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Basis of Presentation and Significant Accounting Policies (Details) $ in Millions |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 01, 2018 USD ($) Accounting_standard | Sep. 30, 2018 USD ($) | Apr. 01, 2018 USD ($) | Oct. 01, 2017 USD ($) | Sep. 30, 2018 USD ($) Operating_Segment | Oct. 01, 2017 USD ($) | Dec. 31, 2017 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |  |  |  |  |
Number of business segments | Operating_Segment |  |  |  |  |  | 2 |  |
Number of accounting standards adopted | Accounting_standard |  | 11 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Net unrealized gains during the reporting period on equity securities still held at the reporting date | [1] |  | $ 40 |  |  | $ 370 |  |
Other income | [2] |  | 414 |  | $ (79) | 1,143 | $ (65) |
Net increase in cash, cash equivalents, restricted cash and restricted cash equivalents | [3] |  |  |  |  | 2,227 | $ 193 |
Accrued rebates and other accruals |  |  | 5,548 |  |  | 5,548 |  | $ 4,923
Financial Assets and Liabilities [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Cumulative effect adjustment to retained earnings, pre-tax |  | $ 462 |  |  |  |  |  |
Cumulative effect adjustment to retained earnings, after-tax |  | 419 |  |  |  |  |  |
Net unrealized gains during the reporting period on equity securities still held at the reporting date |  |  | 8 |  |  | 344 |  |
Accounting for Hedging Activities [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Other income |  |  | $ 23 |  |  | 68 |  |
Restricted Cash in the Statement of Cash Flows [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Net increase in cash, cash equivalents, restricted cash and restricted cash equivalents |  |  |  |  |  | 10 |  |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Revenues [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Cumulative effect adjustment to retained earnings, pre-tax |  | 584 |  | $ 584 |  |  |  |
Cumulative effect adjustment to retained earnings, after-tax |  | 450 |  |  |  |  |  |
Reclassification From Financing Activities To Operating Activities [Member] | Classification of Certain Transactions in the Statement of Cash Flows [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Debt prepayment and extinguishment costs |  |  |  |  |  | (7) |  |
Reclassification From Operating Activities To Financing Activities [Member] | Classification of Certain Transactions in the Statement of Cash Flows [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Accreted interest |  |  |  |  |  | $ 69 |  |
Collaboration Arrangements [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Revenues [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Cumulative effect adjustment to retained earnings, pre-tax |  | 500 |  |  |  |  |  |
Collaboration Arrangements, Income From Upfront And Pre-Approval Milestone Payments [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Revenues [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Cumulative effect adjustment to retained earnings, pre-tax |  | 394 |  |  |  |  |  |
Collaboration Arrangements, Product Manufacturing [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Revenues [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Cumulative effect adjustment to retained earnings, pre-tax |  | 82 |  |  |  |  |  |
Product Rights And Out-Licensing Arrangements [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Revenues [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Cumulative effect adjustment to retained earnings, pre-tax |  | 394 |  |  |  |  |  |
Product Shipments [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Revenues [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Cumulative effect adjustment to retained earnings, pre-tax |  | 84 |  |  |  |  |  |
Sales Revenue, Product Line [Member] | Product Concentration Risk [Member] | Top Nine Products [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Concentration risk, amount |  |  |  |  |  |  |  | $ 1,000
Concentration risk, percentage |  |  |  |  |  |  |  | 46.00%
Retained Earnings [Member] | Income Tax Accounting [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Cumulative effect adjustment to retained earnings, after-tax |  | (189) |  |  |  |  |  |
Retained Earnings [Member] | Reclassification of Certain Tax Effects from AOCI [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Cumulative effect adjustment to retained earnings, after-tax |  | $ 495 |  |  |  |  |  |
[1] | The third quarter of 2018 includes $8 million of unrealized net gains in Other (income)/deductions––net reflecting the adoption of a new accounting standard in the first quarter of 2018 and $32 million of unrealized gains on other equity securities. The first nine months of 2018 includes $344 million of unrealized net gains in Other (income)/deductions––net reflecting the adoption of a new accounting standard in the first quarter of 2018 and $26 million of unrealized gains on other equity securities. For additional information, see Note 1B and Note 4.
[2] | Amounts may not add due to rounding.
[3] | Amounts may not add due to rounding.

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