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Fair Value (Details) - USD ($) $ in Millions | Jul. 04, 2021 | Dec. 31, 2020
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Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Financial assets (liabilities) |  |
Cash and equivalents | $ 0 | $ 17
Available-for-sale debt securities | 0 | 0
Equity securities | 60 | 58
Other investments | 0 | 0
Cash flow hedges | 0 | 0
Short- and long-term debt principal | 0 | 0
Significant Other Observable Inputs (Level 2) |  |
Financial assets (liabilities) |  |
Cash and equivalents | 3 | 2
Available-for-sale debt securities | 140 | 134
Equity securities | 0 | 0
Other investments | 0 | 0
Cash flow hedges | 368 | 419
Short- and long-term debt principal | (15,569) | (14,606)
Significant Unobservable Inputs (Level 3) |  |
Financial assets (liabilities) |  |
Cash and equivalents | 0 | 0
Available-for-sale debt securities | 0 | 0
Equity securities | 0 | 0
Other investments | 9 | 9
Cash flow hedges | 0 | 0
Short- and long-term debt principal | 0 | 0
Carrying Value |  |
Financial assets (liabilities) |  |
Cash and equivalents | 3 | 19
Available-for-sale debt securities | 140 | 134
Equity securities | 60 | 58
Other investments | 9 | 9
Cash flow hedges | 368 | 419
Short- and long-term debt principal | (14,428) | (13,117)
Fair Value |  |
Financial assets (liabilities) |  |
Cash and equivalents | 3 | 19
Available-for-sale debt securities | 140 | 134
Equity securities | 60 | 58
Other investments | 9 | 9
Cash flow hedges | 368 | 419
Short- and long-term debt principal | $ (15,569) | $ (14,606)

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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