DEBT - Schedule of Long-Term Debt (Details) $ in Millions	Jun. 30, 2025 USD ($)	Jun. 30, 2025 EUR (€)	Dec. 31, 2024 USD ($)
Debt Instrument [Line Items]
Long-term debt	$ 5,696		$ 5,046
Finance Leases	144		145
Total Long-Term Debt Including Current Portion	5,840		5,191
Less: Current Portion	424		21
Total Long-term Debt Excluding Current Portion	5,416		5,170
Less: Unamortized Debt Deferred Issuance Costs	24		25
Total Long-Term Debt	5,392		5,145
Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt	$ 1,098		$ 610
Stated interest rate	5.86%	5.86%
Interest rate at period end	5.86%	5.86%	6.65%
Other
Debt Instrument [Line Items]
Other	$ 3		$ 3
1.512% Senior Notes Due In 2026 \| Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 400		400
Stated interest rate	1.512%	1.512%
Interest rate at period end	1.51%	1.51%
4.75 % Senior Notes Due in 2027 \| Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 300		300
Stated interest rate	4.75%	4.75%
Interest rate at period end	4.77%	4.77%
3.50% Senior Notes Due in 2028 \| Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 450		450
Stated interest rate	3.50%	3.50%
Interest rate at period end	3.52%	3.52%
3.50% Senior Notes Due in 2029 \| Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 350		350
Stated interest rate	3.50%	3.50%
Interest rate at period end	3.52%	3.52%
2.625% Senior Notes Due 2029 \| Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 341		300
Stated interest rate	2.625%	2.625%
Interest rate at period end	2.64%	2.64%
Aggregate principal amount \| €		€ 290,000,000
3.75% Senior Notes due 2030
Debt Instrument [Line Items]
Stated interest rate	3.75%	3.75%
3.75% Senior Notes due 2030 \| Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 400		400
Stated interest rate	3.75%	3.75%
Interest rate at period end	3.78%	3.78%
6.375% Senior Notes Due 2032 \| Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 500		500
Stated interest rate	6.375%	6.375%
Interest rate at period end	6.45%	6.45%
4.00% Tax Exempt Green Bonds Due in 2026 \| Bonds
Debt Instrument [Line Items]
Long-term debt	$ 103		104
Stated interest rate	4.00%	4.00%
Interest rate at period end	1.71%	1.71%
5.00% Tax Exempt Green Bonds Due in 2030 \| Bonds
Debt Instrument [Line Items]
Long-term debt	$ 100		0
Stated interest rate	5.00%	5.00%
Interest rate at period end	4.654%	4.654%
Senior Secured Term Loan A-2 Facility \| Senior Term Notes
Debt Instrument [Line Items]
Long-term debt	$ 425		425
Stated interest rate	2.67%	2.67%
Interest rate at period end	2.68%	2.68%
Senior Secured Term Loan A-3 Facility \| Senior Term Notes
Debt Instrument [Line Items]
Long-term debt	$ 250		250
Stated interest rate	5.35%	5.35%
Interest rate at period end	5.35%	5.35%
Senior Secured Term Loan A-5 Facility \| Senior Term Notes
Debt Instrument [Line Items]
Long-term debt	$ 50		50
Stated interest rate	5.32%	5.32%
Interest rate at period end	5.33%	5.33%
Senior Secured Term Loan A-6 Facility \| Senior Term Notes
Debt Instrument [Line Items]
Long-term debt	$ 200		200
Stated interest rate	5.37%	5.37%
Interest rate at period end	5.38%	5.38%
Senior Secured Term Loan A-1 Facility \| Senior Term Notes
Debt Instrument [Line Items]
Long-term debt	$ 491		497
Interest rate at period end	5.92%	5.92%
Euro Note \| Senior Term Notes
Debt Instrument [Line Items]
Long-term debt	$ 235		$ 207
Stated interest rate	3.37%	3.37%
Aggregate principal amount \| €		€ 200,000,000

GRAPHIC PACKAGING HOLDING CO 10-Q