Segment Information (Schedule Of Revenue from External Customers Attributed to Foreign Countries by Geographic Area) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 24,468	$ 23,784	$ 22,045	$ 20,465	$ 23,785	$ 22,130	$ 21,815	$ 18,893	$ 90,762	$ 86,623	$ 81,698
Non-U.S. [member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									52,920	49,031	44,496
Asia, Other Than China [member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									11,900	12,200	10,390
Europe [member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									11,898	10,622	10,269
China [member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									11,029	10,555	6,086
Middle East [member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									9,243	9,165	10,285
Canada [member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									1,901	1,486	586
Africa [member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									2,596	621	1,282
Oceania [member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									1,757	1,657	2,043
Latin America, Caribbean And Other [member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									2,596	2,725	3,555
United States [member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									$ 37,842	$ 37,592	$ 37,202