v3.26.1
Debt - Schedule of China Credit Facilities (Details)
¥ in Millions, $ in Millions
1 Months Ended
Apr. 30, 2025
CNY (¥)
Jun. 30, 2026
USD ($)
Jun. 30, 2026
CNY (¥)
China Credit Facilities      
Debt Instrument [Line Items]      
Revolving credit facilities(2)   $ 614 ¥ 4,172
China Credit Facilities | CSIT Revolving Credit Agreement      
Debt Instrument [Line Items]      
Line of credit facility, maximum borrowing capacity [1]     ¥ 550
Debt Instrument, Interest Rate, Stated Percentage   2.70% 2.70%
Revolving credit facilities(2)   $ 0 ¥ 0
China Credit Facilities | CNCC Working Capital Loan Agreement Due December 25, 2026 [Member]      
Debt Instrument [Line Items]      
Line of credit facility, maximum borrowing capacity [2]     ¥ 800
Debt Instrument, Interest Rate, Stated Percentage   2.34% 2.34%
Revolving credit facilities(2)   $ 66 ¥ 450
China Credit Facilities | CSIT March 2026 CNY100M Working Capital Loan Agreement      
Debt Instrument [Line Items]      
Line of credit facility, maximum borrowing capacity [2]     ¥ 100
Debt Instrument, Interest Rate, Stated Percentage   2.22% 2.22%
Revolving credit facilities(2)   $ 15 ¥ 100
China Credit Facilities | CSIT May 2026 CNY100M Working Capital Loan Agreement      
Debt Instrument [Line Items]      
Line of credit facility, maximum borrowing capacity     ¥ 100
Debt Instrument, Interest Rate, Stated Percentage   2.22% 2.22%
Revolving credit facilities(2)   $ 15 ¥ 100
China Credit Facilities | CNCC Working Capital Loan Agreement Due June 17, 2027 [Member]      
Debt Instrument [Line Items]      
Line of credit facility, maximum borrowing capacity [2]     ¥ 200
Debt Instrument, Interest Rate, Stated Percentage   2.34% 2.34%
Revolving credit facilities(2)   $ 23 ¥ 160
China Credit Facilities | CNCC Working Capital Loan Agreement Due June 28, 2027 [Member]      
Debt Instrument [Line Items]      
Line of credit facility, maximum borrowing capacity [2]     ¥ 800
Debt Instrument, Interest Rate, Stated Percentage   2.34% 2.34%
Revolving credit facilities(2)   $ 94 ¥ 640
China Credit Facilities | CNCC Working Capital Loan Agreement Due December 21, 2027 [Member]      
Debt Instrument [Line Items]      
Line of credit facility, maximum borrowing capacity [3]     ¥ 500
Debt Instrument, Interest Rate, Stated Percentage   2.44% 2.44%
Revolving credit facilities(2)   $ 63 ¥ 425
China Credit Facilities | CNCC Working Capital Loan Agreement Due March 6, 2028 [Member]      
Debt Instrument [Line Items]      
Line of credit facility, maximum borrowing capacity [2]     ¥ 750
Debt Instrument, Interest Rate, Stated Percentage   2.34% 2.34%
Revolving credit facilities(2)   $ 99 ¥ 675
China Credit Facilities | CNCC Working Capital Loan Agreement Due June 9, 2028 [Member]      
Debt Instrument [Line Items]      
Line of credit facility, maximum borrowing capacity [2]     ¥ 1,000
Debt Instrument, Interest Rate, Stated Percentage   2.35% 2.35%
Revolving credit facilities(2)   $ 102 ¥ 692
China Credit Facilities | CNCC Working Capital Loan Agreement Due July 3, 2028 [Member]      
Debt Instrument [Line Items]      
Line of credit facility, maximum borrowing capacity [2]     ¥ 300
Debt Instrument, Interest Rate, Stated Percentage   2.34% 2.34%
Revolving credit facilities(2)   $ 42 ¥ 285
China Credit Facilities | CNCC Working Capital Loan Agreement Due October 20, 2028      
Debt Instrument [Line Items]      
Line of credit facility, maximum borrowing capacity [2]     ¥ 300
Debt Instrument, Interest Rate, Stated Percentage   2.34% 2.34%
Revolving credit facilities(2)   $ 42 ¥ 285
China Credit Facilities | CNCC Term Loan Agreement Due March 11, 2031      
Debt Instrument [Line Items]      
Line of credit facility, maximum borrowing capacity     ¥ 600
Debt Instrument, Interest Rate, Stated Percentage   2.41% 2.41%
Revolving credit facilities(2)   $ 38 ¥ 260
China Credit Facilities | CNCC CNY950M Term Loan Agreement      
Debt Instrument [Line Items]      
Line of credit facility, maximum borrowing capacity [2]     ¥ 950
Debt Instrument, Interest Rate, Stated Percentage   2.41% 2.41%
Revolving credit facilities(2)   $ 15 ¥ 100
China Revolving Credit Facility | CNCC Revolving Credit Agreement      
Debt Instrument [Line Items]      
Line of credit facility, maximum borrowing capacity ¥ 100    
Debt instrument, term 12 months    
[1] Revolving credit facility guaranteed by Celanese U.S. (the "CSIT Revolving Credit Facility"), which bears interest at a fixed rate. The CSIT Revolving Credit Facility was fully repaid on January 13, 2026.
[2] Senior unsecured working capital loan bearing interest at certain floating interest rates.
[3] Senior unsecured working capital loan bearing interest at a fixed interest rate.