Statement of Consolidated Shareholders' Equity (Unaudited) (USD $) In Millions	Total	Comprehensive Income	Series D Preferred Stock	Common Stock	Paid-In Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss)
Beginning Balance at Dec. 31, 2009	$ 15,779		$ 0	$ 215	$ 4,634	$ 11,437	$ (217)	$ (290)
Comprehensive income:
Net income	1,565	1,565				1,565
Commodity hedges, net of income tax expense of $150 and $14 for 2010 and 2011, respectively	313	313						313
Comprehensive income	1,878	1,878
Dividends:
Preferred	(38)
Common stock dividends ($0.30 per share)	(101)					(101)
Common shares issued	13			1	12
Treasury shares issued, net	4				(1)		5
Compensation expense	102				102
Other	1				1
Ending Balance at Jun. 30, 2010	17,676		0	216	4,748	12,901	(212)	23
Beginning Balance at Dec. 31, 2010	24,377		1,227	240	8,864	14,223	(36)	(141)
Comprehensive income:
Net income	2,393	2,393				2,393
Commodity hedges, net of income tax expense of $150 and $14 for 2010 and 2011, respectively	(59)	(59)						(59)
Comprehensive income	2,334	2,334
Dividends:
Preferred	(38)					(38)
Common stock dividends ($0.30 per share)	(115)					(115)
Common shares issued	20			1	19
Treasury shares issued, net	5				2		3
Compensation expense	84				84
Ending Balance at Jun. 30, 2011	$ 26,667		$ 1,227	$ 241	$ 8,969	$ 16,463	$ (33)	$ (200)