v3.26.1
Financial instruments and Retirement benefit obligations - Financial instruments - Corporate bonds and private placement debt (Details) - USD ($)
$ in Millions
Jun. 27, 2026
Dec. 31, 2025
Jun. 28, 2025
Disclosure of detailed information about financial instruments [line items]      
Book value $ 5,094 $ 4,478 $ 4,439
Not measured at fair value      
Disclosure of detailed information about financial instruments [line items]      
Book value 4,796 4,354 4,314
2030 USD corporate bond | Not measured at fair value      
Disclosure of detailed information about financial instruments [line items]      
Book value 897 897 996
Market value 802 810 875
2034 USD corporate bond | Not measured at fair value      
Disclosure of detailed information about financial instruments [line items]      
Book value 635 641 648
Market value 659 672 659
2027 USD corporate bond | Not measured at fair value      
Disclosure of detailed information about financial instruments [line items]      
Book value 349 349 348
Market value 351 354 354
2029 EUR corporate bond | Not measured at fair value      
Disclosure of detailed information about financial instruments [line items]      
Book value 571 591 611
Market value 594 617 623
2038 EUR corporate bond | Not measured at fair value      
Disclosure of detailed information about financial instruments [line items]      
Book value 567    
Market value 580    
Private placement debt | Not measured at fair value      
Disclosure of detailed information about financial instruments [line items]      
Book value 550 625 625
Market value $ 516 $ 594 $ 589