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Investments - Unrealized Loss (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	$ 20,691	$ 27,288
Gross Unrealized Losses	2,295	3,039
Additional impairment losses	0
AAA
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	1,367	1,800
Gross Unrealized Losses	248	282
AA
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	3,765	4,247
Gross Unrealized Losses	633	730
A
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	5,049	6,330
Gross Unrealized Losses	436	582
BBB
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	7,846	11,548
Gross Unrealized Losses	627	980
U.S. Government, Government agencies and Government-sponsored enterprises
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	1,959	2,567
Gross Unrealized Losses	281	373
Non-investment grade
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	705	796
Gross Unrealized Losses	$ 70	$ 92

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Amount of additional other-than-temporary impairment losses on investments in available-for-sale securities.

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