Segment Information (Schedule Of Revenues By Geographic Area) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	$ 19,555	$ 17,727	$ 16,543	$ 14,910	$ 16,550	$ 16,967	$ 15,573	$ 15,216	$ 68,735	$ 64,306	$ 68,281
Asia, Other Than China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues by geographical area									7,438	7,288	7,536
China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues by geographical area									4,779	3,109	4,888
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues by geographical area									9,850	7,872	7,516
Middle East [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues by geographical area									5,477	3,685	5,338
Oceania [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues by geographical area									3,067	1,707	1,447
Africa [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues by geographical area									1,759	956	602
Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues by geographical area									618	612	493
Latin America, Caribbean And Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues by geographical area									1,356	930	963
Non-U.S. [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues by geographical area									34,344	26,159	28,783
U.S. [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
United States revenues									$ 34,391	$ 38,147	$ 39,498