Line items represent reporting concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
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-Article 12
-Section 12
-Sentence Column A

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Amount of unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in net income (trading).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (e)
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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 45
-Paragraph 1A
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Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
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Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Investments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
Investments (Details) - USD ($) $ in Millions	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018	Dec. 31, 2018
Investments
Fair Value	$ 1,440		$ 1,440		$ 1,336
Total trading short-term investments	1,440		1,440		1,336
Change in unrealized gains (losses) on trading securities	38	$ (2)	126	$ (24)
Domestic equity securities
Investments
Fair Value Equity	689		689		632
Domestic debt securities
Investments
Fair Value	392		392		268
Foreign equity securities
Investments
Fair Value Equity	195		195		218
Foreign equity securities \| Denominated in foreign currencies
Investments
Fair Value Equity	59		59		66
Foreign equity securities \| Denominated in Euros
Investments
Fair Value Equity	29		29		25
Foreign equity securities \| Denominated in Japanese Yen
Investments
Fair Value Equity	11		11		20
Foreign equity securities \| Denominated in British pounds
Investments
Fair Value Equity	9		9		9
Foreign equity securities \| Denominated in Swiss Franc
Investments
Fair Value Equity	4		4		3
Foreign equity securities \| Denominated in other foreign currencies
Investments
Fair Value Equity	6		6		9
High yield securities
Investments
Fair Value	57		57		19
Foreign debt securities
Investments
Fair Value	49		49		16
Collateralized loan obligation
Investments
Fair Value	27		27		28
Money market funds held in trading accounts
Investments
Fair Value	21		21		146
Money market funds held in trading accounts \| Denominated in foreign currencies
Investments
Fair Value	1		1		10
Term deposits
Investments
Fair Value	5		5		$ 9
Other trading securities
Investments
Fair Value	$ 5		$ 5