Investments (Short-Term and Long-Term Investments) (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 48,683	$ 49,815
Securities, Available for sale Debt Securities, Gross Unrealized Gains	131	62
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(2,206)	(2,958)
Debt Securities, Available-for-sale	46,608	46,919
Held-to-maturity securities, Amortized Cost	493	512
Securities, Held to maturity, Unrecognized Holding Gain	1	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(4)	(4)
Debt Securities, Held-to-maturity, Fair Value	490	508
Debt Securities, Available-for-Sale and Held-to-Maturity, Fair Value	47,098	47,427
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Loss	(2,210)	(2,962)
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Gain	132	62
Debt Securities, Available-for-Sale and Held-to-Maturity, Amortized Cost	49,176	50,327
Debt Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale	46,608	46,919
U.S. Government and Agency Obligations [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	4,189	4,600
Securities, Available for sale Debt Securities, Gross Unrealized Gains	3	1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(186)	(274)
Debt Securities, Available-for-sale	4,006	4,327
Held-to-maturity securities, Amortized Cost	448	444
Securities, Held to maturity, Unrecognized Holding Gain	1	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(1)	(2)
Debt Securities, Held-to-maturity, Fair Value	448	442
State and Municipal Obligations [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	7,234	7,357
Securities, Available for sale Debt Securities, Gross Unrealized Gains	7	2
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(375)	(375)
Debt Securities, Available-for-sale	6,866	6,984
Held-to-maturity securities, Amortized Cost	26	28
Securities, Held to maturity, Unrecognized Holding Gain	0	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(3)	(2)
Debt Securities, Held-to-maturity, Fair Value	23	26
Corporate Obligations [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	24,044	24,391
Securities, Available for sale Debt Securities, Gross Unrealized Gains	106	56
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(735)	(1,140)
Debt Securities, Available-for-sale	23,415	23,307
Held-to-maturity securities, Amortized Cost	19	40
Securities, Held to maturity, Unrecognized Holding Gain	0	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Debt Securities, Held-to-maturity, Fair Value	19	40
U.S. Agency Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	10,341	10,577
Securities, Available for sale Debt Securities, Gross Unrealized Gains	8	1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(783)	(994)
Debt Securities, Available-for-sale	9,566	9,584
Non-U.S. Agency Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	2,875	2,890
Securities, Available for sale Debt Securities, Gross Unrealized Gains	7	2
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(127)	(175)
Debt Securities, Available-for-sale	$ 2,755	$ 2,717

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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