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Financial Instruments and Risk Concentration (Details)	12 Months Ended
	Dec. 31, 2020	Oct. 31, 2020	Jan. 31, 2017
Customer Concentration Risk | Accounts Receivable | Saudi Arabia
Percentage	25.00%
Customer Concentration Risk | Accounts Receivable | Mexico
Percentage	21.00%
5.00% senior notes due September 2020
Debt Instrument, Interest Rate, Stated Percentage	5.00%
4.625% senior notes due September 2021
Debt Instrument, Interest Rate, Stated Percentage	4.625%
5.50% senior notes due January 2023
Debt Instrument, Interest Rate, Stated Percentage	5.50%
5.10% senior notes due September 2023
Debt Instrument, Interest Rate, Stated Percentage	5.10%
5.75% senior notes due February 2025
Debt Instrument, Interest Rate, Stated Percentage	5.75%
0.75% senior exchangeable notes due January 2024
Debt Instrument, Interest Rate, Stated Percentage	0.75%		0.75%
7.25% senior guaranteed notes due January 2026
Debt Instrument, Interest Rate, Stated Percentage	7.25%
7.50% senior guaranteed notes due January 2028
Debt Instrument, Interest Rate, Stated Percentage	7.50%
6.50% senior priority guaranteed notes due February 2025
Debt Instrument, Interest Rate, Stated Percentage	6.50%	6.50%
9.00% senior priority guaranteed notes due February 2025
Debt Instrument, Interest Rate, Stated Percentage	9.00%	9.00%

X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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