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Income Taxes - Summary of Activity Related to Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
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Jan. 03, 2021 | Dec. 29, 2019 | Dec. 30, 2018
Summary of unrecognized tax benefits |  |  |
Beginning of year | $ 3,853 | $ 3,326 | $ 3,151
Increases related to current year tax positions | 265 | 249 | 242
Increases related to prior period tax positions | 668 | 408 | 145
Decreases related to prior period tax positions | (551) | (105) | (137)
Settlements | (839) | (9) | (40)
Lapse of statute of limitations | (23) | (16) | (35)
End of year | $ 3,373 | $ 3,853 | $ 3,326

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=116821951&loc=SL37586934-109318 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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