Financial Instruments - Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis - Footnotes (Detail) - USD ($) $ in Millions	Apr. 01, 2018	Dec. 31, 2017
Recurring [Member]
Footnotes to selected financial assets and liabilities:
Equity securities, held in trust	$ 31	$ 42

Footnotes to selected financial assets and liabilities [Abstract]

No definition available.

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