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Financial Instruments - Assets and Liabilities Measured on Recurring Basis - Footnotes (Detail) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Oct. 01, 2017 | Dec. 31, 2016
Footnotes to selected financial assets and liabilities: |  |
Gross unrealized gain | $ 406 |
Gross unrealized loss | $ 119 |
Fair Value, Measurements, Recurring [Member] |  |
Footnotes to selected financial assets and liabilities: |  |
Percentage of financial assets and liabilities measured at fair value inputs Level 1 and Level 3 inputs (less than) | 5.00% |
Trading equity funds | $ 274 | $ 236
Trading debt funds | 74 | 89
Trading securities held in trust | 63 | 71
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward-Exchange Contracts [Member] | Fair Value, Measurements, Recurring [Member] |  |
Footnotes to selected financial assets and liabilities: |  |
Instruments used as offsets (assets) | 40 | 162
Instruments used as offsets (liabilities) | 60 | 113
Not Designated as Hedging Instrument [Member] | Foreign Currency Swap [Member] | Fair Value, Measurements, Recurring [Member] |  |
Footnotes to selected financial assets and liabilities: |  |
Instruments used as offsets (liabilities) |  | 269
Level 2 [Member] | Estimate of Fair Value Measurement [Member] |  |
Footnotes to selected financial assets and liabilities: |  |
Fair value of long-term debt | 39,000 | $ 34,900
Foreign Currency Long Term Debt [Member] | Level 2 [Member] | Estimate of Fair Value Measurement [Member] |  |
Footnotes to selected financial assets and liabilities: |  |
Fair value of long-term debt | $ 4,700 |

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- Definition Amount of unrealized gain before deducting unrealized loss on investments in equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226000-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=82924980&loc=SL51823488-111719 + Details
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