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Fair Value Measurements Level 4 Fair Value Option (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) | $ (1) | $ 4 | $ 1 | $ (26) |
Equity securities, available-for-sale, at fair value (cost of $1,010 and $1,020) | 1,112 |  | 1,112 |  | $ 1,097
Available-for-sale Equity Securities, Amortized Cost Basis | 1,010 |  | 1,010 |  | 1,020
Fair Value of Assets Accounted for Using Fair Value Option | 176,138 |  | 176,138 |  | 172,243
Corporate Debt Securities [Member] |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) | 0 | 1 | (1) | 1 |
Foreign Government Debt Securities [Member] |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) | 0 | 0 | 0 | (1) |
Residential Mortgage Backed Securities [Member] |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) | (1) | 3 | 0 | 8 |
Fixed Maturities [Member] |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) | (1) | 4 | (1) | 8 |
Equity Securities [Member] |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) | 0 | $ 0 | 2 | $ (34) |
Equity securities, available-for-sale, at fair value (cost of $1,010 and $1,020) | 0 |  | 0 |  | 0
Equity Securities [Member] |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Fair Value of Assets Accounted for Using Fair Value Option | 0 |  | 0 |  | 0
Fixed Maturities [Member] |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Fair Value of Assets Accounted for Using Fair Value Option | 82 |  | 82 |  | 293
Fixed Maturities [Member] | Asset-backed Securities [Member] |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Fair Value of Assets Accounted for Using Fair Value Option | 0 |  | 0 |  | 7
Fixed Maturities [Member] | Corporate Debt Securities [Member] |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Fair Value of Assets Accounted for Using Fair Value Option | 0 |  | 0 |  | 40
Fixed Maturities [Member] | Collateralized Debt Obligations [Member] |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Fair Value of Assets Accounted for Using Fair Value Option | 0 |  | 0 |  | 3
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 | 0 |  | 0 |  | 8
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 | 82 |  | 82 |  | 228
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 | $ 0 |  | $ 0 |  | $ 7

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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=66048111&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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- Definition Amount of equity securities categorized neither as held-to-maturity nor as trading. + 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=65884222&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 + Details
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