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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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