Other (Income)/Deductions - Net - Schedule of Other Nonoperating Income (Expense) (Details) - USD ($) $ in Millions |
12 Months Ended | ||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
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| Other Income and Expenses [Abstract] | |||||||||||||||||||||||||
| Interest income | $ (73) | $ (225) | $ (333) | ||||||||||||||||||||||
| Interest expense | [1] | 1,449 | 1,573 | 1,316 | |||||||||||||||||||||
| Net interest expense | 1,376 | 1,348 | 983 | ||||||||||||||||||||||
| Royalty-related income | (770) | (646) | (485) | ||||||||||||||||||||||
| Net (gains)/losses on asset disposals | 237 | (32) | (71) | ||||||||||||||||||||||
| Net (gains)/losses recognized during the period on equity securities | [2],[3] | (540) | (454) | (586) | |||||||||||||||||||||
| Net realized (gains)/losses on sales of investments in debt securities | [4] | 0 | 0 | 141 | |||||||||||||||||||||
| Income from collaborations, out-licensing arrangements and sales of compound/product rights | [5] | (326) | (168) | (476) | |||||||||||||||||||||
| Net periodic benefit costs/(credits) other than service costs | [6] | (236) | 72 | (270) | |||||||||||||||||||||
| Certain legal matters, net | [7] | 28 | 292 | 84 | |||||||||||||||||||||
| Certain asset impairments | [8] | 1,691 | 2,843 | 3,115 | |||||||||||||||||||||
| Business and legal entity alignment costs | [9] | 0 | 300 | 63 | |||||||||||||||||||||
| Consumer Healthcare JV equity method (income)/loss | [10] | (298) | (17) | 0 | |||||||||||||||||||||
| Other, net | [11] | (493) | (226) | (421) | |||||||||||||||||||||
| Other (income)/deductions––net | $ 669 | $ 3,314 | $ 2,077 | ||||||||||||||||||||||
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