Income Taxes - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended		12 Months Ended
	Mar. 04, 2019	Dec. 31, 2017	Sep. 29, 2019	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Deferred tax asset, write off		$ 2,000
Remeasurement of deferred tax asset						$ 2,000
Effect of change on earnings per share (in dollars per share)						$ 6.77
Total net state income tax expense					$ 96	$ 83	$ 103
Foreign derived intangible income deduction					(122)	(61)	0
Foreign derived intangible income deduction related to prior year	$ 75		$ 62	$ 65	98
Deduction for foreign derived intangible income enacted by the Tax Act, current and prior year					(220)	(61)
Recognized tax benefit					15	61	0
Unrecognized tax benefits		$ 0			0	0	0
Federal and foreign income tax payments made, net of refunds received					$ 940	$ (41)	$ 1,100