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Basis of Presentation, Uses of Estimates and Significant Accounting Policies (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Accounts Receivable, after Allowance for Credit Loss, Current	$ 14,216	$ 12,870
Other current receivables	13,866	12,534
Accounts payable and accrued liabilities	24,643	22,495
Other Liabilities, Current	$ 22,975	20,392
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
Other Current Liabilities [Member]
Health savings account deposits	$ 11,400	10,200
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	$ 5,400	5,300
Pharmaceutical Manufacturer Rebates Receivable [Member]
Other current receivables	7,200	6,300
Medicare Part D Receivables [Member]
Other current receivables	$ 3,400	$ 2,900

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