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Investments (Short-Term and Long-Term Investments) (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 47,713	$ 47,451
Securities, Available for sale Debt Securities, Gross Unrealized Gains	21	134
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(3,000)	(2,690)
Debt Securities, Available-for-sale	44,734	44,895
Held-to-maturity securities, Amortized Cost	565	603
Securities, Held to maturity, Unrecognized Holding Gain	0	1
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(7)	(8)
Debt Securities, Held-to-maturity, Fair Value	558	596
Debt Securities, Available-for-Sale and Held-to-Maturity, Fair Value	45,292	45,491
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Loss	(3,007)	(2,698)
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Gain	21	135
Debt Securities, Available-for-Sale and Held-to-Maturity, Amortized Cost	48,278	48,054
Debt Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale	44,734	44,895
U.S. Government and Agency Obligations [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	5,007	4,674
Securities, Available for sale Debt Securities, Gross Unrealized Gains	0	3
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(264)	(234)
Debt Securities, Available-for-sale	4,743	4,443
Held-to-maturity securities, Amortized Cost	413	506
Securities, Held to maturity, Unrecognized Holding Gain	0	1
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(4)	(6)
Debt Securities, Held-to-maturity, Fair Value	409	501
State and Municipal Obligations [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	7,299	7,636
Securities, Available for sale Debt Securities, Gross Unrealized Gains	4	39
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(397)	(322)
Debt Securities, Available-for-sale	6,906	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	(3)	(2)
Debt Securities, Held-to-maturity, Fair Value	25	26
Corporate Obligations [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	23,193	23,136
Securities, Available for sale Debt Securities, Gross Unrealized Gains	14	67
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(1,222)	(1,186)
Debt Securities, Available-for-sale	21,985	22,017
Held-to-maturity securities, Amortized Cost	124	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	124	69
U.S. Agency Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	9,320	8,982
Securities, Available for sale Debt Securities, Gross Unrealized Gains	3	22
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(899)	(708)
Debt Securities, Available-for-sale	8,424	8,296
Non-U.S. Agency Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	2,894	3,023
Securities, Available for sale Debt Securities, Gross Unrealized Gains	0	3
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(218)	(240)
Debt Securities, Available-for-sale	$ 2,676	$ 2,786

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