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Basis of Presentation, Uses of Estimates and Significant Accounting Policies (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 USD ($) | Jan. 01, 2020 | Dec. 31, 2019 USD ($)
Accounts Receivable, after Allowance for Credit Loss, Current | $ 12,870 |  | $ 11,822
Other current receivables | 12,534 |  | 9,640
Goodwill, Impairment Loss | 0 |  |
Impairment of Intangible Assets (Excluding Goodwill) | 0 |  |
Other Liabilities, Current | $ 20,392 |  | 14,595
Number Of Days Notice Required To Cancel Health Insurance Contract | 30 |  |
Healthcare Sector [Member] |  |  |
Health Insurance Industry Tax | $ 3,000 |  |
Other Current Liabilities [Member] |  |  |
Health savings account deposits | $ 10,200 |  | 8,300
Restricted Stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 4 years |  |
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 |  |
Employee Stock Purchase Plan (ESPP) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date | 10.00% |  |
Accounting Standards Update 2016-13 |  |  |
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] |  | true |
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 | $ 5,300 |  | 4,300
Pharmaceutical Manufacturer Rebates Receivable [Member] |  |  |
Other current receivables | 6,300 |  | 4,700
Medicare Part D Receivables [Member] |  |  |
Other current receivables | $ 2,900 |  | $ 2,300

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