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Accumulated Other Comprehensive Loss - Schedule of Net Income Amounts Reclassified from AOCL (Detail) - USD ($) $ in Millions | 12 Months Ended
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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)

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