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Stockholders' Equity - Narrative- Share-based Compensation (Details) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2021 USD ($) employee | Aug. 31, 2020 employee | Jan. 02, 2022 USD ($) | Jan. 03, 2021 USD ($) | Dec. 29, 2019 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation expense, before taxes |  |  | $ 941 | $ 194 | $ 194
Research and development |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation expense, before taxes |  |  | 276 | 74 | 66
Selling, general and administrative |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation expense, before taxes |  |  | 638 | 95 | $ 105
GRAIL Inc |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based payment arrangement, accelerated cost |  |  | 615 |  |
Replacement Awards | GRAIL Inc |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based payment arrangement, accelerated cost |  |  | 615 |  |
Share-based compensation expense, before taxes |  |  | 24 |  |
Replacement Awards | GRAIL Inc | Research and development |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based payment arrangement, accelerated cost |  |  | 167 |  |
Replacement Awards | GRAIL Inc | Selling, general and administrative |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based payment arrangement, accelerated cost |  |  | $ 448 |  |
PSU |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share based compensation vesting performance period | 3 years | 3 years | 3 years |  |
Number of employees effected by modification | employee |  | 49 |  |  |
Incremental share-based compensation cost |  |  |  | $ 47 |
Performance Shares, Granted In 2019 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of employees effected by modification | employee | 52 |  |  |  |
Incremental share-based compensation cost | $ 41 |  |  |  |
Performance Shares, Granted In 2020 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of employees effected by modification | employee | 72 |  |  |  |
Incremental share-based compensation cost | $ 65 |  |  |  |

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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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