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Changes in Equity and Redeemable Noncontrolling Interests - Additional Information (Detail) ¥ in Millions		9 Months Ended
	Sep. 27, 2018 USD ($)	Sep. 30, 2018 USD ($) shares	Sep. 30, 2018 CNY (¥) shares
Stockholders' Equity Note [Abstract]
Stock repurchase program, proposed aggregate value | $	$ 1,000,000,000
Stock repurchase program, period	12 months
Number of Class A ordinary shares repurchased | shares		207,165	207,165
Aggregate purchase price		$ 487,000,000	¥ 3,312

X

- Definition

Stock repurchase program proposed authorized amount.

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- Definition

Period which shares may be purchased under a stock repurchase plan authorized by an entity's Board of Directors, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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