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Debt - Unsecured Bonds (Detail) - EUR (€)
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Debt [Line Items]      
Borrowings, interest rate   14.20%  
Non-current portion of non-current borrowings [1] € 5,705,000,000 € 4,939,000,000 € 3,427,000,000
Unsecured EUR Bonds Due 22/05/2026 1/2 percent [Member]      
Debt [Line Items]      
Borrowings, interest rate   0.50%  
Unsecured EUR Bonds Due 30/03/2025 1 3/8% [Member]      
Debt [Line Items]      
Borrowings, interest rate 1.375%    
Unsecured EUR Bonds Due 30/03/2030 2% [Member]      
Debt [Line Items]      
Borrowings, interest rate 2.00%    
Long-term borrowings [member] | Unsecured EUR Bonds Due 09/06/2023 1/2 percent [Member] | Euro [Member] | Effective interest rate [Member]      
Debt [Line Items]      
Borrowings, interest rate 0.634%    
Long-term borrowings [member] | Unsecured EUR Bonds Due 05/02/2024 3/4 percent [Member] | Euro [Member] | Effective interest rate [Member]      
Debt [Line Items]      
Borrowings, interest rate 0.861%    
Long-term borrowings [member] | Unsecured EUR Bonds Due 22/05/2026 1/2 percent [Member] | Euro [Member] | Effective interest rate [Member]      
Debt [Line Items]      
Borrowings, interest rate 0.608%    
Long-term borrowings [member] | Unsecured EUR Bonds Due 05/02/2028 1 3/8 Percent [Member] | Euro [Member] | Effective interest rate [Member]      
Debt [Line Items]      
Borrowings, interest rate 1.523%    
Long-term borrowings [member] | Unsecured USD Bonds Due 05/15/2025 7 3/4 Percent [Member] | US Dollar [Member] | Effective interest rate [Member]      
Debt [Line Items]      
Borrowings, interest rate 7.429%    
Long-term borrowings [member] | Unsecured USD Bonds Due 06/01/2026 7 1/5 Percent [Member] | US Dollar [Member] | Effective interest rate [Member]      
Debt [Line Items]      
Borrowings, interest rate 6.885%    
Long-term borrowings [member] | Unsecured USD Bonds Due 05/15/2025 7 1/8 Percent [Member] | US Dollar [Member] | Effective interest rate [Member]      
Debt [Line Items]      
Borrowings, interest rate 6.794%    
Long-term borrowings [member] | Unsecured USD Bonds Due 11/03/2038 6 7/8 Percent [Member] | US Dollar [Member] | Effective interest rate [Member]      
Debt [Line Items]      
Borrowings, interest rate 7.21%    
Long-term borrowings [member] | Unsecured USD Bonds Due 03/15/2042 5 Percent [Member] | US Dollar [Member] | Effective interest rate [Member]      
Debt [Line Items]      
Borrowings, interest rate 5.273%    
Unsecured bonds [Member]      
Debt [Line Items]      
Non-current portion of non-current borrowings € 4,439,000,000 € 3,562,000,000  
Unsecured bonds [Member] | US Dollar [Member]      
Debt [Line Items]      
Unsecured bonds adjustments [2] (39,000,000) (35,000,000)  
Unsecured bonds [Member] | Unsecured EUR Bonds Due 09/06/2023 1/2 percent [Member] | Euro [Member]      
Debt [Line Items]      
Non-current portion of non-current borrowings 500,000,000 500,000,000  
Unsecured bonds [Member] | Unsecured EUR Bonds Due 05/02/2024 3/4 percent [Member] | Euro [Member]      
Debt [Line Items]      
Non-current portion of non-current borrowings 500,000,000 500,000,000  
Unsecured bonds [Member] | Unsecured EUR Bonds Due 22/05/2026 1/2 percent [Member] | Euro [Member]      
Debt [Line Items]      
Non-current portion of non-current borrowings 750,000,000 750,000,000  
Unsecured bonds [Member] | Unsecured EUR Bonds Due 05/02/2028 1 3/8 Percent [Member] | Euro [Member]      
Debt [Line Items]      
Non-current portion of non-current borrowings 500,000,000 500,000,000  
Unsecured bonds [Member] | Unsecured EUR Bonds Due 30/03/2025 1 3/8% [Member] | Euro [Member]      
Debt [Line Items]      
Non-current portion of non-current borrowings € 500,000,000    
Unsecured bonds [Member] | Unsecured EUR Bonds Due 30/03/2025 1 3/8% [Member] | Euro [Member] | Effective interest rate [Member]      
Debt [Line Items]      
Borrowings, interest rate 1.509%    
Unsecured bonds [Member] | Unsecured EUR Bonds Due 30/03/2030 2% [Member] | Euro [Member]      
Debt [Line Items]      
Non-current portion of non-current borrowings € 500,000,000    
Unsecured bonds [Member] | Unsecured EUR Bonds Due 30/03/2030 2% [Member] | Euro [Member] | Effective interest rate [Member]      
Debt [Line Items]      
Non-current portion of non-current borrowings 0.02128    
Unsecured bonds [Member] | Unsecured USD Bonds Due 05/15/2025 7 3/4 Percent [Member] | US Dollar [Member]      
Debt [Line Items]      
Non-current portion of non-current borrowings 51,000,000 56,000,000  
Unsecured bonds [Member] | Unsecured USD Bonds Due 06/01/2026 7 1/5 Percent [Member] | US Dollar [Member]      
Debt [Line Items]      
Non-current portion of non-current borrowings 111,000,000 122,000,000  
Unsecured bonds [Member] | Unsecured USD Bonds Due 05/15/2025 7 1/8 Percent [Member] | US Dollar [Member]      
Debt [Line Items]      
Non-current portion of non-current borrowings 68,000,000 75,000,000  
Unsecured bonds [Member] | Unsecured USD Bonds Due 11/03/2038 6 7/8 Percent [Member] | US Dollar [Member]      
Debt [Line Items]      
Non-current portion of non-current borrowings 591,000,000 648,000,000  
Unsecured bonds [Member] | Unsecured USD Bonds Due 03/15/2042 5 Percent [Member] | US Dollar [Member]      
Debt [Line Items]      
Non-current portion of non-current borrowings € 407,000,000 € 446,000,000  
[1] Non-IFRS financial measure. For the definition and reconciliation of the most directly comparable IFRS measure, refer to Reconciliation of non-IFRS information.
[2] Adjustments related to both EUR and USD bonds and concern bond discounts, premium and transaction costs.