Summary of Significant Accounting Policies - Narrative (Details) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 29, 2019 USD ($)	Sep. 29, 2019 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Weighted average remaining lease term	5 years 9 months 18 days	5 years 9 months 18 days
Weighted average discount rate	3.00%	3.00%
Operating lease costs	$ 103	$ 227
Operating lease payments	$ 86	$ 233
Minimum | Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease, term of contract	1 year	1 year
Maximum | Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease, term of contract	55 years	55 years