Investments - Corporate Debt Securities by Industry Group (Details)
|
Dec. 31, 2019 |
Dec. 31, 2018 |
| Debt Securities, Available-for-sale [Line Items] |
|
|
| Corporate debt securities as component of total (percent) |
100.00%
|
100.00%
|
| Financial |
|
|
| Debt Securities, Available-for-sale [Line Items] |
|
|
| Corporate debt securities as component of total (percent) |
38.00%
|
38.00%
|
| Consumer |
|
|
| Debt Securities, Available-for-sale [Line Items] |
|
|
| Corporate debt securities as component of total (percent) |
26.00%
|
27.00%
|
| Communications |
|
|
| Debt Securities, Available-for-sale [Line Items] |
|
|
| Corporate debt securities as component of total (percent) |
10.00%
|
12.00%
|
| Utilities |
|
|
| Debt Securities, Available-for-sale [Line Items] |
|
|
| Corporate debt securities as component of total (percent) |
9.00%
|
7.00%
|
| Industrial |
|
|
| Debt Securities, Available-for-sale [Line Items] |
|
|
| Corporate debt securities as component of total (percent) |
8.00%
|
7.00%
|
| Technology |
|
|
| Debt Securities, Available-for-sale [Line Items] |
|
|
| Corporate debt securities as component of total (percent) |
7.00%
|
6.00%
|
| Energy |
|
|
| Debt Securities, Available-for-sale [Line Items] |
|
|
| Corporate debt securities as component of total (percent) |
2.00%
|
2.00%
|
| Other |
|
|
| Debt Securities, Available-for-sale [Line Items] |
|
|
| Corporate debt securities as component of total (percent) |
0.00%
|
1.00%
|