Debt - Additional Information (Detail) (USD $)	6 Months Ended
	Jun. 30, 2013	Mar. 31, 2013	Jun. 21, 2010
Proforma Debt Instrument [Line Items]
Aggregate amount add back to future non-cash charges		$ 1,250,000,000	$ 1,250,000,000
Credit agreement, maturity date	Mar. 28, 2018
Non-cash charges, including goodwill and other intangible asset impairment charges	250,000,000
Debt to total adjusted capitalization ratio	65.00%
Additional borrowing capacity	910,000,000
Absorption of reduction to shareholders' equity to remain in compliance with covenant	490,000,000
Federal Funds Effective Rate [Member]
Proforma Debt Instrument [Line Items]
Either rate per annum equal to lower of prime rate Federal Funds effective LIBOR plus one percent plus applicable margin	0.50%
Libor Rate [Member]
Proforma Debt Instrument [Line Items]
Either rate per annum equal to lower of prime rate Federal Funds effective LIBOR plus one percent plus applicable margin	1.00%
Euros Denominated Revolver [Member]
Proforma Debt Instrument [Line Items]
Borrowing capacity, maximum	500,000,000
Swingline Loans [Member]
Proforma Debt Instrument [Line Items]
Borrowing capacity, maximum	150,000,000
Letters of Credit [Member]
Proforma Debt Instrument [Line Items]
Borrowing capacity, maximum	250,000,000
Outstanding and unused Letters of Credit	$ 95,000,000
Maximum [Member]
Proforma Debt Instrument [Line Items]
Minimum interest coverage ratio	2.5
Minimum [Member]
Proforma Debt Instrument [Line Items]
Minimum interest coverage ratio	1.0