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Investments (Short-Term and Long-Term Investments) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 39,669	$ 38,079
Securities, Available for sale Debt Securities, Gross Unrealized Gains	822	1,771
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(274)	(22)
Debt Securities, Available-for-sale	40,217	39,828
Held-to-maturity securities, Amortized Cost	641	638
Securities, Held to maturity, Unrecognized Holding Gain	4	9
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(2)	0
Debt Securities, Held-to-maturity, Fair Value	643	647
Total investments, Amortized Cost	40,310	38,717
Total investments, Gross Unrealized Gains	826	1,780
Total investments, Gross Unrealized Losses	(276)	(22)
Investments, Fair Value Disclosure	40,860	40,475
Debt Securities - held-to-maturity
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale	40,217	39,828
U.S. Government and Agency Obligations [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	3,206	3,335
Securities, Available for sale Debt Securities, Gross Unrealized Gains	23	133
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(31)	(3)
Debt Securities, Available-for-sale	3,198	3,465
Held-to-maturity securities, Amortized Cost	511	420
Securities, Held to maturity, Unrecognized Holding Gain	2	6
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(2)	0
Debt Securities, Held-to-maturity, Fair Value	511	426
State and Municipal Obligations [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	6,829	6,893
Securities, Available for sale Debt Securities, Gross Unrealized Gains	297	435
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(20)	0
Debt Securities, Available-for-sale	7,106	7,328
Held-to-maturity securities, Amortized Cost	30	31
Securities, Held to maturity, Unrecognized Holding Gain	2	2
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Debt Securities, Held-to-maturity, Fair Value	32	33
Corporate Obligations [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	20,947	18,886
Securities, Available for sale Debt Securities, Gross Unrealized Gains	372	863
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(145)	(12)
Debt Securities, Available-for-sale	21,174	19,737
Held-to-maturity securities, Amortized Cost	100	187
Securities, Held to maturity, Unrecognized Holding Gain	0	1
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Debt Securities, Held-to-maturity, Fair Value	100	188
U.S. Agency Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	5,868	6,849
Securities, Available for sale Debt Securities, Gross Unrealized Gains	88	245
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(55)	(3)
Debt Securities, Available-for-sale	5,901	7,091
Non-U.S. Agency Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	2,819	2,116
Securities, Available for sale Debt Securities, Gross Unrealized Gains	42	95
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(23)	(4)
Debt Securities, Available-for-sale	$ 2,838	$ 2,207

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