Financing - Additional Information (Detail) (USD $)	0 Months Ended	1 Months Ended	6 Months Ended				1 Months Ended	0 Months Ended			0 Months Ended										0 Months Ended
	Feb. 15, 2014	Dec. 31, 2013	Feb. 15, 2014	Feb. 09, 2013	Aug. 31, 2013	Dec. 31, 2013 Letters of Credit [Member]	Dec. 31, 2013 Capital Leases [Member]	Apr. 29, 2013 3.125% Senior Notes due July 2023, Effective Interest Rate of 3.26% [Member]	Feb. 15, 2014 3.125% Senior Notes due July 2023, Effective Interest Rate of 3.26% [Member]	Aug. 31, 2013 3.125% Senior Notes due July 2023, Effective Interest Rate of 3.26% [Member]	Nov. 13, 2012 2.875% Senior Notes due January 2023, Effective Interest Rate of 3.21% [Member]	Feb. 15, 2014 2.875% Senior Notes due January 2023, Effective Interest Rate of 3.21% [Member]	Aug. 31, 2013 2.875% Senior Notes due January 2023, Effective Interest Rate of 3.21% [Member]	Nov. 13, 2012 5.750% Senior Notes due January 2015, Effective Interest Rate of 5.89% [Member]	Feb. 15, 2014 Commercial paper, weighted average interest rate of 0.25% and 0.29% at February 15, 2014 and August 31, 2013, respectively [Member]	Feb. 15, 2014 5.750% Senior Notes due January 2015, Effective Interest Rate of 5.89% [Member]	Aug. 31, 2013 5.750% Senior Notes due January 2015, Effective Interest Rate of 5.89% [Member]	Feb. 15, 2014 6.500% Senior Notes due January 2014, Effective Interest Rate of 6.63% [Member]	Jan. 14, 2014 6.500% Senior Notes due January 2014, Effective Interest Rate of 6.63% [Member]	Aug. 31, 2013 6.500% Senior Notes due January 2014, Effective Interest Rate of 6.63% [Member]	Jan. 14, 2014 1.300% Senior Notes due January 2017, Effective Interest Rate of 1.43% [Member]	Feb. 15, 2014 1.300% Senior Notes due January 2017, Effective Interest Rate of 1.43% [Member]	Aug. 31, 2013 1.300% Senior Notes due January 2017, Effective Interest Rate of 1.43% [Member]	Apr. 29, 2013 4.375% Senior Notes due June 2013, Effective Interest Rate of 5.65% [Member]
Line of Credit Facility [Line Items]
Total debt	$ 4,321,684,000		$ 4,321,684,000		$ 4,187,000,000				$ 500,000,000	$ 500,000,000		$ 300,000,000	$ 300,000,000		$ 871,684,000	$ 500,000,000	$ 500,000,000			$ 500,000,000		$ 400,000,000
Senior notes non current																341,600,000
Stated interest rate percentage								3.125%	3.125%	3.125%	2.875%	2.875%	2.875%	5.875%		5.75%	5.75%	6.50%	6.50%	6.50%	1.30%	1.30%	1.30%	4.375%
Debt instrument, due date								July 2023	July 2023	July 2023	January 2023	January 2023	January 2023	October 2012		January 2015	January 2015	January 2014	January 2014	January 2014	January 2017	January 2017	January 2017	June 2013
Remaining borrowing capacity under revolving credit facility	1,213,000,000		1,213,000,000
Amount available under credit facility	1,250,000,000	1,250,000,000	1,250,000,000
Expiration of credit facility	September 2017	September 2017
Proceeds from issuance of debt			400,000,000	300,000,000				500,000,000			300,000,000										400,000,000
Debt repayment using commercial papers														300,000,000					500,000,000					200,000,000
Letter of credit facility, maximum borrowing capacity		1,500,000,000				200,000,000	175,000,000
Interest accrual on foreign currency loans the basis points							Interest accrues on Eurodollar loans at a defined Eurodollar rate, defined as LIBOR plus the applicable percentage, as defined in the revolving credit facility, depending upon the Company's senior, unsecured, (non-credit enhanced) long-term debt rating.
Fair value of the Company's debt	4,443,000,000		4,443,000,000		4,259,000,000
Excess (shortfall) of fair value of debt over (from) carrying value	$ 120,900,000		$ 120,900,000		$ 72,200,000