Payroll and Related Benefits - Summary of Payroll and Related Benefits (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Share Of Equity Investment [line items]
Share-based payment expense	$ (353)	$ (359)	$ (228)
Payroll and related benefits	(193)	(196)	(194)
Payroll and related benefits [member]
Disclosure Of Share Of Equity Investment [line items]
Wages and salaries	(4,726)	(4,884)	(4,404)
Social security contributions	(698)	(699)	(647)
Other personnel cost	(708)	(762)	(580)
Pension expense for defined benefit plans	(193)	(196)	(194)
Share-based payment expense	(353)	(359)	(228)
Contributions to defined contribution plans	(116)	(118)	(77)
Payroll and related benefits	$ (6,794)	$ (7,018)	$ (6,130)

Disclosure Of Share Of Equity Investment

No definition available.

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- Definition

The expense of all forms of consideration given by an entity in exchange for a service rendered by employees or for the termination of employment.

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- Definition

The amount of expense from share-based payment transactions with employees.

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- Definition

The amount of employee expenses that the entity does not separately disclose in the same statement or note.

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- Definition

The amount of post-employment benefit expense relating to defined benefit plans. [Refer: Defined benefit plans [member]]

+ References

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- Definition

The amount of post-employment benefit expense relating to defined contribution plans. Defined contribution plans are post-employment benefit plans under which an entity pays fixed contributions into a separate entity (a fund) and will have no legal or constructive obligation to pay further contributions if the fund does not hold sufficient assets to pay all employee benefits relating to employee service in the current and prior periods.

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- Definition

A class of employee benefits expense that represents social security contributions. [Refer: Employee benefits expense]

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- Definition

A class of employee benefits expense that represents wages and salaries. [Refer: Employee benefits expense]

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