Retirement and Deferred Compensation Plans - Changes in Benefit Obligation, Fair Value of Plan Assets and Funded Status of Pension and Postretirement Benefit Plans (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Change in Projected Benefit Obligation
Benefits paid			$ (5)
Change in Plan Assets
Fair value of plan assets at beginning of year	$ 197
Benefits paid			(5)
Fair value of plan assets at end of year	206	$ 197
Pension Benefits [Member]
Change in Projected Benefit Obligation
Projected benefit obligation beginning of year	202	216	189
Service cost	4	5	5
Interest cost	7	8	9
Foreign currency exchange rate changes	(39)	(10)	(13)
Actuarial losses (gains)	32	(10)	31
Benefits paid	(4)	(7)	(5)
Projected benefit obligation at end of year	202	202	216
Change in Plan Assets
Fair value of plan assets at beginning of year	197	206	191
Actual return on plan assets	46	1	25
Foreign currency exchange rates	(39)	(10)	(13)
Employer contributions	6	7	8
Benefits paid	(4)	(7)	(5)
Fair value of plan assets at end of year	206	197	206
Funded status at end of year	4	(5)	(10)
Amounts recognized in Consolidated Balance Sheet
Current liability			0
Non-current asset (liability)	4	(5)	(10)
Defined Benefit Plans, Liabilities, Total	4	(5)	(10)
Pre-tax Amounts Recognized in Accumulated Other Comprehensive Income (Loss)
Accumulated gain (loss)	$ (25)	$ (32)	$ (37)
Weighted Average Assumptions used as of December 31
Discount rate	2.70%	3.90%	3.70%
Salary increases	4.80%	4.60%	4.60%
Expected return on assets	3.40%	4.10%	3.90%
Postretirement Benefits [Member]
Change in Projected Benefit Obligation
Projected benefit obligation beginning of year	$ 26	$ 22	$ 28
Service cost	2	2	3
Interest cost	1	1	1
Actuarial losses (gains)	(2)		(9)
Effect of curtailment and settlements		2
Benefits paid	(3)	(2)	(2)
Retiree contributions	2	1	1
Projected benefit obligation at end of year	26	26	22
Change in Plan Assets
Employer contributions	1	1	1
Benefits paid	(3)	(2)	(2)
Retiree contributions	2	1	1
Funded status at end of year	(26)	(26)	(22)
Amounts recognized in Consolidated Balance Sheet
Current liability	(2)	(2)	(1)
Non-current asset (liability)	(24)	(24)	(21)
Defined Benefit Plans, Liabilities, Total	(26)	(26)	(22)
Pre-tax Amounts Recognized in Accumulated Other Comprehensive Income (Loss)
Accumulated gain (loss)	$ 9	$ 9	$ 10
Weighted Average Assumptions used as of December 31
Discount rate	3.76%	3.95%	3.62%
Healthcare cost trend
Initial	7.00%	7.00%	7.00%
Ultimate in 2025	5.00%	5.00%	5.00%

Defined benefit plan assumptions used calculating benefit obligation expected return on assets.

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Defined benefit plan change in fair value of plan assets.

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Health care cost trend.

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Pension and other postretirement defined benefit plans assets liabilities noncurrent.

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Pension and other postretirement defined benefit plans liabilities net current and noncurrent.

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The pretax net amount of gains and losses that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases or decreases in other comprehensive income as they arise. Gains and losses are due to changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan.

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Actual return on plan assets, separately identifying the amount related to assets still held at the reporting date.

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Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan.

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The interest rate used to adjust for the time value of money for the plan.

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- Definition

Expected rate of compensation increases (for pay-related plans).

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- Definition

1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

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The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of contributions made by the employer to defined benefit plans.

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The amount of contributions made by plan participants. This item represents a periodic increase to the plan obligation and an increase to plan assets.

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Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

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Amount of gain (loss) from foreign currency exchange rate changes for benefit obligation for plans of a foreign operation whose functional currency is not the reporting currency.

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The amount of increase or decrease in plan assets attributed to foreign currency changes. The effects of foreign currency exchange rate changes that are to be disclosed are those applicable to plans of a foreign operation whose functional currency is not the reporting currency.

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The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total.

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The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

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The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

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Amount of net gain (loss) recognized in net periodic benefit cost due to settlements and curtailments. Curtailments result from an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services. Settlements result from an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits.

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The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

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The ultimate trend rate for health care costs.

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No definition available.

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For a classified balance sheet, the amount recognized in balance sheet as a current liability associated with an underfunded defined benefit plan.

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