STATEMENT OF CONSOLIDATED SHAREHOLDERS' EQUITY (USD $) In Millions, unless otherwise specified	Total	Series D Preferred Stock	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
BEGINNING BALANCE at Dec. 31, 2010	$ 24,377	$ 1,227	$ 240	$ 8,864	$ 14,223	$ (36)	$ (141)
Net income	3,395				3,395
Commodity hedges, net of tax	203						203
Dividends:
Preferred	(57)				(57)
Common ($0.45 and $0.51 per share for 2011 and 2012 respectively)	(173)				(173)
Common stock activity, net	29		1	28
Treasury stock activity, net	6			2		4
Compensation expense	125			125
Other	(2)			(2)
ENDING BALANCE at Sep. 30, 2011	27,903	1,227	241	9,017	17,388	(32)	62
BEGINNING BALANCE at Dec. 31, 2011	28,993	1,227	241	9,066	18,500	(32)	(9)
Net income	1,333				1,333
Commodity hedges, net of tax	(80)						(80)
Dividends:
Preferred	(57)				(57)
Common ($0.45 and $0.51 per share for 2011 and 2012 respectively)	(198)				(198)
Common shares issued	601		3	598
Common stock activity, net	(11)		1	(12)
Treasury stock activity, net	3			1		2
Compensation expense	130			130
ENDING BALANCE at Sep. 30, 2012	$ 30,714	$ 1,227	$ 245	$ 9,783	$ 19,578	$ (30)	$ (89)