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Long-Term Debt - Additional Information (Details) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 12, 2025 | May 09, 2025 | May 31, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024 | Aug. 25, 2025 | Jun. 05, 2024
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt and lease obligations |  |  |  | $ 10,605,000,000 |  | $ 10,605,000,000 |  | $ 11,452,000,000 |  |
Pre-tax gain (loss) from early extinguishment of debt |  |  |  | (33,000,000) | $ 0 | 105,000,000 | $ 25,000,000 |  |  |
Interest paid on borrowings |  |  |  | 214,000,000 | $ 202,000,000 | 622,000,000 | 562,000,000 |  |  |
Asset Based Loan Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt and lease obligations |  |  |  | 0 |  | 0 |  | $ 341,000,000 |  |
Line of credit facility, excess availability |  |  |  | 806,000,000 |  | 806,000,000 |  |  |  |
Line of credit outstanding amount |  |  |  | 0 |  | 0 |  |  |  |
Letters of credit reduced during period |  |  |  |  |  | 32,000,000 |  |  |  |
Asset Based Loan Facility | ABL Facility Customary Covenants |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  | 95,000,000 |  | $ 95,000,000 |  |  |  |
Debt instrument variable interest rate |  |  |  |  |  | 10.00% |  |  |  |
Asset Based Loan Facility | Letter of Credit |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit outstanding amount |  |  |  | $ 34,000,000 |  | $ 34,000,000 |  |  |  |
Senior Secured Notes at 10.750% Due 2033 | Senior Secured Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, offering date |  | May 09, 2025 |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  | 10.75% |  | 10.75% |  | 10.75% |  | 10.75% |  |
Description of debt redemption |  |  |  |  |  | CHS is entitled, at its option, to redeem all or a portion of the 10¾% Senior Secured Notes due 2033 at any time prior to June 15, 2030, upon not less than 10 nor more than 60 days’ notice, at a price equal to 100% of the principal amount of the 10¾% Senior Secured Notes due 2033 redeemed plus accrued and unpaid interest, if any, plus a “make-whole” premium, as described in the indenture governing the 10¾% Senior Secured Notes due 2033. CHS may redeem up to 35% of the aggregate principal amount of the 10¾% Senior Secured Notes due 2033 at any time prior to June 15, 2030 using the net proceeds from certain equity offerings at a redemption price of 103.000% of the principal amount of the 10¾% Senior Secured Notes due 2033 redeemed, plus accrued and unpaid interest, if any. At any time and from time to time on or after June 15, 2030, CHS may redeem the 10¾% Senior Secured Notes due 2033 in whole or in part, upon not less than 10 nor more than 60 days’ prior written notice at a redemption price equal to the percentage of principal amount set forth below plus accrued and unpaid interest, if any, on the 10¾% Senior Secured Notes due 2033 redeemed, to, but excluding, the applicable date of redemption, if redeemed during the twelve-month period beginning on June 15 of the years |  |  |  |
Minimum period notice for redemption of debt |  | 10 days |  |  |  |  |  |  |  |
Maximum period notice for redemption of debt |  | 60 days |  |  |  |  |  |  |  |
Redemption price percentage |  | 103.00% |  |  |  |  |  |  |  |
Debt instrument, maturity year |  |  |  |  |  | 2033 |  | 2033 |  |
Debt intrument, issuance price |  | 103.00% |  |  |  |  |  |  |  |
Debt and lease obligations |  |  |  | $ 700,000,000 |  | $ 700,000,000 |  |  |  |
Line of credit facility, maximum borrowing capacity |  | $ 700,000,000 |  |  |  |  |  |  |  |
Senior Secured Notes at 10.750% Due 2033 | Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  | 6.875% |  |  |  |  |  |  |  |
Senior Secured Notes at 10.750% Due 2033 | Price Equal to 100% of Principal Amount | Senior Secured Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Minimum period notice for redemption of debt |  | 10 days |  |  |  |  |  |  |  |
Maximum period notice for redemption of debt |  | 60 days |  |  |  |  |  |  |  |
Percentage of principal amount of debt to be redeemed |  | 100.00% |  |  |  |  |  |  |  |
Senior Secured Notes at 10.750% Due 2033 | Redemption Price of 103.000% of Principal Amount | Senior Secured Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of principal amount of debt to be redeemed |  | 35.00% |  |  |  |  |  |  |  |
Senior Secured Notes at 9.750% Due 2034 | Senior Secured Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, offering date | Aug. 12, 2025 |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage | 9.75% |  |  | 9.75% |  | 9.75% |  | 9.75% |  |
Debt instrument, maturity year |  |  |  |  |  | 2034 |  | 2034 |  |
Debt and lease obligations |  |  |  | $ 1,790,000,000 |  | $ 1,790,000,000 |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 1,790,000,000 |  |  |  |  |  |  |  |  |
Senior Secured Notes at 9.750% Due 2034 | Senior Secured Notes | At Any Time Prior to August 15, 2028 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage | 9.75% |  |  |  |  |  |  |  |  |
