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Segments of Operations - Revenues by segment and sub-segment (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total premiums earned |  | $ 1,184 |  | $ 1,200 | $ 2,393 |  | $ 2,373
Net investment income |  | 468 | [1] | 580 | 1,012 | [1] | 1,122
Other income |  | 51 |  | 56 | 108 |  | 112
Revenues before realized gains (losses) |  | 1,747 |  | 1,904 | 3,573 |  | 3,744
Realized gains (losses) on securities |  | 204 |  | 56 | (347) |  | 240
Total revenues |  | 1,951 |  | 1,960 | 3,226 |  | 3,984
Property and Casualty Insurance |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total premiums earned |  | 1,184 |  | 1,200 | 2,393 |  | 2,373
Net investment income |  | 72 | [2] | 124 | 165 | [2] | 228
Other income |  | 3 |  | 2 | 8 |  | 5
Revenues before realized gains (losses) |  | 1,259 |  | 1,326 | 2,566 |  | 2,606
Annuity |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Net investment income |  | 384 |  | 451 | 806 |  | 886
Other income |  | 30 |  | 30 | 65 |  | 58
Revenues before realized gains (losses) |  | 414 |  | 481 | 871 |  | 944
Other |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenues before realized gains (losses) |  | 74 |  | 97 | 136 |  | 194
Specialty Property and transportation | Property and Casualty Insurance |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total premiums earned |  | 390 |  | 379 | 776 |  | 740
Specialty casualty | Property and Casualty Insurance |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total premiums earned |  | 547 |  | 634 | 1,103 |  | 1,263
Specialty financial | Property and Casualty Insurance |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total premiums earned |  | 144 |  | 151 | 300 |  | 297
Other specialty | Property and Casualty Insurance |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total premiums earned |  | 42 |  | 36 | 82 |  | 73
Other lines | Property and Casualty Insurance |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total premiums earned | [3] | $ 61 |  | $ 0 | $ 132 |  | $ 0
[1] | Net investment income in the second quarter and first six months of 2020 includes income of less than $1 million and losses of $6 million, respectively, on investments held by the companies that comprise the Neon exited lines due primarily to the $7 million loss in first quarter of 2020 recorded on equity securities that are carried at fair value through net investment income.
[2] | Includes income of less than $1 million for the second quarter of 2020 and a loss of $6 million in the Neon exited lines in the first six months of 2020 (primarily from the change in fair value of equity securities).
[3] | Represents premiums earned in the Neon exited lines during the second quarter and first six months of 2020. Neon’s $89 million and $177 million in earned premiums during the second quarter and first six months of 2019, respectively, are included in the Specialty casualty sub-segment.

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