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Investments - Change in unrealized net capital gains and losses (Details) - USD ($) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 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 | $ (1,423) |  |
Amount recognized for: |  |  |
Insurance reserves | 315 |  |
DAC and DSI | 134 |  |
Amounts recognized | 449 |  |
Deferred income taxes | 206 |  |
Decrease in unrealized net capital gains and losses, after-tax | (768) |  |
Fixed income securities |  |  |
Change in Unrealized Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss) |  |  |
Change in unrealized net capital gains and losses | (1,422) |  |
Equity securities |  |  |
Change in Unrealized Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss) |  |  |
Change in unrealized net capital gains and losses | 0 |  |
Derivatives |  |  |
Change in Unrealized Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss) |  |  |
Change in unrealized net capital gains and losses | (2) |  |
Retained income |  |  |
Amount recognized for: |  |  |
Cumulative effect of change in accounting principle |  | $ 1,088 | $ 0
Retained income | Accounting Standards Update 2016-01 |  |  |
Amount recognized for: |  |  |
Cumulative effect of change in accounting principle |  | $ 1,160 |
EMA limited partnerships |  |  |
Change in Unrealized Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss) |  |  |
Change in unrealized net capital gains and losses | $ 1 |  |

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