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Investments - Investments - Net Realized Capital Gains (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Schedule of Investments [Line Items] |  |  |  |
Gross gains on sales | $ 26,000,000 | $ 46,000,000 | $ 91,000,000 | $ 184,000,000
Gross losses on sales | (41,000,000) | (16,000,000) | (129,000,000) | (84,000,000)
Net OTTI losses recognized in earnings | (1,000,000) | (1,000,000) | (1,000,000) | (4,000,000)
Transactional foreign currency revaluation | 0 | 0 | 1,000,000 | 14,000,000
Net realized capital gains | 38,000,000 | 26,000,000 | 60,000,000 | 105,000,000
Other net realized capital gains | 39,000,000 | 27,000,000 | 61,000,000 | 109,000,000
Proceeds from Sale of Available-for-sale Securities | 4,600,000,000 | 2,900,000,000 | 13,100,000,000 | 11,400,000,000
Net Realized and Unrealized Gain (Loss) on Trading Securities | 41 |  | 50 |
Net Unrealized Gain on Securities | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Other net realized capital gains | (15,000,000) | 32,000,000 | (59,000,000) | 102,000,000
Non-qualifying foreign currency derivatives |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Non-qualifying foreign currency derivatives | 9,000,000 | (1,000,000) | 8,000,000 | (7,000,000)
Non-qualifying foreign currency derivatives | Other Credit Derivatives |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Non-qualifying foreign currency derivatives | 8,000,000 | (1,000,000) | 6,000,000 | 7,000,000
Other, net |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Other, net | 7,000,000 | (3,000,000) | 8,000,000 | 9,000,000
Equity Securities [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Equity securities | 46,000,000 | 0 | 88,000,000 | 0
Net OTTI losses recognized in earnings | 0 | (1,000,000) | 0 | (2,000,000)
Foreign Exchange Forward [Member] | Non-qualifying foreign currency derivatives |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Non-qualifying foreign currency derivatives | $ 1,000,000 | $ 0 | $ 2,000,000 | $ (14,000,000)

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- Definition Amount of unrealized and realized gain (loss) on investment in debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(9)(a)) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(7)(c)) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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- Definition Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109240200&loc=d3e30700-110894 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109240200&loc=d3e30690-110894 + 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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- Definition The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3(a)) -URI http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263 + Details
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