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Contingencies and commitments - Summary of aggregate amount of minimum lease payments under non-cancellable operating leases (Parenthetical) (Detail) $ in Millions	Dec. 31, 2016 USD ($)
Disclosure Of Finance Lease And Operating Lease By Lessee [Abstract]
2016 minimum lease payments amended to exclude contractual obligations which do not qualify as leases	$ 125

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- References

No definition available.

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- Definition

Minimum lease payments amended to exclude contractual obligations which do not qualify as leases.

+ References

No definition available.

+ Details

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