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Investments - Change in unrealized net capital gains and losses (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Change in Unrealized Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss) |  |  |
Change in unrealized net capital gains and losses | $ (1,434) | $ 857 | $ 745
Equity securities |  | 1,160 |
Amounts recognized for: |  |  |
Insurance reserves | 315 | (315) | 0
DAC and DSI | 163 | (50) | (79)
Amounts recognized | 478 | (365) | (79)
Deferred income taxes | 202 | 117 | (233)
(Decrease) increase in unrealized net capital gains and losses, after-tax | (754) | 609 | 433
EMA limited partnerships |  |  |
Change in Unrealized Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss) |  |  |
Change in unrealized net capital gains and losses | (1) | 5 | 0
Fixed income securities |  |  |
Change in Unrealized Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss) |  |  |
Change in unrealized net capital gains and losses | (1,431) | 204 | 516
Equity securities |  |  |
Change in Unrealized Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss) |  |  |
Change in unrealized net capital gains and losses | 0 | 651 | 233
Derivatives |  |  |
Change in Unrealized Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss) |  |  |
Change in unrealized net capital gains and losses | (2) | (3) | $ (4)
Accounting Standards Update 2016-01 |  |  |
Change in Unrealized Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss) |  |  |
Equity securities | $ 1,160 | $ 1,160 |

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- Definition The amount of unrealized gains (losses) included in accumulated other comprehensive income on equity securities which are categorized neither as held-to-maturity nor trading securities, as a result of fair value exceeding (under) its amortized cost, as of the balance sheet date. + References No definition available. + Details
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- Definition Amount before tax, after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 + Details
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