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Investments - Unrealized Loss Position Maturities (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Less than one year | $ 3 |
One year through five years | 138 |
After five years through ten years | 136 |
Greater than ten years | 110 |
Fair Value | 790 | $ 2,409
Unrealized Losses |  |
Less than one year | 0 |
One year through five years | 2 |
After five years through ten years | 4 |
Greater than ten years | 2 |
Unrealized Losses | 13 | 36
Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, maturity, without single maturity date, fair value | 17 |
Fair Value | 17 | 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 | 386 |
Fair Value | 386 | 528
Unrealized Losses |  |
Debt securities, maturity, without single maturity date, unrealized losses | 5 |
Unrealized Losses | 5 | $ 15
Supporting experience-rated products |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than one year | 0 |
One year through five years | 1 |
After five years through ten years | 8 |
Greater than ten years | 11 |
Fair Value | 30 |
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 | 10 |
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 | 3 |
One year through five years | 137 |
After five years through ten years | 128 |
Greater than ten years | 99 |
Fair Value | 760 |
Unrealized Losses |  |
Less than one year | 0 |
One year through five years | 2 |
After five years through ten years | 4 |
Greater than ten years | 2 |
Unrealized Losses | 13 |
Supporting remaining products | Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, maturity, without single maturity date, fair value | 17 |
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 | 376 |
Unrealized Losses |  |
Debt securities, maturity, without single maturity date, unrealized losses | $ 5 |

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