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Investments - Unrealized Loss Position (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Supporting Experience Rated Products [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | $ 0 | $ 2
Debt Securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 659 | 2,279
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | $ 704 | $ 2,409
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 8 | 36
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 8 | $ 36
Debt Securities [Member] | Supporting Experience Rated Products [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 11 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 0 |
Debt Securities [Member] | Supporting Remaining Products [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 693 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 8 |
US Government Agencies Debt Securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 12 | 8
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | $ 30 | $ 26
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | $ 0 | $ 0
US States and Political Subdivisions Debt Securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 26 | 54
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | $ 39 | $ 86
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 0 | 1
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | $ 0 | $ 1
Debt Security, Corporate, US [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 70 | 1,399
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | $ 94 | $ 1,431
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 1 | 16
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | $ 1 | $ 16
Debt Security, Corporate, Non-US [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 39 | 243
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | $ 47 | $ 314
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 0 | 3
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | $ 0 | $ 3
Residential Mortgage Backed Securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 23 | 45
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | $ 0 | $ 1
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | $ 0 | 0
Commercial Mortgage Backed Securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 1 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | $ 2 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | $ 0 | $ 0
Other Asset-Backed Securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 487 | 516
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | $ 486 | $ 528
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 7 | 15
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | $ 7 | $ 15
Redeemable Preferred Stock [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 1 | 14
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | $ 6 | $ 23
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 0 | 1
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | $ 0 | $ 1

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