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Short-term and Long-term Investments, Restricted Deposits - Narrative (Details) $ in Millions	1 Months Ended		12 Months Ended
	Sep. 30, 2021 USD ($)	Jul. 31, 2021 USD ($)	Dec. 31, 2022 USD ($) position	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Debt Securities, Available-for-sale [Line Items]
Accrued interest income			$ 132	$ 96
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]			Other Assets, Current	Other Assets, Current
Positions from which gross unrealized losses were generated | position			6,423
Total investment positions | position			6,854
Gain on acquisition			$ (2)	$ (309)	$ 0
RxAdvance
Debt Securities, Available-for-sale [Line Items]
Impairment on equity method investment	$ 229
Circle Health
Debt Securities, Available-for-sale [Line Items]
Percentage of voting interests acquired		60.00%
Cash payments to acquire business		$ 705
Gain on acquisition				$ (309)
Consolidation percentage		100.00%
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Investments recorded at fair value that carry rating of AAA Plus, weighted average (in years)			4 years
Rated Securities | External Credit Rating, Investment Grade | Investment Securities
Debt Securities, Available-for-sale [Line Items]
Percentage of investments in rated securities carry an investment grade rating by nationally recognized statistical rating organizations			98.00%

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