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Investments - Debt Securities by Maturity (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Amortized Cost |  |
Less than one year | $ 1,056 |
One year through five years | 5,264 |
After five years through ten years | 3,154 |
Greater than ten years | 3,713 |
Total | 15,588 | $ 15,119
Fair Value |  |
Less than one year | 1,060 |
One year through five years | 5,441 |
After five years through ten years | 3,353 |
Greater than ten years | 4,136 |
Total | 16,469 | 15,255
Residential mortgage-backed securities |  |
Amortized Cost |  |
Debt securities, maturity, without single maturity date | 542 |
Total | 542 | 567
Fair Value |  |
Debt securities, maturity, without single maturity date | 564 |
Total | 564 | 577
Commercial mortgage-backed securities |  |
Amortized Cost |  |
Debt securities, maturity, without single maturity date | 612 |
Total | 612 | 594
Fair Value |  |
Debt securities, maturity, without single maturity date | 658 |
Total | 658 | 605
Other asset-backed securities |  |
Amortized Cost |  |
Debt securities, maturity, without single maturity date | 1,247 |
Total | 1,247 | 1,097
Fair Value |  |
Debt securities, maturity, without single maturity date | 1,257 |
Total | $ 1,257 | $ 1,085

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