Geographic Information Table (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Schedule Of Geographical Information [Line Items]
Revenues from external customers	$ 7,964	[1]	$ 7,363	[1]	$ 7,205	[1]
Long-lived assets	1,316	[2]	1,261	[2]	1,160	[2]
Total assets	3,830		3,608		3,337
United States
Schedule Of Geographical Information [Line Items]
Revenues from external customers	3,144	[1]	2,975	[1]	2,795	[1]
Long-lived assets	448	[2]	429	[2]	359	[2]
Total assets	1,552		1,521		1,280
Germany
Schedule Of Geographical Information [Line Items]
Revenues from external customers	941	[1]	817	[1]	826	[1]
Long-lived assets	120	[2]	115	[2]	110	[2]
Total assets	358		344		347
Canada
Schedule Of Geographical Information [Line Items]
Revenues from external customers	387	[1]	389	[1]	343	[1]
Long-lived assets	59	[2]	57	[2]	57	[2]
Total assets	182		168		163
China
Schedule Of Geographical Information [Line Items]
Revenues from external customers	875	[1]	661	[1]	567	[1]
Long-lived assets	158	[2]	139	[2]	104	[2]
Total assets	602		448		387
Other Foreign
Schedule Of Geographical Information [Line Items]
Revenues from external customers	2,617	[1],[3]	2,521	[1],[3]	2,674	[1],[3]
Long-lived assets	531	[2],[3]	521	[2],[3]	530	[2],[3]
Total assets	1,326	[3]	1,307	[3]	1,251	[3]
Reclass & Elims
Schedule Of Geographical Information [Line Items]
Total assets	$ (190)		$ (180)		$ (91)

[1] Revenues are attributed to countries based on location of the shipper.

[2] Long-lived assets include all long-term assets except goodwill, intangibles and deferred tax assets.

[3] Revenues from external customers and long-lived assets for individual foreign countries other than Germany, Canada, and China are not material.