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Basis of Presentation, Uses of Estimates and Significant Accounting Policies (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accounts Receivable, after Allowance for Credit Loss, Current	$ 17,681	$ 14,216
Revenue, Remaining Performance Obligation, Amount	12,500
Other current receivables	12,769	13,866
Inventory, Net	$ 3,500	2,900
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Other Liabilities
Accounts payable and accrued liabilities	$ 27,715	24,643
Other Liabilities, Current	$ 26,281	22,975
Number Of Days Notice Required To Cancel Health Insurance Contract	30 days
Goodwill, Impairment Loss	$ 0	0	$ 0
Impairment of Intangible Assets (Excluding Goodwill)	$ 0	0	$ 0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Percentage	50.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	3 years
Other Current Liabilities [Member]
Health savings account deposits	$ 13,500	11,400
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years
Employee Stock Purchase Plan (ESPP) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date	10.00%
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years
Share-based Compensation Arrangement by Share-based Payment Plan Award, Options, Award Exercisable Period	10 years
Health Insurance Product Line [Member]
Short-duration Insurance Contracts, Historical Claims Duration, First 90 Days	0.90
Products and services [Member]
Accounts Receivable, after Allowance for Credit Loss, Current	$ 7,100	5,400
Pharmaceutical Manufacturer Rebates Receivable [Member]
Other current receivables	8,200	7,200
Medicare Part D Receivables [Member]
Other current receivables	$ 1,300	$ 3,400

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