Long-Term Incentive Plans (Outstanding Stock Options) (Details) (USD $) In Millions, except Share data, unless otherwise specified							12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Mar. 31, 2010	Dec. 31, 2009	Mar. 31, 2009	Dec. 31, 2008	Dec. 31, 2011 $4.02-$12.50 [Member]	Dec. 31, 2011 $36.69-$55.60 [Member]	Dec. 31, 2011 $57.10-$70.86 [Member]	Dec. 31, 2011 Exercisable [Member]	Dec. 31, 2011 Exercisable [Member] $4.02-$12.50 [Member]	Dec. 31, 2011 Exercisable [Member] $36.69-$55.60 [Member]	Dec. 31, 2011 Exercisable [Member] $57.10-$70.86 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum							$ 4.02	$ 36.69	$ 57.10
Range of Exercise Prices, Maximum							$ 12.50	$ 55.60	$ 70.86
Number of Options	6,425,073	6,650,947		7,044,820		6,312,194	4,550,000	838,632	1,036,441
Weighted Average Remaining Contractual Life in Years	3.40						4.03	0.75	2.78
Weighted Average Exercise Price	$ 21.3330	$ 22.1713		$ 25.3110		$ 34.9822	$ 7.8101	$ 44.9540	$ 61.5861
Aggregate Intrinsic Value	$ 19						$ 19
Number of Options	2,211,878	2,050,252		2,006,620			350,000	835,437	1,026,441
Weighted Average Remaining Contractual Life in Years, Stock Options Exercisable										2.21	4.12	0.75	2.76
Weighted Average Exercise Price	$ 46.1478	$ 53.1172	$ 5.05	$ 50.0301	$ 4.02					$ 46.1478	$ 4.0200	$ 44.9401	$ 61.4958
Aggregate Intrinsic Value, Stock Options Exercisable										$ 3	$ 3