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Fair Value Measurements - Summary of Activity Related to Equity Investments (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 01, 2018	Dec. 31, 2017
Equity Investment [Roll Forward]
Non Current Other Assets	$ 4,518	$ 4,971
Equity Securities | Equity Investments with readily determinable value
Equity Investment [Roll Forward]
Carrying value, beginning of period	751
Changes in Fair Value Reflected in Net Income	(27)
Sales/ Purchases/Other	7
Carrying value, end of period	731
Non Current Other Assets	731
Equity Securities | Equity Investments without readily determinable value
Equity Investment [Roll Forward]
Carrying value, beginning of period	510
Changes in Fair Value Reflected in Net Income	(20)
Sales/ Purchases/Other	83
Carrying value, end of period	573
Non Current Other Assets	$ 573

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Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 325
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=75025870&loc=d3e40691-111596

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 325
-SubTopic 20
-Section 35
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=75027002&loc=d3e40346-111594

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Amount of addition (reduction) to the amount at which an instrument classified in shareholders' equity could be incurred (settled) in a current transaction between willing parties.

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Total debt and equity financial instruments including: (1) securities held-to-maturity and (2) securities available-for-sale that will be held for the long-term.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26626-111562

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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Amount of noncurrent assets classified as other.

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-Topic 210
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-Section S99
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