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Investments - Investments - Fixed Maturities, AFS, by Contractual Maturity Year (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Amortized Cost |  |
One year or less | $ 1,224 | $ 1,411
Over one year through five years | 7,949 | 7,832
Over five years through ten years | 8,817 | 7,622
Over ten years | 11,554 | 12,206
Subtotal | 29,544 | 29,071
Mortgage-backed and asset-backed securities | 11,676 | 12,490
Fixed maturities, available-for-sale, at fair value, amortized cost | 41,220 | 41,561
Fair Value |  |
One year or less | 1,241 | 1,432
Over one year through five years | 8,376 | 8,286
Over five years through ten years | 9,323 | 8,354
Over ten years | 13,047 | 14,028
Subtotal | 31,987 | 32,100
Mortgage-backed and asset-backed securities | 12,036 | 12,935
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | $ 44,023 | $ 45,035

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