Investments - Schedule of Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value for Fixed Income Securities (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Schedule of Available for Sale Securities
Amortized cost, net	$ 58,730	$ 53,616
Gross unrealized gains	777	361
Gross unrealized losses	(392)	(1,230)
Fixed income securities, at fair value	59,115	52,747
U.S. government and agencies
Schedule of Available for Sale Securities
Amortized cost, net	18,165	11,423
Gross unrealized gains	43	15
Gross unrealized losses	(75)	(330)
Fixed income securities, at fair value	18,133	11,108
Municipal
Schedule of Available for Sale Securities
Amortized cost, net	5,617	8,985
Gross unrealized gains	87	33
Gross unrealized losses	(61)	(176)
Fixed income securities, at fair value	5,643	8,842
Corporate
Schedule of Available for Sale Securities
Amortized cost, net	30,050	30,630
Gross unrealized gains	585	272
Gross unrealized losses	(234)	(710)
Fixed income securities, at fair value	30,401	30,192
Foreign government
Schedule of Available for Sale Securities
Amortized cost, net	1,464	1,352
Gross unrealized gains	13	22
Gross unrealized losses	(17)	(10)
Fixed income securities, at fair value	1,460	1,364
ABS
Schedule of Available for Sale Securities
Amortized cost, net	1,348	1,130
Gross unrealized gains	8	19
Gross unrealized losses	(4)	(4)
Fixed income securities, at fair value	1,352	1,145
MBS
Schedule of Available for Sale Securities
Amortized cost, net	2,086	96
Gross unrealized gains	41	0
Gross unrealized losses	(1)	0
Fixed income securities, at fair value	$ 2,126	$ 96

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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