Schedule of Committed Credit Facilities (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012
Revolving Credit Facility Maturing 2016
Line of Credit Facility [Line Items]
Total Capacity	$ 1,500	[1],[2]
Letters of Credit Issued	631	[1],[2]
Available Capacity	869	[1],[2]
Other Facilities
Line of Credit Facility [Line Items]
Total Capacity	10	[3]
Outstanding Borrowings	4	[3]
Available Capacity	$ 6	[3]

[1] This revolving credit facility matures in May 2016 and bears interest of one month LIBOR plus 300 basis points.

[2] The senior credit facility, which encompasses the floating rate term loans and the revolving credit facility, is secured by pledges of all of the capital stock of all of the Company's domestic subsidiaries and up to 66% of the capital stock of each foreign subsidiary directly owned by the Company's domestic subsidiaries, subject to certain exceptions, and liens on substantially all of the Company's intellectual property and certain other real and personal property.

[3] These facilities encompass bank overdraft lines of credit and finance leases, bearing interest of 3.22% to 5.77% as of December 31, 2012.