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Debt And Lines Of Credit (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Sep. 30, 2020
Aug. 31, 2020
Sep. 30, 2020
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Schedule of Debt Activity [Line Items]              
Maturities of long-term debt, 2021         $ 29    
Maturities of long-term debt, 2022         199    
Maturities of long-term debt, 2023         361    
Maturities of long-term debt, 2024         152    
Maturities of long-term debt, 2025         209    
Minimum Net Worth Required for Compliance         $ 9,000    
Debt covenant compliance, minimum debt to capital ratio         60.00%    
Extinguishment of Debt, Amount [1]         $ 1,640 $ 614 $ 780
Graphic Packaging LLC [Member] | Reportable Subsegments [Member]              
Schedule of Debt Activity [Line Items]              
Proceeds from exchange of aggregate units owned in an equity method investment       $ 250      
Minimum [Member]              
Schedule of Debt Activity [Line Items]              
Debt instrument, interest rate, stated percentage         3.00% 3.00% 3.00%
Maximum [Member]              
Schedule of Debt Activity [Line Items]              
Debt instrument, interest rate, stated percentage         9.50% 9.50% 9.50%
Commercial Paper [Member]              
Schedule of Debt Activity [Line Items]              
Revolving credit facilities available         $ 1,000    
Short-term Debt         0 $ 30  
Revolving Credit Facility [Member]              
Schedule of Debt Activity [Line Items]              
Revolving credit facilities available         1,500    
Receivables Securitization Program [Member]              
Schedule of Debt Activity [Line Items]              
Commercial paper-based financings agreement value         550    
Collateralized agreements, value of amount outstanding         0    
364-Day Revolving Credit Agreement [Member]              
Schedule of Debt Activity [Line Items]              
Revolving credit facilities available         $ 750    
7.500% notes – due 2021              
Schedule of Debt Activity [Line Items]              
Debt instrument, interest rate, stated percentage         7.50% 7.50%  
3.650% notes – due 2024              
Schedule of Debt Activity [Line Items]              
Debt instrument, interest rate, stated percentage         3.65% 3.65%  
Seven Point Five Percentage Notes Due Twenty Twenty Six [Member]              
Schedule of Debt Activity [Line Items]              
Debt instrument, interest rate, stated percentage         3.80%    
Three Point Zero Notes Due Twenty Twenty Seven [Member]              
Schedule of Debt Activity [Line Items]              
Debt instrument, interest rate, stated percentage 3.00%   3.00%        
Other Debt Obligations [Member]              
Schedule of Debt Activity [Line Items]              
Repayments of Debt         $ 638    
Proceeds from Issuance of Debt         583    
Other Corporate Bonds [Member]              
Schedule of Debt Activity [Line Items]              
Extinguishment of Debt, Amount         152    
Other Corporate Bonds [Member] | 7.500% notes – due 2021              
Schedule of Debt Activity [Line Items]              
Repayments of Debt         $ 406    
Other Corporate Bonds [Member] | 3.650% notes – due 2024              
Schedule of Debt Activity [Line Items]              
Repayments of Debt $ 658            
Other Corporate Bonds [Member] | Seven Point Five Percentage Notes Due Twenty Twenty Six [Member]              
Schedule of Debt Activity [Line Items]              
Repayments of Debt   $ 127          
Other Corporate Bonds [Member] | Three Point Zero Notes Due Twenty Twenty Seven [Member]              
Schedule of Debt Activity [Line Items]              
Repayments of Debt     $ 297        
Bonds [Member] | Minimum [Member]              
Schedule of Debt Activity [Line Items]              
Debt instrument, interest rate, stated percentage         3.00%    
Bonds [Member] | Maximum [Member]              
Schedule of Debt Activity [Line Items]              
Debt instrument, interest rate, stated percentage         4.40%    
[1] Reductions related to notes with interest rates ranging from 3.00% to 9.50% with original maturities from 2021 to 2048 for the years ended December 31, 2020, 2019 and 2018.