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Income Taxes - Additional information (Detail) - USD ($) $ in Millions			3 Months Ended		12 Months Ended
	Sep. 28, 2018	Jan. 01, 2018	Jun. 30, 2018	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes
Income tax expense at U.S. federal statutory rate		21.00%			21.00%	35.00%	35.00%
Net reduction in income tax expense due to Tax Cuts and Jobs Act					$ (12)
Remeasurement of net deferred tax assets and liabilities due to tax					(7)
Mandatory transition tax due to tax legislation					(5)
Equity in net losses of unconsolidated entities					41	$ 68	$ 44
Other federal tax credits					10	13	14
Reduction in provision for income taxes due to tax audit settlements			$ 33		$ 40	2	11
Expected time of completion of IRS audits					15 months
Increase (decrease) to accruals and related deferred taxes					$ (35)	(5)	(10)
Deferred tax adjustment					(17)
Reduction in provision for income taxes due to state net operating losses and credits					22	12	10
Excess tax benefits associated with equity-based compensation				$ 32	17	37
Increase (decrease) in provision for income taxes due to impairments					(1)	(15)	(15)
Investments Qualifying for Federal Tax Credits [Member]
Income Taxes
Total consideration	$ 157
Payment to acquire investment	18
Equity in net losses of unconsolidated entities					30	30	31
Income tax (expense) benefit, including tax credits, from equity method investment					57	$ 51	$ 55
Capital Leases and Other [Member]
Income Taxes
Capital obligations					$ 250
Capital Leases and Other [Member] | Investments Qualifying for Federal Tax Credits [Member]
Income Taxes
Capital obligations	$ 139

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- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible impairment loss.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other tax credits.

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The increase (decrease) during the period in the amount due for taxes based on the reporting entity's earnings or attributable to the entity's income earning process (business presence) within a given jurisdiction.

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The fair value of notes issued in noncash investing and financing activities.

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The cash outflow associated with the acquisition of or advances to an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, and joint venture or equity method investment) or the acquisition of an additional interest in a subsidiary (controlled entity).

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Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement.

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Amount of income tax expense (benefit) from attributable to an adjustment of a deferred tax liability or asset due to internal analysis or other changes.

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Income tax expense (benefit), including federal tax credits, from equity method investment.

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Income Taxes [Line Items]

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Maximum number of months expected for IRS audits to be completed.

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Reduction in provision for income taxes due to state net operating loss and credit.

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Amount of income tax expense for remeasurement of deferred tax asset from change in tax rate pursuant to Tax Cuts and Jobs Act of 2017.

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Amount of income tax expense (benefit) from effect of Tax Cuts and Jobs Act of 2017.

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Amount of income tax expense from transition tax on accumulated earnings of controlled foreign corporation deemed repatriated pursuant to Tax Cuts and Jobs Act of 2017.

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