0 |  | 0 |  | 282
Available-for-sale Equity Securities, Amortized Cost Basis | 0 |  | 0 |  | 293
Fair Value, Option, Changes in Fair Value, Gain (Loss) | 0 | $ 0 | (34) | $ 3 |
Equity Securities [Member] |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Fair Value of Assets Accounted for Using Fair Value Option | 0 |  | 0 |  | 282
Fixed Maturities [Member] |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Fair Value of Assets Accounted for Using Fair Value Option | 360 |  | 360 |  | 503
Fixed Maturities [Member] | Asset-backed Securities [Member] |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Fair Value of Assets Accounted for Using Fair Value Option | 6 |  | 6 |  | 13
Fixed Maturities [Member] | Corporate Debt Securities [Member] |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Fair Value of Assets Accounted for Using Fair Value Option | 34 |  | 34 |  | 87
Fixed Maturities [Member] | Collateralized Debt Obligations [Member] |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Fair Value of Assets Accounted for Using Fair Value Option | 3 |  | 3 |  | 6
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 | 8 |  | 8 |  | 24
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 | 0 |  | 0 |  | 2
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 | 307 |  | 307 |  | 368
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 | $ 2 |  | $ 2 |  | $ 3

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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 This item represents the cost of equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments for 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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