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Accumulated Other Comprehensive Loss - Schedule of Net Income Amounts Reclassified from AOCL (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Sales $ (38,946) $ (36,445)
Cost of sales 33,258 31,123
Income tax 744 706
Net of tax (2,206) (2,031)
Total loss reclassified to net income (65) (135)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net (Loss) Gain from Designated or Qualifying Cash Flow Hedges [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Sales (30) (87)
Cost of sales (54) (87)
Income tax 24 48
Net of tax (60) (126)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Unrealized Loss On Other Long Term Liabilities [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Cost of sales (6) (13)
Income tax 1 4
Net of tax $ (5) $ (9)