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Investments - Unrealized Loss Position Maturities (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value |  |
Less than one year | $ 1,107 |
One year through five years | 5,528 |
After five years through ten years | 2,504 |
Greater than ten years | 2,470 |
Fair Value | 14,242 | $ 12,548
Unrealized Losses |  |
Less than one year | 19 |
One year through five years | 235 |
After five years through ten years | 181 |
Greater than ten years | 268 |
Unrealized Losses | 873 | 836
Residential mortgage-backed securities |  |
Fair Value |  |
Debt securities, maturity, without single maturity date, fair value | 611 |
Fair Value | 611 | 614
Unrealized Losses |  |
Debt securities, maturity, without single maturity date, unrealized losses | 62 |
Unrealized Losses | 62 | 60
Commercial mortgage-backed securities |  |
Fair Value |  |
Debt securities, maturity, without single maturity date, fair value | 719 |
Fair Value | 719 | 675
Unrealized Losses |  |
Debt securities, maturity, without single maturity date, unrealized losses | 93 |
Unrealized Losses | 93 | 100
Other asset-backed securities |  |
Fair Value |  |
Debt securities, maturity, without single maturity date, fair value | 1,303 |
Fair Value | 1,303 | 1,316
Unrealized Losses |  |
Debt securities, maturity, without single maturity date, unrealized losses | 15 |
Unrealized Losses | 15 | $ 18
Supporting experience-rated products |  |
Fair Value |  |
Less than one year | 14 |
One year through five years | 126 |
After five years through ten years | 78 |
Greater than ten years | 165 |
Fair Value | 420 |
Unrealized Losses |  |
Less than one year | 0 |
One year through five years | 4 |
After five years through ten years | 8 |
Greater than ten years | 18 |
Unrealized Losses | 32 |
Supporting experience-rated products | Residential mortgage-backed securities |  |
Fair Value |  |
Debt securities, maturity, without single maturity date, fair value | 7 |
Unrealized Losses |  |
Debt securities, maturity, without single maturity date, unrealized losses | 0 |
Supporting experience-rated products | Commercial mortgage-backed securities |  |
Fair Value |  |
Debt securities, maturity, without single maturity date, fair value | 15 |
Unrealized Losses |  |
Debt securities, maturity, without single maturity date, unrealized losses | 1 |
Supporting experience-rated products | Other asset-backed securities |  |
Fair Value |  |
Debt securities, maturity, without single maturity date, fair value | 15 |
Unrealized Losses |  |
Debt securities, maturity, without single maturity date, unrealized losses | 1 |
Supporting remaining products |  |
Fair Value |  |
Less than one year | 1,093 |
One year through five years | 5,402 |
After five years through ten years | 2,426 |
Greater than ten years | 2,305 |
Fair Value | 13,822 |
Unrealized Losses |  |
Less than one year | 19 |
One year through five years | 231 |
After five years through ten years | 173 |
Greater than ten years | 250 |
Unrealized Losses | 841 |
Supporting remaining products | Residential mortgage-backed securities |  |
Fair Value |  |
Debt securities, maturity, without single maturity date, fair value | 604 |
Unrealized Losses |  |
Debt securities, maturity, without single maturity date, unrealized losses | 62 |
Supporting remaining products | Commercial mortgage-backed securities |  |
Fair Value |  |
Debt securities, maturity, without single maturity date, fair value | 704 |
Unrealized Losses |  |
Debt securities, maturity, without single maturity date, unrealized losses | 92 |
Supporting remaining products | Other asset-backed securities |  |
Fair Value |  |
Debt securities, maturity, without single maturity date, fair value | 1,288 |
Unrealized Losses |  |
Debt securities, maturity, without single maturity date, unrealized losses | $ 14 |

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