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Investments (Short-Term and Long-Term Investments) (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 43,697	$ 39,669
Securities, Available for sale Debt Securities, Gross Unrealized Gains	4	822
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(4,147)	(274)
Debt Securities, Available-for-sale	39,554	40,217
Held-to-maturity securities, Amortized Cost	641	641
Securities, Held to maturity, Unrecognized Holding Gain	0	4
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(20)	(2)
Debt Securities, Held-to-maturity, Fair Value	621	643
Total debt securities, Amortized Cost	44,338	40,310
Total debt securities, Gross Unrealized Gains	4	826
Total debt securities, Gross Unrealized Losses	(4,167)	(276)
Debt securities, Fair Value Disclosure	40,175	40,860
Debt Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale	39,554	40,217
U.S. Government and Agency Obligations [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	3,752	3,206
Securities, Available for sale Debt Securities, Gross Unrealized Gains	0	23
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(299)	(31)
Debt Securities, Available-for-sale	3,453	3,198
Held-to-maturity securities, Amortized Cost	538	511
Securities, Held to maturity, Unrecognized Holding Gain	0	2
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(16)	(2)
Debt Securities, Held-to-maturity, Fair Value	522	511
State and Municipal Obligations [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	7,380	6,829
Securities, Available for sale Debt Securities, Gross Unrealized Gains	2	297
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(621)	(20)
Debt Securities, Available-for-sale	6,761	7,106
Held-to-maturity securities, Amortized Cost	29	30
Securities, Held to maturity, Unrecognized Holding Gain	0	2
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(4)	0
Debt Securities, Held-to-maturity, Fair Value	25	32
Corporate Obligations [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	22,533	20,947
Securities, Available for sale Debt Securities, Gross Unrealized Gains	1	372
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(2,057)	(145)
Debt Securities, Available-for-sale	20,477	21,174
Held-to-maturity securities, Amortized Cost	74	100
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	74	100
U.S. Agency Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	6,868	5,868
Securities, Available for sale Debt Securities, Gross Unrealized Gains	1	88
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(875)	(55)
Debt Securities, Available-for-sale	5,994	5,901
Non-U.S. Agency Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	3,164	2,819
Securities, Available for sale Debt Securities, Gross Unrealized Gains	0	42
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(295)	(23)
Debt Securities, Available-for-sale	$ 2,869	$ 2,838

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