Fair Value Measurements - Financial Assets and Liabilities Measured on Recurring Basis (Detail) (Fair Value, Measurements, Recurring, USD $) In Millions, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Assets:
Asset	$ 66		$ 55
Liabilities:
Liabilities	34		35
Interest Rate Swap Arrangements
Assets:
Asset	2	[1]
Liabilities:
Liabilities	7	[1]	10	[1]
Deferred Compensation Liabilities
Liabilities:
Liabilities	27	[2]	25	[2]
Level 1
Assets:
Asset	64		55
Liabilities:
Liabilities	27		25
Level 1 | Deferred Compensation Liabilities
Liabilities:
Liabilities	27	[2]	25	[2]
Level 2
Assets:
Asset	2
Liabilities:
Liabilities	7		10
Level 2 | Interest Rate Swap Arrangements
Assets:
Asset	2	[1]
Liabilities:
Liabilities	7	[1]	10	[1]
Investments in Equity Securities
Assets:
Asset	35	[3]	28	[3]
Investments in Equity Securities | Level 1
Assets:
Asset	35	[3]	28	[3]
Plan Assets for Deferred Compensation
Assets:
Asset	27	[4]	25	[4]
Plan Assets for Deferred Compensation | Level 1
Assets:
Asset	27	[4]	25	[4]
Investment In Mutual Funds
Assets:
Asset	2	[5]	2	[5]
Investment In Mutual Funds | Level 1
Assets:
Asset	$ 2	[5]	$ 2	[5]

[1] Derivative financial instruments include interest rate swap arrangements recorded at fair value based on externally-developed valuation models that use readily observable market parameters and the consideration of counterparty risk.

[2] The Company offers certain employees the opportunity to participate in a deferred compensation plan. A participant’s deferrals are invested in a variety of participant directed stock and bond mutual funds and are classified as trading securities. Changes in the fair value of these securities are measured using quoted prices in active markets based on the market price per unit multiplied by the number of units held exclusive of any transaction costs. A corresponding adjustment for changes in fair value of the trading securities is also reflected in the changes in fair value of the deferred compensation obligation.

[3] Investments in equity securities are carried at fair value, which is based on the quoted market price at period end in an active market. These investments are classified as available-for-sale with any unrealized gains or losses resulting from changes in fair value recorded, net of tax, as a component of accumulated other comprehensive income/(loss) until realized.

[4] Plan assets are comprised of investments in mutual funds, which are intended to fund liabilities arising from deferred compensation plans. These investments are carried at fair value, which is based on quoted market prices at period end in active markets. These investments are classified as trading securities with any gains or losses resulting from changes in fair value recorded in other expense, net.

[5] Investments in mutual funds are money-market accounts held with the intention of funding certain specific retirement plans.