Segment and Geographic Area Information - Schedule of Geographic Information for Sales (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales	$ 5,898	$ 5,833	$ 5,963	$ 6,006	$ 5,989	$ 6,419	$ 6,585	$ 5,958	$ 23,700	$ 24,951	$ 21,013
U.S. [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales									12,361	12,295	10,560
Australia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales									3,222	3,587	2,842
Brazil [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales									1,244	1,371	1,182
Spain [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales									1,203	1,487	1,234
Netherlands [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales									949	1,025	940
Norway [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales									820	927	809
France [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales									807	825	662
Russia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales									713	761	584
Hungary [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales									492	665	505
United Kingdom [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales									438	412	331
Italy [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales									379	537	418
China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales									326	283	188
Germany [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales									216	229	231
Other Geographical Regions [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales									$ 530	$ 547	$ 527