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Investments (Short-Term and Long-Term Investments) (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 48,832	$ 49,815
Securities, Available for sale Debt Securities, Gross Unrealized Gains	78	62
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(2,463)	(2,958)
Debt Securities, Available-for-sale	46,447	46,919
Held-to-maturity securities, Amortized Cost	492	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	489	508
Debt Securities, Available-for-Sale and Held-to-Maturity, Fair Value	46,936	47,427
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Loss	(2,467)	(2,962)
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Gain	79	62
Debt Securities, Available-for-Sale and Held-to-Maturity, Amortized Cost	49,324	50,327
Debt Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale	46,447	46,919
U.S. Government and Agency Obligations [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	4,276	4,600
Securities, Available for sale Debt Securities, Gross Unrealized Gains	1	1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(212)	(274)
Debt Securities, Available-for-sale	4,065	4,327
Held-to-maturity securities, Amortized Cost	447	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	447	442
State and Municipal Obligations [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	7,110	7,357
Securities, Available for sale Debt Securities, Gross Unrealized Gains	4	2
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(367)	(375)
Debt Securities, Available-for-sale	6,747	6,984
Held-to-maturity securities, Amortized Cost	27	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	24	26
Corporate Obligations [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	24,097	24,391
Securities, Available for sale Debt Securities, Gross Unrealized Gains	65	56
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(924)	(1,140)
Debt Securities, Available-for-sale	23,238	23,307
Held-to-maturity securities, Amortized Cost	18	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	18	40
U.S. Agency Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	10,410	10,577
Securities, Available for sale Debt Securities, Gross Unrealized Gains	5	1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(812)	(994)
Debt Securities, Available-for-sale	9,603	9,584
Non-U.S. Agency Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	2,939	2,890
Securities, Available for sale Debt Securities, Gross Unrealized Gains	3	2
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(148)	(175)
Debt Securities, Available-for-sale	$ 2,794	$ 2,717

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