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Fair Value Measurements Level 4 Fair Value Option (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Available-for-sale Securities, Equity Securities | $ 827 |  | $ 827 |  | $ 1,121
Available-for-sale Equity Securities, Amortized Cost Basis | 772 |  | 772 |  | 1,135
Fair Value of Assets Accounted for Using Fair Value Option | 180,046 |  | 180,046 |  | 181,633
Fair Value, Option, Changes in Fair Value, Gain (Loss) | 4 | $ (4) | (30) | $ 0 |
Corporate Debt Securities [Member] |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) | 0 | (3) | 0 | (3) |
Collateralized Debt Obligations [Member] |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) | 0 | 0 | 0 | 1 |
Foreign Government Debt Securities [Member] |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) | 0 | (1) | (1) | (1) |
Residential Mortgage Backed Securities [Member] |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) | 4 | (1) | 5 | 0 |
Fixed Maturities [Member] |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) | 4 | (5) | 4 | (3) |
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 |  |  |  |  | 293
Fair Value, Option, Changes in Fair Value, Gain (Loss) | 0 | $ 1 | (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 | 411 |  | 411 |  | 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 | 35 |  | 35 |  | 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 | 4 |  | 4 |  | 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 | 356 |  | 356 |  | 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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- 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=51813488&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=49167202&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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- 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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