Debt (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Total debt	$ 2,315	$ 2,309
Current portion of long-term debt	63	4
Six Point Three Percent Senior Notes due Two Thousand Sixteen [Member]
Debt Instrument [Line Items]
Total debt	500	500
Stated interest rate of debt instrument	6.30%	6.30%
Seven Point Seven Five Percent Senior Notes due Two Thousand Eighteen [Member]
Debt Instrument [Line Items]
Total debt	500	499
Stated interest rate of debt instrument	7.75%	7.75%
Seven Point Eight Seven Five Percent Senior Notes due Two Thousand Twenty [Member]
Debt Instrument [Line Items]
Total debt	249	248
Stated interest rate of debt instrument	7.875%	7.875%
Eight Point Three Seven Five Percent Senior Notes due Two Thousand Eighteen [Member]
Debt Instrument [Line Items]
Total debt	350	350
Stated interest rate of debt instrument	8.375%	8.375%
Nine Point Seven Five Percent Senior Notes due Two Thousand Fourteen Net of Discount [Member]
Debt Instrument [Line Items]
Total debt	59	59
Stated interest rate of debt instrument	9.75%	9.75%
Ten Percent Convertible Senior Notes due Two Thousand Eighteen [Member]
Debt Instrument [Line Items]
Total debt	386	385
Stated interest rate of debt instrument	10.00%	10.00%
Ship Mortgage Facility [Member]
Debt Instrument [Line Items]
Total debt	25	29
Current portion of long-term debt	4	4
Oman Credit Facilities [Member]
Debt Instrument [Line Items]
Total debt	7	0
Industrial Revenue Bonds [Member]
Debt Instrument [Line Items]
Total debt	$ 239	$ 239