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Investments - Debt Securities by Maturity (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Net Amortized Cost |  |
Less than one year | $ 1,228 |
One year through five years | 7,165 |
After five years through ten years | 5,128 |
Greater than ten years | 4,375 |
Net Amortized Cost | 22,796 | $ 22,174
Fair Value |  |
Less than one year | 1,235 |
One year through five years | 7,038 |
After five years through ten years | 4,965 |
Greater than ten years | 4,515 |
Total | 22,498 | 23,240
Residential mortgage-backed securities |  |
Net Amortized Cost |  |
Debt securities, maturity, without single maturity date | 910 |
Net Amortized Cost | 910 | 870
Fair Value |  |
Debt securities, maturity, without single maturity date | 867 |
Total | 867 | 875
Commercial mortgage-backed securities |  |
Net Amortized Cost |  |
Debt securities, maturity, without single maturity date | 1,284 |
Net Amortized Cost | 1,284 | 1,278
Fair Value |  |
Debt securities, maturity, without single maturity date | 1,225 |
Total | 1,225 | 1,310
Other asset-backed securities |  |
Net Amortized Cost |  |
Debt securities, maturity, without single maturity date | 2,706 |
Net Amortized Cost | 2,706 | 2,791
Fair Value |  |
Debt securities, maturity, without single maturity date | 2,653 |
Total | $ 2,653 | $ 2,792

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