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Investments (Short-Term and Long-Term Investments) (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 48,099	$ 47,451
Securities, Available for sale Debt Securities, Gross Unrealized Gains	137	134
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(1,973)	(2,690)
Debt Securities, Available-for-sale	46,263	44,895
Held-to-maturity securities, Amortized Cost	464	603
Securities, Held to maturity, Unrecognized Holding Gain	1	1
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(4)	(8)
Debt Securities, Held-to-maturity, Fair Value	461	596
Debt Securities, Available-for-Sale and Held-to-Maturity, Fair Value	46,724	45,491
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Loss	(1,977)	(2,698)
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Gain	138	135
Debt Securities, Available-for-Sale and Held-to-Maturity, Amortized Cost	48,563	48,054
Debt Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale	46,263	44,895
U.S. Government and Agency Obligations [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	5,005	4,674
Securities, Available for sale Debt Securities, Gross Unrealized Gains	5	3
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(182)	(234)
Debt Securities, Available-for-sale	4,828	4,443
Held-to-maturity securities, Amortized Cost	414	506
Securities, Held to maturity, Unrecognized Holding Gain	1	1
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(2)	(6)
Debt Securities, Held-to-maturity, Fair Value	413	501
State and Municipal Obligations [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	7,301	7,636
Securities, Available for sale Debt Securities, Gross Unrealized Gains	23	39
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(256)	(322)
Debt Securities, Available-for-sale	7,068	7,353
Held-to-maturity securities, Amortized Cost	28	28
Securities, Held to maturity, Unrecognized Holding Gain	0	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(2)	(2)
Debt Securities, Held-to-maturity, Fair Value	26	26
Corporate Obligations [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	23,752	23,136
Securities, Available for sale Debt Securities, Gross Unrealized Gains	82	67
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(781)	(1,186)
Debt Securities, Available-for-sale	23,053	22,017
Held-to-maturity securities, Amortized Cost	22	69
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	22	69
U.S. Agency Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	9,209	8,982
Securities, Available for sale Debt Securities, Gross Unrealized Gains	21	22
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(600)	(708)
Debt Securities, Available-for-sale	8,630	8,296
Non-U.S. Agency Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	2,832	3,023
Securities, Available for sale Debt Securities, Gross Unrealized Gains	6	3
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(154)	(240)
Debt Securities, Available-for-sale	$ 2,684	$ 2,786

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