Business Segments (Schedule of Revenue and Long-Lived Assets, By Geographical Area) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended										12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012		Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Revenues from External Customers and Long-Lived Assets [Line Items]
Consolidated long-lived assets	$ 81,362					$ 81,611					$ 81,362		$ 81,611		$ 48,532
Consolidated revenue	6,112		6,709	5,879	5,898	5,695		6,722	3,577	3,630	24,598		19,624		14,529
U.S. [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Consolidated long-lived assets	78,581					79,144					78,581		79,144		45,920
Consolidated revenue											23,053		18,078		13,062
Latin America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Consolidated long-lived assets	2,781	[1]				2,467	[1]				2,781	[1]	2,467	[1]	2,612	[1]
Consolidated revenue											$ 1,545	[1]	$ 1,546	[1]	$ 1,467	[1]

[1] Change in amounts of long-lived assets in Latin America includes foreign currency translation adjustments on property, plant and equipment and other long-lived asset balances.