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Investments - Unrealized Loss Position Maturities (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Less than one year | $ 48 |
One year through five years | 370 |
After five years through ten years | 326 |
Greater than ten years | 259 |
Fair Value | 1,768 | $ 1,169
Unrealized Losses |  |
Less than one year | 0 |
One year through five years | 9 |
After five years through ten years | 12 |
Greater than ten years | 10 |
Unrealized Losses | 53 | 11
Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, maturity, without single maturity date, fair value | 52 |
Fair Value | 52 | 16
Unrealized Losses |  |
Debt securities, maturity, without single maturity date, unrealized losses | 0 |
Unrealized Losses | 0 | 0
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, maturity, without single maturity date, fair value | 65 |
Fair Value | 65 | 49
Unrealized Losses |  |
Debt securities, maturity, without single maturity date, unrealized losses | 0 |
Unrealized Losses | 0 | 0
Other asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, maturity, without single maturity date, fair value | 648 |
Fair Value | 648 | 436
Unrealized Losses |  |
Debt securities, maturity, without single maturity date, unrealized losses | 22 |
Unrealized Losses | 22 | $ 5
Supporting experience-rated products |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than one year | 3 |
One year through five years | 5 |
After five years through ten years | 10 |
Greater than ten years | 3 |
Fair Value | 33 |
Unrealized Losses |  |
Less than one year | 0 |
One year through five years | 0 |
After five years through ten years | 0 |
Greater than ten years | 1 |
Unrealized Losses | 2 |
Supporting experience-rated products | Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, maturity, without single maturity date, fair value | 0 |
Unrealized Losses |  |
Debt securities, maturity, without single maturity date, unrealized losses | 0 |
Supporting experience-rated products | Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, maturity, without single maturity date, fair value | 0 |
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 | 12 |
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 | 45 |
One year through five years | 365 |
After five years through ten years | 316 |
Greater than ten years | 256 |
Fair Value | 1,735 |
Unrealized Losses |  |
Less than one year | 0 |
One year through five years | 9 |
After five years through ten years | 12 |
Greater than ten years | 9 |
Unrealized Losses | 51 |
Supporting remaining products | Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, maturity, without single maturity date, fair value | 52 |
Unrealized Losses |  |
Debt securities, maturity, without single maturity date, unrealized losses | 0 |
Supporting remaining products | Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, maturity, without single maturity date, fair value | 65 |
Unrealized Losses |  |
Debt securities, maturity, without single maturity date, unrealized losses | 0 |
Supporting remaining products | Other asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, maturity, without single maturity date, fair value | 636 |
Unrealized Losses |  |
Debt securities, maturity, without single maturity date, unrealized losses | $ 21 |

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