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Investments (Short-Term and Long-Term Investments) (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 42,814	$ 39,669
Securities, Available for sale Debt Securities, Gross Unrealized Gains	33	822
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(2,843)	(274)
Debt Securities, Available-for-sale	40,004	40,217
Held-to-maturity securities, Amortized Cost	714	641
Securities, Held to maturity, Unrecognized Holding Gain	0	4
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(13)	(2)
Debt Securities, Held-to-maturity, Fair Value	701	643
Total debt securities, Amortized Cost	43,528	40,310
Total debt securities, Gross Unrealized Gains	33	826
Total debt securities, Gross Unrealized Losses	(2,856)	(276)
Debt securities, Fair Value Disclosure	40,705	40,860
Debt Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale	40,004	40,217
U.S. Government and Agency Obligations [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	3,808	3,206
Securities, Available for sale Debt Securities, Gross Unrealized Gains	1	23
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(209)	(31)
Debt Securities, Available-for-sale	3,600	3,198
Held-to-maturity securities, Amortized Cost	544	511
Securities, Held to maturity, Unrecognized Holding Gain	0	2
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(11)	(2)
Debt Securities, Held-to-maturity, Fair Value	533	511
State and Municipal Obligations [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	7,725	6,829
Securities, Available for sale Debt Securities, Gross Unrealized Gains	25	297
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(381)	(20)
Debt Securities, Available-for-sale	7,369	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	(2)	0
Debt Securities, Held-to-maturity, Fair Value	27	32
Corporate Obligations [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	22,080	20,947
Securities, Available for sale Debt Securities, Gross Unrealized Gains	5	372
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(1,515)	(145)
Debt Securities, Available-for-sale	20,570	21,174
Held-to-maturity securities, Amortized Cost	141	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	141	100
U.S. Agency Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	6,275	5,868
Securities, Available for sale Debt Securities, Gross Unrealized Gains	2	88
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(537)	(55)
Debt Securities, Available-for-sale	5,740	5,901
Non-U.S. Agency Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	2,926	2,819
Securities, Available for sale Debt Securities, Gross Unrealized Gains	0	42
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(201)	(23)
Debt Securities, Available-for-sale	$ 2,725	$ 2,838

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