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Investments - Unrealized Loss Position Maturities (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Less than one year | $ 16 |
One year through five years | 61 |
After five years through ten years | 128 |
Greater than ten years | 49 |
Fair Value | 600 |
Unrealized Losses |  |
Less than one year | 0 |
One year through five years | 1 |
After five years through ten years | 2 |
Greater than ten years | 0 |
Unrealized Losses | 7 |
Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, maturity, without single maturity date, fair value | 2 |
Fair Value | 2 | $ 1
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 | 344 |
Fair Value | 344 | 528
Unrealized Losses |  |
Debt securities, maturity, without single maturity date, unrealized losses | 4 |
Unrealized Losses | 4 | $ 15
Supporting experience-rated products |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than one year | 0 |
One year through five years | 0 |
After five years through ten years | 3 |
Greater than ten years | 3 |
Fair Value | 6 |
Unrealized Losses |  |
Less than one year | 0 |
One year through five years | 0 |
After five years through ten years | 0 |
Greater than ten years | 0 |
Unrealized Losses | 0 |
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 | Other asset-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 remaining products |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than one year | 16 |
One year through five years | 61 |
After five years through ten years | 125 |
Greater than ten years | 46 |
Fair Value | 594 |
Unrealized Losses |  |
Less than one year | 0 |
One year through five years | 1 |
After five years through ten years | 2 |
Greater than ten years | 0 |
Unrealized Losses | 7 |
Supporting remaining products | Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, maturity, without single maturity date, fair value | 2 |
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 | 344 |
Unrealized Losses |  |
Debt securities, maturity, without single maturity date, unrealized losses | $ 4 |

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