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Investments - Debt Securities by Maturity (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Amortized Cost |  |
Less than one year | $ 1,017 |
One year through five years | 5,378 |
After five years through ten years | 3,098 |
Greater than ten years | 3,693 |
Amortized Cost | 15,708 | $ 15,119
Fair Value |  |
Less than one year | 1,022 |
One year through five years | 5,568 |
After five years through ten years | 3,316 |
Greater than ten years | 4,239 |
Total | 16,758 | 15,255
Residential mortgage-backed securities |  |
Amortized Cost |  |
Debt securities, maturity, without single maturity date | 529 |
Amortized Cost | 529 | 567
Fair Value |  |
Debt securities, maturity, without single maturity date | 554 |
Total | 554 | 577
Commercial mortgage-backed securities |  |
Amortized Cost |  |
Debt securities, maturity, without single maturity date | 645 |
Amortized Cost | 645 | 594
Fair Value |  |
Debt securities, maturity, without single maturity date | 701 |
Total | 701 | 605
Other asset-backed securities |  |
Amortized Cost |  |
Debt securities, maturity, without single maturity date | 1,348 |
Amortized Cost | 1,348 | 1,097
Fair Value |  |
Debt securities, maturity, without single maturity date | 1,358 |
Total | $ 1,358 | $ 1,085

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