Statement of Consolidated Shareholders' Equity (Parenthetical) (Unaudited) (USD $) In Millions, except Per Share data	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Comprehensive income:
Income tax benefit to commodity hedges	$ 14	$ 150
Dividends:
Common stock, dividends, per share	$ 0.30	$ 0.30
Comprehensive Income
Comprehensive income:
Income tax benefit to commodity hedges	14	150
Retained Earnings
Dividends:
Common stock, dividends, per share	$ 0.30	$ 0.30
Accumulated Other Comprehensive Income (Loss)
Comprehensive income:
Income tax benefit to commodity hedges	$ 14	$ 150