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Debt - Debt (Detail) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Debt Instrument [Line Items] |  |
Capital Leases and other debt | $ 237 | $ 45
Total debt | 3,214 | 3,909
Total debt | 3,214 | 3,909
Less current portion | 506 | 2
Long-term debt | 2,708 | 3,907
Five-year Unsecured Revolving Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Commercial paper |  | 890
Senior Notes, Interest at 1.35% Payable Semiannually, Principal Due on December 1, 2017 [Member] |  |
Debt Instrument [Line Items] |  |
Senior Notes | 499 | 498
Senior Notes, Interest at 2.60% Payable Semiannually, Principal Due on December 1, 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Senior Notes | 1,391 | 1,389
Senior Notes, Interest at 3.95% Payable Semiannually, Principal Due on December 1, 2042 [Member] |  |
Debt Instrument [Line Items] |  |
Senior Notes | $ 1,087 | $ 1,087

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