Subordinated Convertible Debentures (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended	12 Months Ended					1 Months Ended	3 Months Ended	12 Months Ended		3 Months Ended	12 Months Ended		1 Months Ended
	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010		Dec. 31, 2009	Dec. 31, 2011 QUIPS [Member]	Aug. 31, 1998 Unconsolidated Subsidiaries [Member] QUIPS [Member]	Dec. 31, 2011 Unconsolidated Subsidiaries [Member] QUIPS [Member]	Dec. 31, 2011 Unconsolidated Subsidiaries [Member] QUIPS [Member]	Dec. 31, 2010 Unconsolidated Subsidiaries [Member] QUIPS [Member]	Dec. 31, 2011 Six Point Five Percent Subordinated Convertible Debentures [Member]	Dec. 31, 2011 Six Point Five Percent Subordinated Convertible Debentures [Member] Quarter	Dec. 31, 2010 Six Point Five Percent Subordinated Convertible Debentures [Member]	Aug. 31, 1998 Original Terms [Member] Unconsolidated Subsidiaries [Member] QUIPS [Member]	Jul. 31, 2008 Amended Terms [Member] Unconsolidated Subsidiaries [Member] QUIPS [Member]
Debt Instrument [Line Items]
Proceeds from Issuance of Private Placement						$ 300	$ 300
Preferred Stock, Liquidation Preference Per Share						$ 50	$ 50
Stock Conversion Ratio														1.146	1.219
Stock Conversion Price, Per Share														$ 43.63	$ 41.02
Extinguishment of Debt, Amount	814	5	1,273					32	69	22		69	22
Repayments of Debt and Capital Lease Obligations		1,813	3,606		3,658			32	68	9
Gains (Losses) on Extinguishment of Debt	(25)	(3)	(28)	[1]	7						1	(2)	13
Convertible Subordinated Debt, Noncurrent	$ 124	$ 55	$ 124								$ 55	$ 55	$ 124
Debt Instrument, Interest Rate, Stated Percentage											6.50%	6.50%
Number of Consecutive Quarters Quarterly Interest Payments Can Contractually be Deferred												20

[1] The amount of the loss is calculated as the difference between the net carrying amount of the related security and the repurchase price. The net carrying amounts of the securities are less than the principal amounts due to capitalized debt issuance costs and any original issue discount. Aggregate costs of less than $1 and $16 were written off in the years ended December 31, 2011 and 2010, respectively, in connection with the repurchases/redemptions. The $16 of aggregate costs written off in the year ended December 31, 2010 was comprised of $12 of write-offs of debt issuance costs and a $4 write-off of a previously terminated derivative transaction. The losses are reflected in interest expense, net in our consolidated statements of income.