Debt (Long term debt) (Narrative) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		12 Months Ended							12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended				12 Months Ended								12 Months Ended
	Dec. 31, 2010		Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009	Dec. 31, 2011 ABL Facility [Member]	Oct. 31, 2011 ABL Facility [Member]	Dec. 31, 2009 Senior Notes Ten Point Eight Seven Five [Member]	Dec. 31, 2011 Senior Notes Ten Point Eight Seven Five [Member]	Dec. 31, 2009 Senior Notes Nine Point Two Five [Member]	Dec. 31, 2011 Senior Notes Nine Point Two Five [Member]	Dec. 31, 2010 Convertible Senior Subordinated Notes Eight Point Three Seven Five [Member]	Dec. 31, 2011 Convertible Senior Subordinated Notes Eight Point Three Seven Five [Member]	Dec. 31, 2011 1 7/8 percent Convertible Senior Subordinated Notes	Dec. 31, 2011 Convertible Subordinated Notes Four Percent [Member]	Dec. 31, 2009 Convertible Subordinated Notes Four Percent [Member]	Nov. 30, 2009 Convertible Subordinated Notes Four Percent [Member]	Dec. 31, 2011 Six Point Five Percent Subordinated Convertible Debentures [Member]	Dec. 31, 2010 Six Point Five Percent Subordinated Convertible Debentures [Member]	Dec. 31, 2011 7 3/4 percent Senior Subordinated Notes	Dec. 31, 2011 7 percent Senior Subordinated Notes	Jun. 30, 2008 Original Terms [Member] ABL Facility [Member]	Oct. 31, 2008 October 2008 Amendment ABL Facility [Member]	Nov. 30, 2009 November 2009 Amendment ABL Facility [Member]	Oct. 31, 2011 Amended Terms [Member] ABL Facility [Member]	Dec. 31, 2011 Change of Control [Member] Senior Notes Ten Point Eight Seven Five [Member]	Dec. 31, 2011 Change of Control [Member] Senior Notes Nine Point Two Five [Member]	Dec. 31, 2011 Change of Control [Member] Convertible Senior Subordinated Notes Eight Point Three Seven Five [Member]	Dec. 31, 2011 Maximum [Member] Senior Notes Ten Point Eight Seven Five [Member]	Dec. 31, 2011 Maximum [Member] Senior Notes Nine Point Two Five [Member]	Dec. 31, 2011 Maximum [Member] Convertible Senior Subordinated Notes Eight Point Three Seven Five [Member]	Dec. 31, 2011 Minimum [Member] Senior Notes Ten Point Eight Seven Five [Member]	Dec. 31, 2011 Minimum [Member] Senior Notes Nine Point Two Five [Member]	Dec. 31, 2011 Minimum [Member] Convertible Senior Subordinated Notes Eight Point Three Seven Five [Member]	Dec. 31, 2011 Low Range [Member] Convertible Subordinated Notes Four Percent [Member]	Dec. 31, 2011 High Range [Member] Convertible Subordinated Notes Four Percent [Member]	Dec. 31, 2011 Subsidiaries [Member] ABL Facility [Member]	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
Debt Instrument [Line Items]
Convertible Note Hedge Transaction Shares																	15.1
Debt Instrument, Convertible, Number of Equity Instruments																																					7.3	8.4
Debt Conversion, Market Price Per Share																																					$ 30.00	$ 35.00
Short Term Debt Maximum Borrowing Capacity																								$ 1,250	$ 1,285	$ 1,360	$ 1,800
Line Of Credit Facility Incremental Increase									500
Maximum Revolving Credit Amount Percentage								10.00%
Line of Credit Facility, Average Outstanding Amount								707
Debt, Weighted Average Interest Rate								3.10%
Line of Credit Facility, Maximum Month-end Outstanding Amount								810
Debt Instrument, Face Amount											500		500		750	144	168		173																				1,800
Proceeds from Issuance of Long-term Debt										471		480		732		140		167
Debt Instrument, Convertible, Conversion Price																$ 21.83	$ 15.56
Percentage Premium Over Price At Issuance																	75.00%
Closing Price At Issuance																	$ 8.89
Debt Conversion, Converted Instrument, Amount			5														5
Derivative, Cash Received on Hedge																	1
Convertible Note Hedge Transactions, Net																	1	17
Adjustments to Additional Paid in Capital, Other																	7
Long-term Debt, Gross																	168
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt																		33
Proceeds from Convertible Debt																	173
Extinguishment of Debt, Amount	814		5		1,273											93				69	22
Debt Instrument Convertible If Converted Value																	446																							30
Debt Instrument Convertible If Converted Price Per Share																$ 29.55	$ 11.11
Change in Cost to Settle Convertible Debt																1	15
Change in Stock Price to Settle Convertible Debt Per Share																$ 1	$ 1
Debt Instrument Convertible If Converted Value, Non-cash																	278
Debt Conversion, If Converted Instrument, Shares Issued																	9
Debt Conversion, Hedged Converted Instrument, Cash and Non-cash Receivable																	40
Debt Instrument Convertible, Hedged, If Converted Price Per Share																	$ 13.78
Redemption Price Percentage Of Face Value																100.00%	100.00%											101.00%	101.00%	101.00%	105.438%	104.625%	104.188%	100.00%	100.00%	100.00%
Convertible Senior Subordinated Notes																																								22	22
Long Term Debt And Capital Lease Obligations Current And Noncurrent	2,805	[1]	2,987	[1]	2,805	[1]
Debt Instrument, Unamortized Discount											11		7				39
Debt Instrument, Interest Rate, Effective Percentage											11.50%		9.50%				11.60%
Derivative, Cost of Hedge							26											26
Debt Instrument Effective Price At Conversion																	$ 13.70
Credit Facility Term								5 years
Debt Instrument, Interest Rate, Stated Percentage											10.875%		9.25%		8.375%	1.875%	4.00%		4.00%	6.50%		7.75%	7.00%
Debt Terms Reference Amount To Maximum Revolving Credit								$ 150

[1] 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