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Investments (Short-Term and Long-Term Investments) (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 41,321	$ 39,669
Securities, Available for sale Debt Securities, Gross Unrealized Gains	125	822
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(1,603)	(274)
Debt Securities, Available-for-sale	39,843	40,217
Held-to-maturity securities, Amortized Cost	626	641
Securities, Held to maturity, Unrecognized Holding Gain	1	4
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(9)	(2)
Debt Securities, Held-to-maturity, Fair Value	618	643
Total debt securities, Amortized Cost	41,947	40,310
Total debt securities, Gross Unrealized Gains	126	826
Total debt securities, Gross Unrealized Losses	(1,612)	(276)
Debt securities, Fair Value Disclosure	40,461	40,860
Debt Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale	39,843	40,217
U.S. Government and Agency Obligations [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	3,507	3,206
Securities, Available for sale Debt Securities, Gross Unrealized Gains	4	23
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(140)	(31)
Debt Securities, Available-for-sale	3,371	3,198
Held-to-maturity securities, Amortized Cost	510	511
Securities, Held to maturity, Unrecognized Holding Gain	1	2
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(9)	(2)
Debt Securities, Held-to-maturity, Fair Value	502	511
State and Municipal Obligations [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	7,022	6,829
Securities, Available for sale Debt Securities, Gross Unrealized Gains	57	297
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(224)	(20)
Debt Securities, Available-for-sale	6,855	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	0	0
Debt Securities, Held-to-maturity, Fair Value	29	32
Corporate Obligations [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	21,669	20,947
Securities, Available for sale Debt Securities, Gross Unrealized Gains	55	372
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(811)	(145)
Debt Securities, Available-for-sale	20,913	21,174
Held-to-maturity securities, Amortized Cost	87	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	87	100
U.S. Agency Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	6,210	5,868
Securities, Available for sale Debt Securities, Gross Unrealized Gains	7	88
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(316)	(55)
Debt Securities, Available-for-sale	5,901	5,901
Non-U.S. Agency Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	2,913	2,819
Securities, Available for sale Debt Securities, Gross Unrealized Gains	2	42
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(112)	(23)
Debt Securities, Available-for-sale	$ 2,803	$ 2,838

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