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Investments - Net Realized Capital Gains (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Schedule of Investments [Line Items] |  |  |
Gross gains on sales | $ 114 | $ 275 | $ 222
Gross losses on sales | (172) | (113) | (159)
Net OTTI losses recognized in earnings | (1) | (8) | (27)
Transactional foreign currency revaluation | 1 | 14 | (78)
Total net realized capital gains (losses) | (112) | 165 | (110)
Other investments |  |  |
Schedule of Investments [Line Items] |  |  |
Other, net | (9) | 12 | (151)
Non-qualifying |  |  |
Schedule of Investments [Line Items] |  |  |
Non-qualifying foreign currency derivatives | (12) | (6) | 74
Foreign Currency Derivatives | Non-qualifying |  |  |
Schedule of Investments [Line Items] |  |  |
Non-qualifying foreign currency derivatives | 3 | (14) | 83
Equity Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Debt and Equity Securities, Gain (Loss) | (48) | 0 | 0
Net OTTI losses recognized in earnings |  | (6) | (4)
Mortgage loans |  |  |
Schedule of Investments [Line Items] |  |  |
Valuation allowances on mortgage loans | 0 | (1) | 0
Other Credit Derivatives [Member] | Non-qualifying |  |  |
Schedule of Investments [Line Items] |  |  |
Non-qualifying foreign currency derivatives | $ (15) | $ 8 | $ (9)

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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 of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + 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 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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