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Consolidated Statements of Changes in Equity (Parenthetical) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Dividends per share	$ 0.60	$ 0.60	$ 0.60
Accumulated Other Comprehensive Loss
Tax effect on defined benefit pension plans	$ 44	$ (5)	$ 2
Retained Earnings
Dividends per share	$ 0.60	$ 0.60	$ 0.60

Tax effects of the increase (decrease) to accumulated comprehensive income during the period related to benefit plans. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.

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