Balance Sheet Account Details - Summary of Changes in Goodwill (Details) - USD ($) $ in Millions |
12 Months Ended | |
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Dec. 31, 2017 |
Jan. 01, 2017 |
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| Goodwill Rollforward | ||
| Balance at beginning of period | $ 776 | $ 753 |
| Acquisitions | 23 | |
| GRAIL deconsolidation | (5) | |
| Balance at end of period | $ 771 | $ 776 |
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of increase (decrease) of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
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