Redemption price percentage | 109.75% |  |  |  |  |  |  |  |  |
Debt intrument, issuance price | 109.75% |  |  |  |  |  |  |  |  |
Senior Secured Notes at 9.750% Due 2034 | Senior Secured Notes | Any Time Prior to August 15, 2028, But Not More Than Once During Each 12 Month Period |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage | 9.75% |  |  |  |  |  |  |  |  |
Redemption price percentage | 103.00% |  |  |  |  |  |  |  |  |
Debt intrument, issuance price | 103.00% |  |  |  |  |  |  |  |  |
Senior Secured Notes at 9.750% Due 2034 | Senior Secured Notes | At Any Time and From Time to Time On or After August 15, 2028 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage | 9.75% |  |  |  |  |  |  |  |  |
Senior Secured Notes at 9.750% Due 2034 | Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Pre-tax gain (loss) from early extinguishment of debt |  |  |  | (33,000,000) |  | 105,000,000 | 26,000,000 |  |  |
After-tax gain (loss) from extinguishment of debt |  |  |  | $ (26,000,000) |  | $ 113,000,000 | $ 27,000,000 |  |  |
Senior Secured Notes at 9.750% Due 2034 | Price Equal to 100% of Principal Amount | Senior Secured Notes | At Any Time Prior to August 15, 2028 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Minimum period notice for redemption of debt | 10 days |  |  |  |  |  |  |  |  |
Maximum period notice for redemption of debt | 60 days |  |  |  |  |  |  |  |  |
Percentage of principal amount of debt to be redeemed | 100.00% |  |  |  |  |  |  |  |  |
Senior Secured Notes at 9.750% Due 2034 | Price Equal to 100% of Principal Amount | Senior Secured Notes | At Any Time and From Time to Time On or After August 15, 2028 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Minimum period notice for redemption of debt | 10 days |  |  |  |  |  |  |  |  |
Maximum period notice for redemption of debt | 60 days |  |  |  |  |  |  |  |  |
Senior Secured Notes at 9.750% Due 2034 | Redemption Price of 103.000% of Principal Amount | Senior Secured Notes | At Any Time Prior to August 15, 2028 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of principal amount of debt to be redeemed | 40.00% |  |  |  |  |  |  |  |  |
Senior Secured Notes at 9.750% Due 2034 | Redemption Price of 103.000% of Principal Amount | Senior Secured Notes | Any Time Prior to August 15, 2028, But Not More Than Once During Each 12 Month Period |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of principal amount of debt to be redeemed | 10.00% |  |  |  |  |  |  |  |  |
6.875% Senior Unsecured Notes due 2028 | Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of outstanding notes funded using cash on hand |  |  | 93.00% |  |  |  |  |  |  |
Debt instrument aggregate principal amount |  |  | $ 584,000,000 |  |  |  |  |  |  |
Line of credit outstanding amount |  |  | $ 42,000,000 |  |  |  |  |  |  |
Senior Secured Notes at 8%, Due 2027 | Senior Secured Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  | 8.00% |  | 8.00% |  | 8.00% |  | 8.00% |  |
Debt instrument, maturity year |  |  |  |  |  | 2027 |  | 2027 |  |
Debt and lease obligations |  |  |  |  |  |  |  | $ 700,000,000 |  |
Senior Secured Notes 5.250%, Due 2030 | Senior Secured Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  | 5.25% |  | 5.25% |  | 5.25% |  |
Debt instrument, maturity year |  |  |  |  |  | 2030 |  | 2030 |  |
Debt and lease obligations |  |  |  | $ 1,535,000,000 |  | $ 1,535,000,000 |  | $ 1,535,000,000 |  |
Senior Secured Notes at 10.875%, Due 2032 | Senior Secured Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt and lease obligations |  |  |  | $ 2,225,000,000 |  | $ 2,225,000,000 |  | $ 2,225,000,000 |  |
Senior Secured Notes at 5.625% due 2027 | Senior Secured Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage | 5.625% |  |  | 5.625% |  | 5.625% |  | 5.625% | 5.625% |
Percentage of principal amount of debt to be redeemed | 99.00% |  |  |  |  |  |  |  |  |
Debt instrument, maturity year |  |  |  |  |  | 2027 |  | 2027 |  |
Debt and lease obligations |  |  |  | $ 14,000,000 |  | $ 14,000,000 |  | $ 1,757,000,000 |  |
Debt redeemed | $ 1,743,000,000 |  |  |  |  |  |  |  |  |
Senior Secured Notes at 5.625% due 2027 | Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit outstanding amount |  |  |  |  |  |  |  |  | $ 14,000,000 |
Senior Secured Notes at 10.875%, Due 2032 | Senior Secured Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  | 10.875% |  | 10.875% |  | 10.875% |  |
Debt instrument, maturity year |  |  |  |  |  | 2032 |  | 2032 |  |
Second Amendment and Restatement Agreement to Amended and Restated Asset-Based Loan Credit Agreement |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  | $ 1,000,000,000
Second Amendment and Restatement Agreement to Amended and Restated Asset-Based Loan Credit Agreement | Letter of Credit |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  | $ 200,000,000

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