Amount of contribution received by defined benefit plan from employer which increases plan assets.

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Amount of cost for defined contribution plan.

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Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

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Amount of contributions made to multiemployer plan by employer.

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Amount of cost (reversal of cost) for pension benefits. Excludes other postretirement benefits.

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Percentage of employers matching contribution towards plan.

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Retirement Plans - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Apr. 30, 2018	Mar. 31, 2018	Apr. 01, 2017
Defined Benefit Plan Disclosure [Line Items]
Contribution to defined benefit and other post retirement plans		$ 10	$ 10
Company's contributions to plan		9	9
Defined Contribution Plan 401K [Member]
Defined Benefit Plan Disclosure [Line Items]
Company's contributions to plan		$ 13	$ 12
Defined Contribution Plan 401K [Member] \| Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Maximum Company matching contribution		4.00%
Defined Contribution Plan 401K [Member] \| First 3% of Participants Compensation [Member]
Defined Benefit Plan Disclosure [Line Items]
Matching contributions		100.00%
Participant's compensation for which company matches contribution		3.00%
Defined Contribution Plan 401K [Member] \| Next 2% of Participants Compensation [Member]
Defined Benefit Plan Disclosure [Line Items]
Matching contributions		50.00%
Participant's compensation for which company matches contribution		2.00%
Subsequent Event [Member]
Defined Benefit Plan Disclosure [Line Items]
Additional contribution to defined benefit and other post retirement plans	$ 25