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Investments - Investments - Fixed Maturities, AFS, by Contractual Maturity Year (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Amortized Cost |  |
One year or less | $ 1,312 | $ 1,082
Over one year through five years | 7,274 | 7,200
Over five years through ten years | 7,601 | 7,395
Over ten years | 12,003 | 11,769
Subtotal | 28,190 | 27,446
Mortgage-backed and asset-backed securities | 11,450 | 12,632
Fixed maturities, available-for-sale, at fair value, amortized cost | 39,640 | 40,078
Fair Value |  |
One year or less | 1,324 | 1,090
Over one year through five years | 7,556 | 7,401
Over five years through ten years | 8,129 | 7,803
Over ten years | 13,482 | 12,988
Subtotal | 30,491 | 29,282
Mortgage-backed and asset-backed securities | 11,709 | 12,866
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | $ 42,200 | $ 42,148

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