Deposit On Land Use Right And Construction In Progress - Jewelry Park (Detail) - 9 months ended Sep. 30, 2015 ¥ in Millions, $ in Millions		USD ($)	[1]	CNY (¥)
Original Payment Commitment
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment amount				¥ 1,000
Revised Payment Commitment
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment amount		$ 164		1,000
October 2013 | Original Payment Commitment
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment amount	[2]			200
October 2013 | Revised Payment Commitment
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment amount		33	[2]	200
January 2014 | Original Payment Commitment
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment amount				50
January 2014 | Revised Payment Commitment
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment amount		8		50
June 2014 | Original Payment Commitment
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment amount				100
June 2014 | Revised Payment Commitment
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment amount		0		0
September 2014 | Original Payment Commitment
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment amount				150
September 2014 | Revised Payment Commitment
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment amount		3		20
November 2014 | Original Payment Commitment
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment amount				0
November 2014 | Revised Payment Commitment
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment amount		14		87
December 2014 | Original Payment Commitment
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment amount				0
December 2014 | Revised Payment Commitment
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment amount		6		35
January 2015 | Original Payment Commitment
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment amount	[3]			250
January 2015 | Revised Payment Commitment
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment amount		0	[3]	0
February 2015 | Original Payment Commitment
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment amount	[3]			0
February 2015 | Revised Payment Commitment
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment amount		5	[3]	28
April 2015 | Original Payment Commitment
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment amount				0
April 2015 | Revised Payment Commitment
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment amount		16		100
May 2015 | Original Payment Commitment
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment amount				0
May 2015 | Revised Payment Commitment
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment amount		0		0
June 2015 | Original Payment Commitment
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment amount				250
June 2015 | Revised Payment Commitment
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment amount		0		0
August 2015 | Original Payment Commitment
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment amount				0
August 2015 | Revised Payment Commitment
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment amount		0		0
September 2015 | Original Payment Commitment
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment amount				0
September 2015 | Revised Payment Commitment
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment amount		0		0
October 2015 | Original Payment Commitment
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment amount				0
October 2015 | Revised Payment Commitment
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment amount		0		0
November 2015 | Original Payment Commitment
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment amount				0
November 2015 | Revised Payment Commitment
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment amount		0		0
December 2015 | Original Payment Commitment
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment amount				0
December 2015 | Revised Payment Commitment
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment amount		0		0
January 2016 | Original Payment Commitment
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment amount	[3]			0
January 2016 | Revised Payment Commitment
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment amount		$ 79	[3]	¥ 480

[1] In US$ based on current exchange rates

[2] Includes initial deposit made to seller

[3] Updated to reflect delay to payment schedule