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Basis of Presentation and Significant Accounting Policies - Additional Information (Details) $ / shares in Units, $ in Millions |  |  |  |  |  | 3 Months Ended | 12 Months Ended | 33 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 01, 2018 USD ($) Accounting_standard | Dec. 22, 2016 USD ($) | Sep. 28, 2016 USD ($) $ / shares | Jun. 24, 2016 USD ($) $ / shares | Apr. 08, 2016 USD ($) | Apr. 01, 2018 USD ($) | Dec. 31, 2018 USD ($) Operating_Segment | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2018 USD ($) Operating_Segment | Feb. 03, 2017 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of operating segments | Operating_Segment |  |  |  |  |  |  |  | 2 |  |  | 2 |
Number of accounting standards adopted | Accounting_standard |  | 11 |  |  |  |  |  |  |  |  |  |
Cash payments for acquisition, net of cash acquired | [1] |  |  |  |  |  |  | $ 0 | $ 1,000 | $ 18,368 |  |
Payments for merger termination costs |  |  |  |  |  | $ 150 |  |  |  | 150 |  |
Unrealized gain on equity securities |  |  |  |  |  |  |  | 477 |  |  |  |
Other income/(deductions)—net | [2] |  |  |  |  |  |  | (2,116) | (1,416) | (3,794) |  |
Decrease in cash, cash equivalents, restricted cash and cash equivalents | [1] |  |  |  |  |  |  | 205 | 1,235 | 1,041 |  |
Accruals for Medicare rebates, Medicaid and related state program rebates, performance-based contract rebates, chargebacks, sales allowances, cash discounts and sales returns |  |  |  |  |  |  |  | 5,426 | 4,923 |  | $ 5,426 |
Advertising expense |  |  |  |  |  |  |  | 3,100 | 3,100 | 3,200 |  |
Research and development expenses | [2],[3] |  |  |  |  |  |  | 8,006 | 7,683 | 7,892 |  |
Nonsoftware License Arrangement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Research and development expenses |  |  |  |  |  |  |  | 197 | 169 | 82 |  |
AstraZeneca [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  | $ 1,040 |  |  |  |  |  |  |  |  |
Payments to acquire businesses, cash portion |  |  | $ 555 |  |  |  |  |  | 605 |  |  |
Medivation [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, per share in cash (in dollars per share) | $ / shares |  |  |  | $ 81.5 |  |  |  |  |  |  |  |
Payments to acquire businesses, cash portion |  |  |  | $ 14,300 |  |  |  |  |  |  |  |
Cash payments for acquisition, net of cash acquired |  |  |  | $ 13,900 |  |  |  |  |  |  |  |
Anacor [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, per share in cash (in dollars per share) | $ / shares |  |  |  |  | $ 99.25 |  |  |  |  |  |  |
Payments to acquire businesses, cash portion |  |  |  |  | $ 4,900 |  |  |  |  |  |  |
Cash payments for acquisition, net of cash acquired |  |  |  |  | 4,500 |  |  |  |  |  |  |
Debt assumed |  |  |  |  | $ 698 |  |  |  |  |  |  |
ICU Medical [Member] | Disposed of by Sale, Not Discontinued Operations [Member] | HIS [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash received for disposition |  |  |  |  |  |  |  |  |  |  |  | $ 900
Sales Revenue, Product Line [Member] | Top Ten Products [Member] | Product Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk, amount |  |  |  |  |  |  |  | $ 1,000 |  |  |  |
Concentration risk, percentage |  |  |  |  |  |  |  | 51.00% |  |  |  |
Sales Revenue, Product Line [Member] | Top Nine Products [Member] | Product Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk, amount |  |  |  |  |  |  |  |  | $ 1,000 | $ 1,000 |  |
Concentration risk, percentage |  |  |  |  |  |  |  |  | 46.00% | 43.00% |  |
Financial Assets and Liabilities [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect on retained earnings, before tax |  | $ 462 |  |  |  |  |  |  |  |  |  |
Cumulative effect on retained earnings, net of tax |  | 419 |  |  |  |  |  |  |  |  |  |
Unrealized gain on equity securities |  |  |  |  |  |  |  | $ 477 |  |  |  |
Accounting for Hedging Activities [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Other income/(deductions)—net |  |  |  |  |  |  |  | 107 |  |  |  |
Restricted Cash [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Decrease in cash, cash equivalents, restricted cash and cash equivalents |  |  |  |  |  |  |  | 2 |  |  |  |
Reclassification From Financing Activities To Operating Activities [Member] | Cash Flow Classification [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Decrease in debt prepayment and extinguishment costs |  |  |  |  |  |  |  | 7 |  |  |  |
Reclassification From Operating Activities To Financing Activities [Member] | Cash Flow Classification [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Increase in accreted interest |  |  |  |  |  |  |  | $ 83 |  |  |  |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect on retained earnings, before tax |  | 584 |  |  |  |  | $ 584 |  |  |  |  |
Cumulative effect on retained earnings, net of tax |  | 450 |  |  |  |  |  |  |  |  |  |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Revenues [Member] | Collaboration Arrangements [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect on retained earnings, before tax |  | 500 |  |  |  |  |  |  |  |  |  |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Revenues [Member] | Collaboration Arrangements, Income From Upfront And Pre-Approval Milestone Payments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect on retained earnings, before tax |  | 394 |  |  |  |  |  |  |  |  |  |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Revenues [Member] | Collaboration Arrangements, Product Manufacturing [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect on retained earnings, before tax |  | 82 |  |  |  |  |  |  |  |  |  |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Revenues [Member] | Product Rights And Out-Licensing Arrangements [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect on retained earnings, before tax |  | 394 |  |  |  |  |  |  |  |  |  |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Revenues [Member] | Product Shipments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect on retained earnings, before tax |  | 84 |  |  |  |  |  |  |  |  |  |
Retained Earnings [Member] | Income Tax Accounting [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect on retained earnings, net of tax |  | (189) |  |  |  |  |  |  |  |  |  |
Retained Earnings [Member] | Reclassification of Certain Tax Effects from AOCI [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect on retained earnings, net of tax |  | $ 495 |  |  |  |  |  |  |  |  |  |
[1] | Amounts may not add due to rounding.
[2] | Amounts may not add due to rounding.
[3] | Exclusive of amortization of intangible assets, except as disclosed in Note 1L. Basis of Presentation and Significant Accounting Policies: Amortization of Intangible Assets, Depreciation and Certain Long-Lived Assets.

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