Consolidated Condensed Balance Sheets (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Cash and cash equivalents ($254 and $229 attributable to VIEs)	$ 422	$ 717
Accounts receivable, net of allowance of $3 and $4	3	4
Restricted cash, current ($93 and $106 attributable to VIEs)	162	195
Property, plant and equipment, net ($4,260 and $4,342 attributable to VIEs)	13,147	13,190
Restricted cash, net of current portion ($47 and $48 attributable to VIEs)	48	49
Other assets ($172 and $164 attributable to VIEs)	391	385
Debt, current portion ($148 and $150 attributable to VIEs)	198	199
Debt, net of current portion ($3,168 and $3,242 attributable to VIEs)	$ 11,493	$ 11,083
Preferred Stock, Par or Stated Value Per Share	$ 0.001	$ 0.001
Preferred Stock, Shares Authorized	100,000,000	100,000,000
Preferred Stock, Shares Issued	0	0
Preferred Stock, Shares Outstanding	0	0
Common Stock, Par or Stated Value Per Share	$ 0.001	$ 0.001
Common Stock, Shares Authorized	1,400,000,000	1,400,000,000
Common Stock, Shares, Issued	504,252,268	502,287,022
Common Stock, Shares, Outstanding	361,150,393	381,921,264
Treasury Stock, Shares	143,101,875	120,365,758
Variable Interest Entity, Primary Beneficiary [Member]
Cash and cash equivalents ($254 and $229 attributable to VIEs)	$ 254	$ 229
Restricted cash, current ($93 and $106 attributable to VIEs)	93	106
Property, plant and equipment, net ($4,260 and $4,342 attributable to VIEs)	4,260	4,342
Restricted cash, net of current portion ($47 and $48 attributable to VIEs)	47	48
Other assets ($172 and $164 attributable to VIEs)	172	164
Debt, current portion ($148 and $150 attributable to VIEs)	148	150
Debt, net of current portion ($3,168 and $3,242 attributable to VIEs)	$ 3,168	$ 3,242