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Employee related obligations - Employee Related Obligations (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Jan. 01, 2023
Employee-related Liabilities [Abstract]    
Pension benefits $ 3,129 $ 2,475
Postretirement benefits 1,963 1,728
Postemployment benefits 2,527 2,832
Deferred compensation 68 100
Total employee obligations 7,687 7,135
Less current benefits payable 538 593
Employee related obligations — non-current $ 7,149 $ 6,542