Consolidated Condensed Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Cash and cash equivalents ($296 and $229 attributable to VIEs)	$ 796	$ 717
Accounts receivable, net of allowance of $5 and $4	5	4
Restricted cash, current ($99 and $106 attributable to VIEs)	162	195
Property, plant and equipment, net ($4,300 and $4,342 attributable to VIEs)	13,178	13,190
Restricted cash, net of current portion ($46 and $48 attributable to VIEs)	47	49
Other assets ($161 and $164 attributable to VIEs)	386	385
Debt, current portion ($146 and $150 attributable to VIEs)	197	199
Debt, net of current portion ($3,199 and $3,242 attributable to VIEs)	11,520	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	504,015,575	502,287,022
Common Stock, Shares, Outstanding	373,837,359	381,921,264
Treasury Stock, Shares	130,178,216	120,365,758
Variable Interest Entity, Primary Beneficiary [Member]
Cash and cash equivalents ($296 and $229 attributable to VIEs)	296	229
Restricted cash, current ($99 and $106 attributable to VIEs)	99	106
Property, plant and equipment, net ($4,300 and $4,342 attributable to VIEs)	4,300	4,342
Restricted cash, net of current portion ($46 and $48 attributable to VIEs)	46	48
Other assets ($161 and $164 attributable to VIEs)	161	164
Debt, current portion ($146 and $150 attributable to VIEs)	146	150
Debt, net of current portion ($3,199 and $3,242 attributable to VIEs)	$ 3,199	$ 3,242