Debt (Schedule of long term debt) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified																																					12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2011 Accounts Receivable Securitization Facility [Member]	Dec. 31, 2011 $1.80 billion ABL Facility	Dec. 31, 2011 10 7/8 percent Senior Notes	Dec. 31, 2011 9 1/4 percent Senior Notes	Dec. 31, 2011 8 3/8 percent Senior Subordinated Notes	Dec. 31, 2011 1 7/8 percent Convertible Senior Subordinated Notes	Dec. 31, 2011 4 percent Convertible Senior Notes	Nov. 30, 2009 4 percent Convertible Senior Notes	Dec. 31, 2011 Subsidiaries [Member]	Dec. 31, 2010 Subsidiaries [Member]	Dec. 31, 2011 Subsidiaries [Member] Accounts Receivable Securitization Facility [Member]		Dec. 31, 2010 Subsidiaries [Member] Accounts Receivable Securitization Facility [Member]		Dec. 31, 2011 Subsidiaries [Member] $1.80 billion ABL Facility		Dec. 31, 2010 Subsidiaries [Member] $1.80 billion ABL Facility		Dec. 31, 2011 Subsidiaries [Member] 10 7/8 percent Senior Notes	Dec. 31, 2010 Subsidiaries [Member] 10 7/8 percent Senior Notes	Dec. 31, 2011 Subsidiaries [Member] 9 1/4 percent Senior Notes	Dec. 31, 2010 Subsidiaries [Member] 9 1/4 percent Senior Notes	Dec. 31, 2011 Subsidiaries [Member] 8 3/8 percent Senior Subordinated Notes	Dec. 31, 2010 Subsidiaries [Member] 8 3/8 percent Senior Subordinated Notes	Dec. 31, 2011 Subsidiaries [Member] 1 7/8 percent Convertible Senior Subordinated Notes	Dec. 31, 2010 Subsidiaries [Member] 1 7/8 percent Convertible Senior Subordinated Notes	Dec. 31, 2011 Subsidiaries [Member] Capital leases	Dec. 31, 2010 Subsidiaries [Member] Capital leases	Dec. 31, 2011 Parent Company [Member]	Dec. 31, 2010 Parent Company [Member]	Dec. 31, 2011 Parent Company [Member] 4 percent Convertible Senior Notes	Dec. 31, 2010 Parent Company [Member] 4 percent Convertible Senior Notes	Dec. 31, 2011 QUIPS [Member]
Debt Instrument [Line Items]
Secured Debt															$ 255	[1]	$ 221	[1]	$ 810	[1]	$ 683	[1]
Senior Notes																							489	488	493	492
Senior Subordinated Notes																											750	750
Convertible Senior Subordinated Notes																													22	22
Capital leases																															39	25
Total URNA and subsidiaries debt													2,858	2,681
Convertible Senior Notes																																			129	124
Total debt	2,987	[2]	2,805	[2]
Less short-term portion	(395)		(229)																														(129)	0
Total long-term debt	2,592		2,576																														0	124
Debt Instrument, Face Amount							500	500	750	144	168	173							1,800
Debt Instrument, Unused Borrowing Capacity, Amount					7	929
Letters of Credit Outstanding, Amount						50
Debt Instrument, Interest Rate at Period End					0.90%	2.40%
Proceeds from Issuance of Private Placement																																					300
Preferred Stock, Liquidation Preference Per Share																																					$ 50
Convertible Subordinated Debt, Noncurrent	$ 55		$ 124																														$ 55	$ 124

[1] $929 and $7 were available under our ABL facility and accounts receivable securitization facility, respectively, at December 31, 2011. The ABL facility availability is reflected net of $50 of letters of credit. At December 31, 2011, the interest rates applicable to our ABL facility and accounts receivable securitization facility were 2.4 percent and 0.9 percent, respectively.

[2] In August 1998, a subsidiary trust of Holdings (the “Trust”) issued and sold $300 of 6 1/2 percent Convertible Quarterly Income Preferred Securities (“QUIPS”) in a private offering. The Trust used the proceeds from the offering to purchase 6 1/2 percent subordinated convertible debentures due 2028 (the “Debentures”), which resulted in Holdings receiving all of the net proceeds of the offering. The QUIPS are non-voting securities, carry a liquidation value of $50 (fifty dollars) per security and are convertible into Holdings’ common stock. Total long-term debt at December 31, 2011 and 2010 excludes $55 and $124 of these Debentures, respectively, which are separately classified in our consolidated balance sheets and referred to as “subordinated convertible debentures.” The subordinated convertible debentures reflect the obligation to our subsidiary that has issued the QUIPS. This subsidiary is not consolidated in our financial statements because we are not the primary beneficiary of the Trust. See note 13 (“Subordinated Convertible Debentures”) for additional detail. S