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Investments (Short-Term and Long-Term Investments) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 47,010	$ 47,451
Securities, Available for sale Debt Securities, Gross Unrealized Gains	36	134
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(2,914)	(2,690)
Debt Securities, Available-for-sale	44,132	44,895
Held-to-maturity securities, Amortized Cost	597	603
Securities, Held to maturity, Unrecognized Holding Gain	0	1
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(8)	(8)
Debt Securities, Held-to-maturity, Fair Value	589	596
Debt Securities, Available-for-Sale and Held-to-Maturity, Fair Value	44,721	45,491
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Loss	(2,922)	(2,698)
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Gain	36	135
Debt Securities, Available-for-Sale and Held-to-Maturity, Amortized Cost	47,607	48,054
Debt Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale	44,132	44,895
U.S. Government and Agency Obligations [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	4,730	4,674
Securities, Available for sale Debt Securities, Gross Unrealized Gains	1	3
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(262)	(234)
Debt Securities, Available-for-sale	4,469	4,443
Held-to-maturity securities, Amortized Cost	510	506
Securities, Held to maturity, Unrecognized Holding Gain	0	1
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(5)	(6)
Debt Securities, Held-to-maturity, Fair Value	505	501
State and Municipal Obligations [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	7,228	7,636
Securities, Available for sale Debt Securities, Gross Unrealized Gains	7	39
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(357)	(322)
Debt Securities, Available-for-sale	6,878	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	22,756	23,136
Securities, Available for sale Debt Securities, Gross Unrealized Gains	20	67
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(1,225)	(1,186)
Debt Securities, Available-for-sale	21,551	22,017
Held-to-maturity securities, Amortized Cost	59	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	59	69
U.S. Agency Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	9,395	8,982
Securities, Available for sale Debt Securities, Gross Unrealized Gains	7	22
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(850)	(708)
Debt Securities, Available-for-sale	8,552	8,296
Non-U.S. Agency Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	2,901	3,023
Securities, Available for sale Debt Securities, Gross Unrealized Gains	1	3
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(220)	(240)
Debt Securities, Available-for-sale	$ 2,682	$ 2,786

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