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Employee Related Obligations - Employee Related Obligations (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Jan. 01, 2017
Employee-related Liabilities [Abstract]    
Pension benefits $ 5,343 $ 4,710
Postretirement benefits 2,331 2,733
Postemployment benefits 2,250 2,050
Deferred compensation 475 534
Total employee obligations 10,399 10,027
Less current benefits payable 325 412
Employee related obligations — non-current $ 10,074 $ 9,615