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Derivative instruments - (Cross-currency Swaps) (Details)
€ in Millions, £ in Millions, SFr in Millions, $ in Millions
Dec. 31, 2022
USD ($)
Dec. 31, 2022
EUR (€)
Dec. 31, 2022
CHF (SFr)
Dec. 31, 2022
GBP (£)
0.41% Swiss Franc Bonds Due 2023 (0.41% 2023 Swiss franc Bonds)        
Derivative [Line Items]        
Interest rate, stated percentage 0.41% 0.41% 0.41% 0.41%
Cash flow hedge [Member] | Cross-currency swap contracts | 0.41% Swiss Franc Bonds Due 2023 (0.41% 2023 Swiss franc Bonds)        
Derivative [Line Items]        
Notional amount $ 704   SFr 700  
Cash flow hedge [Member] | Cross-currency swap contracts | 2.00% €750 million notes due 2026 (2.00% 2026 euro Notes)        
Derivative [Line Items]        
Notional amount 833 € 750    
Cash flow hedge [Member] | Cross-currency swap contracts | 5.50% 2026 pound sterling Notes [Member]        
Derivative [Line Items]        
Notional amount 747     £ 475
Cash flow hedge [Member] | Cross-currency swap contracts | 4.00% 2029 pound sterling Notes [Member]        
Derivative [Line Items]        
Notional amount $ 1,111     £ 700
Cash flow hedge [Member] | Cross-currency swap contracts | Euro Member Countries, Euro [Member] | 2.00% €750 million notes due 2026 (2.00% 2026 euro Notes)        
Derivative [Line Items]        
Interest rates 2.00% 2.00% 2.00% 2.00%
Cash flow hedge [Member] | Cross-currency swap contracts | Switzerland, Francs [Member] | 0.41% Swiss Franc Bonds Due 2023 (0.41% 2023 Swiss franc Bonds)        
Derivative [Line Items]        
Interest rates 0.40% 0.40% 0.40% 0.40%
Cash flow hedge [Member] | Cross-currency swap contracts | United Kingdom, Pounds [Member] | 5.50% 2026 pound sterling Notes [Member]        
Derivative [Line Items]        
Interest rates 5.50% 5.50% 5.50% 5.50%
Cash flow hedge [Member] | Cross-currency swap contracts | United Kingdom, Pounds [Member] | 4.00% 2029 pound sterling Notes [Member]        
Derivative [Line Items]        
Interest rates 4.00% 4.00% 4.00% 4.00%
Cash flow hedge [Member] | Cross-currency swap contracts | United States of America, Dollars [Member] | 0.41% Swiss Franc Bonds Due 2023 (0.41% 2023 Swiss franc Bonds)        
Derivative [Line Items]        
Interest rates 3.40% 3.40% 3.40% 3.40%
Cash flow hedge [Member] | Cross-currency swap contracts | United States of America, Dollars [Member] | 2.00% €750 million notes due 2026 (2.00% 2026 euro Notes)        
Derivative [Line Items]        
Interest rates 3.90% 3.90% 3.90% 3.90%
Cash flow hedge [Member] | Cross-currency swap contracts | United States of America, Dollars [Member] | 5.50% 2026 pound sterling Notes [Member]        
Derivative [Line Items]        
Interest rates 6.00% 6.00% 6.00% 6.00%
Cash flow hedge [Member] | Cross-currency swap contracts | United States of America, Dollars [Member] | 4.00% 2029 pound sterling Notes [Member]        
Derivative [Line Items]        
Interest rates 4.60% 4.60% 4.60% 4.60%