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Debt (Tables)
 6 Months Ended
Jun. 30, 2021
Line of Credit Facility [Line Items]  
Schedule of Short-term Debt
As of
June 30,
2021		As of
December 31,
2020
(In $ millions)
Short-Term Borrowings and Current Installments of Long-Term Debt - Third Party and Affiliates
Current installments of long-term debt30 431 
Short-term borrowings, including amounts due to affiliates(1)
70 65 
Revolving credit facility(2)
400 — 
Total500 496 
______________________________
(1)The weighted average interest rate was 0.2% and 0.6% as of June 30, 2021 and December 31, 2020, respectively.
(2)The weighted average interest rate was 1.6% and 0.0% as of June 30, 2021 and December 31, 2020, respectively.
Schedule of Long-term Debt
As of
June 30,
2021		As of
December 31,
2020
(In $ millions)
Long-Term Debt
Senior unsecured notes due 2021, interest rate of 5.875%
— 400 
Senior unsecured notes due 2022, interest rate of 4.625%
500 500 
Senior unsecured notes due 2023, interest rate of 1.125%
890 919 
Senior unsecured notes due 2024, interest rate of 3.500%
499 499 
Senior unsecured notes due 2025, interest rate of 1.250%
356 368 
Senior unsecured notes due 2027, interest rate of 2.125%
591 610 
Pollution control and industrial revenue bonds due at various dates through 2030, interest rates ranging from 4.05% to 5.00%
166 166 
Bank loans due at various dates through 2026(1)
7 8 
Obligations under finance leases due at various dates through 2054188 201 
Subtotal3,197 3,671 
Unamortized debt issuance costs(2)
(11)(13)
Current installments of long-term debt(30)(431)
Total3,156 3,227 
______________________________
(1)The weighted average interest rate was 1.3% and 1.3% as of June 30, 2021 and December 31, 2020, respectively.
(2)Related to the Company's long-term debt, excluding obligations under finance leases.
Revolving Credit Facility [Member]  
Line of Credit Facility [Line Items]  
Schedule of Balances Available for Borrowing
The Company's debt balances and amounts available for borrowing under its senior unsecured revolving credit facility are as follows:
As of
June 30,
2021
(In $ millions)
Revolving Credit Facility
Borrowings outstanding(1)
400 
Available for borrowing(2)
850 
______________________________
(1)The Company borrowed $400 million under its senior unsecured revolving credit facility to repay the 5.875% senior unsecured notes due June 15, 2021, which matured during the six months ended June 30, 2021.
(2)The margin for borrowings under the senior unsecured revolving credit facility was 1.5% above LIBOR or EURIBOR at current Company credit ratings.