Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Millions		6 Months Ended
		Jun. 28, 2020	Jan. 01, 2020	Jan. 01, 2019
New Accounting Pronouncements
Length of fiscal quarters, weeks		91 days
ASU 2016-13 - Credit Losses (Topic 326)
New Accounting Pronouncements
Cumulative effect of adoption of new accounting pronouncement	[1]			$ 37
ASU 2016-13 - Credit Losses (Topic 326) | Retained Earnings
New Accounting Pronouncements
Cumulative effect of adoption of new accounting pronouncement			$ 37	$ 37	[1]

[1] Reflects the cumulative effect of Accounting Standards Update (ASU) 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, which we adopted on January 1, 2020. See Note A for additional details.