Fair Value of Financial Assets and Liabilities - Summary of Financial Instruments (Details) - USD ($) $ in Millions	Sep. 29, 2019	Dec. 31, 2018
Liabilities:
Current portion of long-term debt	$ (1,142)	$ (1,107)
Long-term debt	(7,363)	(6,247)
Reported Value Measurement [Member] \| Level 3
Assets:
Notes hedges	88	24
Liabilities:
Notes Embedded Conversion Derivative	(88)	(24)
Reported Value Measurement [Member] \| Level 2
Assets:
Other financial assets	49	32
Derivative instruments – assets	3	6
Liabilities:
Current portion of long-term debt	0	(2)
Long-term debt	(7,363)	(6,222)
Other long-term debt	0	(25)
Derivative instruments – liabilities	(15)	(2)
Reported Value Measurement [Member] \| Money market funds \| Level 1
Assets:
Money market funds	2,372	1,906
Reported Value Measurement [Member] \| Short-term debt (2019 Cash Convertible Senior Notes) \| Level 2
Liabilities:
Current portion of long-term debt	(1,142)	(1,105)
Estimate of Fair Value Measurement [Member] \| Level 3
Assets:
Notes hedges	88	24
Liabilities:
Notes Embedded Conversion Derivative	(88)	(24)
Estimate of Fair Value Measurement [Member] \| Level 2
Assets:
Other financial assets	49	32
Derivative instruments – assets	3	6
Liabilities:
Current portion of long-term debt	0	(2)
Long-term debt	(7,874)	(6,191)
Other long-term debt	0	(25)
Derivative instruments – liabilities	(15)	(2)
Estimate of Fair Value Measurement [Member] \| Money market funds \| Level 1
Assets:
Money market funds	2,372	1,906
Estimate of Fair Value Measurement [Member] \| Short-term debt (2019 Cash Convertible Senior Notes) \| Level 2
Liabilities:
Current portion of long-term debt	$ (1,232)	$ (1,327)

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Fair value of all derivative assets designated as fair value hedging instruments.

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