Segment Information Segment Information, Geographic Information by Country for Revenue and Long-Lived Assets (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
Operating revenues by geographic area
Operating revenues	$ 34,673	[1]	$ 33,713	[2]	$ 31,293	$ 26,308	$ 22,164	$ 21,015	$ 20,561	$ 18,493	$ 125,987	$ 82,233	$ 64,599
Major customer amount											0	0	0
Geographic information by country for long-lived assets
Total long-lived assets	26,485						23,777				26,485	23,777
United States [Member]
Operating revenues by geographic area
Operating revenues											98,806	67,392	55,247
Geographic information by country for long-lived assets
United States	22,317						20,488				22,317	20,488
Canada [Member]
Operating revenues by geographic area
Operating revenues											10,110	6,945	6,048
Geographic information by country for long-lived assets
Foreign Countries	2,362						2,308				2,362	2,308
United Kingdom [Member]
Operating revenues by geographic area
Operating revenues											4,297	149	0
Geographic information by country for long-lived assets
Foreign Countries	848						0				848	0
Aruba [Member]
Geographic information by country for long-lived assets
Foreign Countries	958						981				958	981
Other Countries [Member]
Operating revenues by geographic area
Operating revenues											$ 12,774	$ 7,747	$ 3,304

[1] Includes the operations related to the Meraux Acquisition beginning October 1, 2011.

[2] Includes the operations related to the Pembroke Acquisition beginning August 1, 2011.