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Fair Value Measurements (Assets Measured At Fair Value Using Significant Unobservable Inputs) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Equity Securities [Member] |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Balance- Beginning of Period, Assets | $ 39 | $ 37 | $ 41 | $ 16 |
Transfers Into Level 3, Asset | 0 | 0 | 0 | 0 |
Transfers out of Level 3, Assets | 0 | 0 | 0 | 0 |
Asset, Net realized Gain (Loss) Included in Other Comprehensive Income (Loss) | 0 | 3 | 1 | 2 |
Net Realized Gains/ (Losses), Assets | 1 | 0 | 1 | 1 |
Purchases, Assets | 17 | 0 | 23 | 23 | [1],[2]
Sales, Assets | (5) | (3) | (14) | (5) |
Settlements, Assets | 0 | 0 | 0 | 0 |
Balance-End of Period, Assets | 52 | 37 | 52 | 37 |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) | 0 | 0 | 0 | 0 |
Short-term Investments [Member] |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Balance- Beginning of Period, Assets | 7 | 50 | 25 | 0 |
Transfers Into Level 3, Asset | 0 | 0 | 0 | 0 |
Transfers out of Level 3, Assets | 0 | 0 | 0 | 0 |
Asset, Net realized Gain (Loss) Included in Other Comprehensive Income (Loss) | 0 | 0 | 0 | 0 |
Net Realized Gains/ (Losses), Assets | 0 | 0 | 0 | 0 |
Purchases, Assets | 1 | 12 | 15 | 62 | [1],[2]
Sales, Assets | 0 | 0 | 0 | 0 |
Settlements, Assets | (8) | 0 | (40) | 0 |
Balance-End of Period, Assets | 0 | 62 | 0 | 62 |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) |  | 0 | 0 | 0 |
Other Long-term Investments [Member] |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Balance- Beginning of Period, Assets | 243 | 216 | 225 | 212 |
Transfers Into Level 3, Asset | 0 | 0 | 0 | 0 |
Transfers out of Level 3, Assets | 0 | 0 | 0 | 0 |
Asset, Net realized Gain (Loss) Included in Other Comprehensive Income (Loss) | 0 | 4 | 3 | 4 |
Net Realized Gains/ (Losses), Assets | 0 | 0 | 0 | 0 |
Purchases, Assets | 15 | 8 | 39 | 22 | [1],[2]
Sales, Assets | 0 | 0 | 0 | 0 |
Settlements, Assets | (6) | (5) | (15) | (15) |
Balance-End of Period, Assets | 252 | 223 | 252 | 223 |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) | 0 | 0 | 0 | 0 |
Available-for-sale Securities [Member] | Foreign Government Debt Securities [Member] |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Balance- Beginning of Period, Assets | 85 | 87 | 74 | 57 |
Transfers Into Level 3, Asset | 0 | 0 | 0 | 9 |
Transfers out of Level 3, Assets | (3) | 0 | (3) | (2) |
Asset, Net realized Gain (Loss) Included in Other Comprehensive Income (Loss) | 1 | (1) | 3 | 8 |
Net Realized Gains/ (Losses), Assets | 0 | 0 | 1 | (6) |
Purchases, Assets | 24 | 20 | 57 | 52 | [1],[2]
Sales, Assets | (14) | (2) | (36) | (10) |
Settlements, Assets | (3) | (1) | (6) | (5) |
Balance-End of Period, Assets | 90 | 103 | 90 | 103 |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) | 0 | 0 | 0 | (5) |
Available-for-sale Securities [Member] | Corporate [Member] |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Balance- Beginning of Period, Assets | 747 | 281 | 681 | 174 |
Transfers Into Level 3, Asset | 111 | 0 | 168 | 18 |
Transfers out of Level 3, Assets | (26) | 0 | (93) | 0 |
Asset, Net realized Gain (Loss) Included in Other Comprehensive Income (Loss) | (1) | 6 | (9) | 17 |
Net Realized Gains/ (Losses), Assets | 0 | (4) | (1) | (12) |
Purchases, Assets | 169 | 348 | 390 | 472 | [1],[2]
Sales, Assets | (24) | (18) | (79) | (48) |
Settlements, Assets | (57) | (7) | (138) | (15) |
Balance-End of Period, Assets | 919 | 606 | 919 | 606 |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) | 0 | (4) | 0 | (11) |
Available-for-sale Securities [Member] | Collateralized Mortgage Backed Securities [Member] |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Balance- Beginning of Period, Assets | 45 | 49 | 45 | 53 |
Transfers Into Level 3, Asset | 0 | 0 | 0 | 0 |
Transfers out of Level 3, Assets | 0 | 0 | 0 | 0 |
Asset, Net realized Gain (Loss) Included in Other Comprehensive Income (Loss) | 0 | 0 | 0 | 0 |
Net Realized Gains/ (Losses), Assets | 0 | 0 | 0 | 0 |
Purchases, Assets | 7 | 0 | 8 | 1 | [1],[2]
Sales, Assets | 0 | (3) | (1) | (8) |
Settlements, Assets | (8) | 0 | (8) | 0 |
Balance-End of Period, Assets | 44 | 46 | 44 | 46 |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) | $ 0 | $ 0 | $ 0 | $ 0 |
[1] | Includes acquired invested assets as a result of the Chubb Corp acquisition.
[2] | Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the Consolidated balance sheets. The liability for GLB reinsurance was $1.2 billion at September 30, 2016, and $888 million at December 31, 2015, which includes a fair value derivative adjustment of $883 million and $609 million, respectively.

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- Definition Amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related to those assets still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + 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 (d) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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