Investments - Debt Securities by Maturity (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Amortized Cost
Less than one year	$ 1,365
One year through five years	8,974
After five years through ten years	4,420
Greater than ten years	3,560
Amortized Cost	24,548	$ 22,282
Fair Value
Less than one year	1,349
One year through five years	8,784
After five years through ten years	4,288
Greater than ten years	3,310
Fair Value	23,831	21,713
Residential mortgage-backed securities
Amortized Cost
Debt securities, maturity, without single maturity date	838
Amortized Cost	838	862
Fair Value
Debt securities, maturity, without single maturity date	781
Fair Value	781	810
Commercial mortgage-backed securities
Amortized Cost
Debt securities, maturity, without single maturity date	1,201
Amortized Cost	1,201	1,066
Fair Value
Debt securities, maturity, without single maturity date	1,113
Fair Value	1,113	975
Other asset-backed securities
Amortized Cost
Debt securities, maturity, without single maturity date	4,190
Amortized Cost	4,190	3,294
Fair Value
Debt securities, maturity, without single maturity date	4,206
Fair Value	$ 4,206	$ 3,302

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