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Pending Acquisition (Details) In Millions, except Share data, unless otherwise specified	Aug. 12, 2013 USD ($)	Aug. 12, 2013 Share purchase agreement USD ($)	Aug. 12, 2013 Share purchase agreement CNY	Aug. 12, 2013 Share subscription agreement
Pending Acquisition Agreement [Line Items]
Agreement purchase price		$ 553	3,400
Expected equity ownership percentage	51.00%	29.51%	29.51%
Expected shares to be acquired		157,245,200	157,245,200	233,639,000
Breakup fee	$ 20