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Investments - Debt Securities by Maturity (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Amortized Cost |  |
Less than one year | $ 1,315 |
One year through five years | 6,596 |
After five years through ten years | 4,899 |
Greater than ten years | 4,296 |
Net Amortized Cost | 22,063 | $ 22,174
Fair Value |  |
Less than one year | 1,305 |
One year through five years | 6,206 |
After five years through ten years | 4,401 |
Greater than ten years | 3,783 |
Total | 20,280 | 23,240
Residential mortgage-backed securities |  |
Amortized Cost |  |
Debt securities, maturity, without single maturity date | 845 |
Net Amortized Cost | 845 | 870
Fair Value |  |
Debt securities, maturity, without single maturity date | 757 |
Total | 757 | 875
Commercial mortgage-backed securities |  |
Amortized Cost |  |
Debt securities, maturity, without single maturity date | 1,172 |
Net Amortized Cost | 1,172 | 1,278
Fair Value |  |
Debt securities, maturity, without single maturity date | 1,018 |
Total | 1,018 | 1,310
Other asset-backed securities |  |
Amortized Cost |  |
Debt securities, maturity, without single maturity date | 2,940 |
Net Amortized Cost | 2,940 | 2,791
Fair Value |  |
Debt securities, maturity, without single maturity date | 2,810 |
Total | $ 2,810 | $ 2,792

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