Income Taxes - Quarter information (Detail) - USD ($) $ in Millions		1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 28, 2018	Sep. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Income Taxes
Effective tax rate of income (loss) before income taxes			16.60%	35.70%	18.90%	34.90%
Income tax expense at U.S. federal statutory rate					21.00%		35.00%
Net reduction in income tax expense due to Tax Cuts and Jobs Act		$ (12)
Re-measurement of net deferred tax assets and liabilities due to tax legislation		(7)
Mandatory transition tax due to tax legislation		$ (5)
Increase (decrease) to accruals and related deferred taxes			$ (27)	$ (15)	$ (35)	$ (15)
Equity in net losses of unconsolidated entities			9	8	29	53
Tax audit increase (decrease)			(2)		(35)
Investments Qualifying for Federal Tax Credits [Member]
Income Taxes
Total consideration	$ 157
Payment to acquire investment	18
Equity in net losses of unconsolidated entities			5	6	17	21
Income tax (expense) benefit, including tax credits, from equity method investment			$ 18	$ 14	40	$ 39
Investments Qualifying for Federal Tax Credits [Member] | Capital Leases and Other [Member]
Income Taxes
Capital obligations	$ 139				$ 139