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Retirement benefits - Summary of Plan Assets Measured at Fair Value (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Disclosure of defined benefit plans [line items]
Fair value of plan assets	$ 0	$ 152
United States [member]
Disclosure of defined benefit plans [line items]
Fair value of plan assets	0	152
United States [member] | Investments quoted in active markets [member]
Disclosure of defined benefit plans [line items]
Investment funds: fixed income securities	0	150
United States [member] | Unquoted investments [member]
Disclosure of defined benefit plans [line items]
Cash	$ 0	$ 2

X

- Definition

The amount that cash and cash equivalents constitute of the fair value of defined benefit plan assets. [Refer: Cash and cash equivalents; Plan assets, at fair value; Defined benefit plans [member]]

+ References

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- Definition

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No definition available.

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- Definition

The amount that investment funds constitute of the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]; Investment funds [member]]

+ References

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- Definition

The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]]

+ References

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