Segment Information Revenue From External Customers (Details) (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
Segment information
Revenue from external customers	$ 1,614	$ 1,590	$ 1,586	$ 1,586	$ 1,579	$ 927	$ 913	$ 914	$ 6,376	$ 4,333	$ 3,591
Long-Lived Assets	8,900				8,940				8,900	8,940
North America
Segment information
Revenue from external customers									4,803	3,669	3,275
Long-Lived Assets	5,375				5,338				5,375	5,338
Europe
Segment information
Revenue from external customers									903	502	316
Long-Lived Assets	1,570				1,557				1,570	1,557
United Kingdom
Segment information
Revenue from external customers									628	267	131
Long-Lived Assets	694				613				694	613
Germany
Segment information
Revenue from external customers									79	72	62
Long-Lived Assets	346				348				346	348
Other European Countries
Segment information
Revenue from external customers									196	163	123
Long-Lived Assets	530				596				530	596
Latin America
Segment information
Revenue from external customers									664	158	0
Long-Lived Assets	1,530				1,533				1,530	1,533
Brazil
Segment information
Revenue from external customers									267	68	0
Long-Lived Assets	428				434				428	434
Argentina
Segment information
Revenue from external customers									101	23	0
Long-Lived Assets	377				387				377	387
Colombia
Segment information
Revenue from external customers									104	23	0
Long-Lived Assets	252				247				252	247
Other Latin American Countries
Segment information
Revenue from external customers									192	44	0
Long-Lived Assets	473				465				473	465
Other Countries
Segment information
Revenue from external customers									6	4	0
Long-Lived Assets	$ 425				$ 512				$ 425	$ 512