Consolidated Statements of Shareholders' Equity (Deficit) (Parenthetical) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Tax benefit/expense from other comprehensive gains (loss), pension liability	$ 64	$ 6	$ 20
Dividends paid per share	$ 5.20	$ 4.25	$ 3.84
Comprehensive Income (Loss)
Tax benefit/expense from other comprehensive gains (loss), pension liability	64	6	20
Retained Earnings
Dividends paid per share	$ 5.20	$ 4.25	$ 3.84
Accumulated Other Comprehensive Loss
Tax benefit/expense from other comprehensive gains (loss), pension liability	$ 64	$ 6	$ 20