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Investments, Available-for-Sale Corporate and Other Bonds in Gross Unrealized Loss Position (Details) - Corporate and Other Bonds [Member] - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Available-for-sale Securities [Abstract] |  |
Gross unrealized losses | $ 817 | $ 32
Estimated fair value | 7,080 | $ 1,100
AAA [Member] |  |
Available-for-sale Securities [Abstract] |  |
Estimated fair value | 8 |
AA [Member] |  |
Available-for-sale Securities [Abstract] |  |
Gross unrealized losses | 4 |
Estimated fair value | 134 |
A [Member] |  |
Available-for-sale Securities [Abstract] |  |
Gross unrealized losses | 17 |
Estimated fair value | 608 |
BBB [ Member] |  |
Available-for-sale Securities [Abstract] |  |
Gross unrealized losses | 516 |
Estimated fair value | 4,987 |
Below Investment Grade [Member] |  |
Available-for-sale Securities [Abstract] |  |
Gross unrealized losses | 280 |
Estimated fair value | 1,343 |
Basic Materials [Member] |  |
Available-for-sale Securities [Abstract] |  |
Gross unrealized losses | 78 |
Estimated fair value | 727 |
Communications [Member] |  |
Available-for-sale Securities [Abstract] |  |
Gross unrealized losses | 27 |
Estimated fair value | 349 |
Consumer, Cyclical - Other [Member] |  |
Available-for-sale Securities [Abstract] |  |
Gross unrealized losses | 56 |
Estimated fair value | 390 |
Consumer, Non-cyclical - Other [Member] |  |
Available-for-sale Securities [Abstract] |  |
Gross unrealized losses | 27 |
Estimated fair value | 401 |
Energy - Oil & Gas [Member] |  |
Available-for-sale Securities [Abstract] |  |
Gross unrealized losses | 191 |
Estimated fair value | 575 |
Energy - Pipelines [Member] |  |
Available-for-sale Securities [Abstract] |  |
Gross unrealized losses | 112 |
Estimated fair value | 523 |
Entertainment [Member] |  |
Available-for-sale Securities [Abstract] |  |
Gross unrealized losses | 23 |
Estimated fair value | 148 |
Financial -Other [Member] |  |
Available-for-sale Securities [Abstract] |  |
Gross unrealized losses | 89 |
Estimated fair value | 1,711 |
Financial - Real Estate/REITS [Member] |  |
Available-for-sale Securities [Abstract] |  |
Gross unrealized losses | 45 |
Estimated fair value | 599 |
Industrial [Member] |  |
Available-for-sale Securities [Abstract] |  |
Gross unrealized losses | 55 |
Estimated fair value | 468 |
Retail [Member] |  |
Available-for-sale Securities [Abstract] |  |
Gross unrealized losses | 18 |
Estimated fair value | 150 |
Technology [Member] |  |
Available-for-sale Securities [Abstract] |  |
Gross unrealized losses | 30 |
Estimated fair value | 290 |
Transportation [Member] |  |
Available-for-sale Securities [Abstract] |  |
Gross unrealized losses | 5 |
Estimated fair value | 73 |
Travel & Related [Member] |  |
Available-for-sale Securities [Abstract] |  |
Gross unrealized losses | 37 |
Estimated fair value | 269 |
Utilities [Member] |  |
Available-for-sale Securities [Abstract] |  |
Gross unrealized losses | 24 |
Estimated fair value | $ 407 |

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