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INVESTMENTS - Information Regarding Pretax Realized Gains and Losses From Investments (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |
Other-than-temporary impairment losses realized | [1] | $ (22) |  | $ (137) |  | $ (69) |  | $ (143)
Derivative gains (losses) |  | (107) |  | (3) |  | (278) |  | (17)
Total realized investment gains (losses) |  | (146) |  | (114) |  | (260) |  | 26
Derivatives and other |  |  |  |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |
Total realized investment gains (losses) |  | (107) |  | (3) |  | (278) |  | (17)
Fixed maturities: |  |  |  |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |
Total realized investment gains (losses) |  | (23) |  | (110) |  | 26 |  | 14
Perpetual securities: |  |  |  |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |
Other-than-temporary impairment losses realized |  | 0 |  | 0 |  | (2) |  | 0
Total realized investment gains (losses) |  | 0 |  | 0 |  | 38 |  | 30
Equity securities |  |  |  |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |
Gross gains from sales |  | 5 |  | 0 |  | 10 |  | 0
Gross losses from sales |  | 0 |  | 0 |  | (11) |  | 0
Other-than-temporary impairment losses realized |  | (21) |  | (1) |  | (45) |  | (1)
Total realized investment gains (losses) |  | (16) |  | (1) |  | (46) |  | (1)
Available-for-sale securities | Fixed maturities: |  |  |  |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |
Gross gains from sales |  | 2 |  | 20 | [2] | 10 |  | 124
Gross losses from sales |  | (20) | [2] | (6) |  | (36) | [2] | (6)
Net gains (losses) from redemptions |  | (4) | [2] | 12 | [2] | 74 | [2] | 38
Other-than-temporary impairment losses realized |  | (1) | [2] | (136) |  | (22) | [2] | (142)
Available-for-sale securities | Perpetual securities: |  |  |  |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |
Net gains (losses) from redemptions |  | 0 |  | 0 |  | 40 |  | 30
Other-than-temporary impairment losses realized |  | $ 0 |  | $ 0 |  | $ (2) |  | $ 0
[1] | Includes $22 and $6 for the three-month periods and $69 and $12 for the nine-month periods ended September 30, 2016 and 2015, respectively, from change in intent to sell securities or change in intent to hold securities until recovery; and $131 for the three- and nine-month periods ended September 30, 2015, for credit-related impairments
[2] | Primarily driven by foreign exchange

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- Definition This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563 + Details
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- Definition Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5618551-113959 + Details
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- Definition This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (c)-(e) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c),9(a)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27405-111563 + Details
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