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Rollforward of Reserves for Federal State and Foreign Tax Jurisdictions (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 24, 2018
Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]    
Balance, beginning of year $ 2,212  
Additions for tax positions related to the current year 52 $ 309
Additions for tax positions from prior years 5 86
Reductions for tax positions from prior years   (51)
Settlement payments   (4)
Statute of limitations expiration (14) (33)
Translation and other 16 20
Balance, end of period $ 2,271 $ 1,885