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Investments - Unrealized Loss Position Maturities (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Less than one year | $ 170 |
One year through five years | 1,112 |
After five years through ten years | 837 |
Greater than ten years | 570 |
Fair Value | 3,700 | $ 1,169
Unrealized Losses |  |
Less than one year | 3 |
One year through five years | 45 |
After five years through ten years | 64 |
Greater than ten years | 53 |
Unrealized Losses | 246 | 11
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, maturity, without single maturity date, fair value | 50 |
Fair Value | 50 | 49
Unrealized Losses |  |
Debt securities, maturity, without single maturity date, unrealized losses | 1 |
Unrealized Losses | 1 | 0
Other asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, maturity, without single maturity date, fair value | 961 |
Fair Value | 961 | 436
Unrealized Losses |  |
Debt securities, maturity, without single maturity date, unrealized losses | 80 |
Unrealized Losses | 80 | $ 5
Supporting experience-rated products |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than one year | 7 |
One year through five years | 30 |
After five years through ten years | 61 |
Greater than ten years | 55 |
Fair Value | 170 |
Unrealized Losses |  |
Less than one year | 0 |
One year through five years | 1 |
After five years through ten years | 4 |
Greater than ten years | 4 |
Unrealized Losses | 10 |
Supporting experience-rated products | Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, maturity, without single maturity date, fair value | 1 |
Unrealized Losses |  |
Debt securities, maturity, without single maturity date, unrealized losses | 0 |
Supporting experience-rated products | Other asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, maturity, without single maturity date, fair value | 16 |
Unrealized Losses |  |
Debt securities, maturity, without single maturity date, unrealized losses | 1 |
Supporting remaining products |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than one year | 163 |
One year through five years | 1,082 |
After five years through ten years | 776 |
Greater than ten years | 515 |
Fair Value | 3,530 |
Unrealized Losses |  |
Less than one year | 3 |
One year through five years | 44 |
After five years through ten years | 60 |
Greater than ten years | 49 |
Unrealized Losses | 236 |
Supporting remaining products | Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, maturity, without single maturity date, fair value | 49 |
Unrealized Losses |  |
Debt securities, maturity, without single maturity date, unrealized losses | 1 |
Supporting remaining products | Other asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, maturity, without single maturity date, fair value | 945 |
Unrealized Losses |  |
Debt securities, maturity, without single maturity date, unrealized losses | $ 79 |

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