Segment, Geographic and Other Revenue Information (Detail) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|
Sep. 27, 2020 |
Sep. 29, 2019 |
Sep. 27, 2020 |
Sep. 29, 2019 |
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| Segment Reporting Information [Line Items] | ||||||||
| Revenues | $ 12,131 | $ 12,680 | $ 35,961 | $ 39,062 | ||||
| Earnings | [1] | 2,176 | 10,727 | 10,014 | 19,190 | |||
| Operating Segments [Member] | ||||||||
| Segment Reporting Information [Line Items] | ||||||||
| Revenues | 12,131 | 12,303 | 35,961 | 36,964 | ||||
| Earnings | [1] | 7,816 | 7,890 | 23,554 | 24,096 | |||
| Segment Reconciling Items [Member] | ||||||||
| Segment Reporting Information [Line Items] | ||||||||
| Revenues | 0 | 377 | 0 | 2,098 | ||||
| Earnings | [1] | (1,939) | (1,469) | (4,958) | (3,776) | |||
| Segment Reconciling Items [Member] | Purchase Accounting Adjustments [Member] | ||||||||
| Segment Reporting Information [Line Items] | ||||||||
| Revenues | 0 | 0 | 0 | 0 | ||||
| Earnings | [1] | (823) | (1,141) | (2,545) | (3,357) | |||
| Segment Reconciling Items [Member] | Acquisition-Related Costs [Member] | ||||||||
| Segment Reporting Information [Line Items] | ||||||||
| Revenues | 0 | 0 | 0 | 0 | ||||
| Earnings | [1] | (11) | (300) | (46) | (152) | |||
| Segment Reconciling Items [Member] | Certain Significant Items [Member] | ||||||||
| Segment Reporting Information [Line Items] | ||||||||
| Revenues | [2] | 0 | 0 | 0 | 0 | |||
| Earnings | [1],[2] | (1,675) | 7,187 | (2,554) | 6,495 | |||
| Corporate and other unallocated [Member] | ||||||||
| Segment Reporting Information [Line Items] | ||||||||
| Revenues | 0 | 0 | 0 | 0 | ||||
| Earnings | [1] | (1,192) | (1,439) | (3,437) | (4,116) | |||
| Biopharma [Member] | ||||||||
| Segment Reporting Information [Line Items] | ||||||||
| Revenues | 10,215 | 9,952 | 30,017 | 28,429 | ||||
| Biopharma [Member] | Operating Segments [Member] | ||||||||
| Segment Reporting Information [Line Items] | ||||||||
| Revenues | 10,215 | 9,952 | 30,017 | 28,429 | ||||
| Earnings | [1] | 6,807 | 6,506 | 20,186 | 18,461 | |||
| Upjohn [Member] | Operating Segments [Member] | ||||||||
| Segment Reporting Information [Line Items] | ||||||||
| Revenues | 1,916 | 2,351 | 5,944 | 8,535 | ||||
| Earnings | [1] | $ 1,009 | $ 1,384 | $ 3,367 | $ 5,635 | |||
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