Debt and Subordinated Convertible Debentures (Schedule of long-term debt instruments) (Details) (USD $)	9 Months Ended					9 Months Ended												9 Months Ended																																				1 Months Ended
	Sep. 30, 2013		Sep. 30, 2012	Dec. 31, 2012		Sep. 30, 2013 Accounts Receivable Securitization Facility [Member]	Sep. 30, 2013 1.9 billion dollar ABL Facility [Member]	Sep. 30, 2013 5 3/4 percent Senior Secured Notes [Member]	Sep. 30, 2013 10 1/4 percent Senior Notes [Member]	Sep. 30, 2013 9 1/4 percent Senior Notes [Member]	Sep. 30, 2013 7 3/8 percent Senior Notes [Member]	Sep. 30, 2013 8 3/8 percent Senior Subordinated Notes [Member]	Sep. 30, 2013 8 1/4 percent Senior Notes [Member]	Sep. 30, 2013 7 5/8 percent Senior Notes [Member]	Sep. 30, 2013 6 1/8 percent Senior Notes [Member]	Sep. 30, 2013 4 percent Convertible Subordinated Notes [Member]	Nov. 30, 2009 4 percent Convertible Subordinated Notes [Member]	Sep. 30, 2013 6 1/2 percent Subordinated Convertible Debentures [Member]	Dec. 31, 2012 6 1/2 percent Subordinated Convertible Debentures [Member]	Sep. 30, 2013 Subsidiaries [Member] Accounts Receivable Securitization Facility [Member]		Dec. 31, 2012 Subsidiaries [Member] Accounts Receivable Securitization Facility [Member]		Sep. 30, 2013 Subsidiaries [Member] 1.9 billion dollar ABL Facility [Member]		Dec. 31, 2012 Subsidiaries [Member] 1.9 billion dollar ABL Facility [Member]		Sep. 30, 2013 Subsidiaries [Member] 5 3/4 percent Senior Secured Notes [Member]	Dec. 31, 2012 Subsidiaries [Member] 5 3/4 percent Senior Secured Notes [Member]	Sep. 30, 2013 Subsidiaries [Member] 10 1/4 percent Senior Notes [Member]	Dec. 31, 2012 Subsidiaries [Member] 10 1/4 percent Senior Notes [Member]	Sep. 30, 2013 Subsidiaries [Member] 9 1/4 percent Senior Notes [Member]	Dec. 31, 2012 Subsidiaries [Member] 9 1/4 percent Senior Notes [Member]	Sep. 30, 2013 Subsidiaries [Member] 7 3/8 percent Senior Notes [Member]	Dec. 31, 2012 Subsidiaries [Member] 7 3/8 percent Senior Notes [Member]	Sep. 30, 2013 Subsidiaries [Member] 8 3/8 percent Senior Subordinated Notes [Member]	Dec. 31, 2012 Subsidiaries [Member] 8 3/8 percent Senior Subordinated Notes [Member]	Sep. 30, 2013 Subsidiaries [Member] 8 1/4 percent Senior Notes [Member]	Dec. 31, 2012 Subsidiaries [Member] 8 1/4 percent Senior Notes [Member]	Sep. 30, 2013 Subsidiaries [Member] 7 5/8 percent Senior Notes [Member]	Dec. 31, 2012 Subsidiaries [Member] 7 5/8 percent Senior Notes [Member]	Sep. 30, 2013 Subsidiaries [Member] 6 1/8 percent Senior Notes [Member]	Dec. 31, 2012 Subsidiaries [Member] 6 1/8 percent Senior Notes [Member]	Sep. 30, 2013 Subsidiaries [Member] Capital Leases [Member]	Dec. 31, 2012 Subsidiaries [Member] Capital Leases [Member]	Sep. 30, 2013 Subsidiaries [Member] Total URNA and subsidiaries debt [Member]	Dec. 31, 2012 Subsidiaries [Member] Total URNA and subsidiaries debt [Member]	Sep. 30, 2013 Parent Company [Member]	Dec. 31, 2012 Parent Company [Member]	Sep. 30, 2013 Parent Company [Member] 4 percent Convertible Subordinated Notes [Member]		Dec. 31, 2012 Parent Company [Member] 4 percent Convertible Subordinated Notes [Member]		Aug. 31, 1998 QUIPS [Member]	Sep. 30, 2013 QUIPS [Member]	Dec. 31, 2012 Original Terms [Member] Accounts Receivable Securitization Facility [Member]	Sep. 30, 2013 Amended Terms [Member] Accounts Receivable Securitization Facility [Member]
Debt Instrument [Line Items]
Total debt	$ 7,582,000,000	[1]		$ 7,309,000,000	[1]															$ 462,000,000	[2]	$ 453,000,000	[2]	$ 1,478,000,000	[3]	$ 1,184,000,000	[3]	$ 750,000,000	$ 750,000,000	$ 221,000,000	$ 223,000,000	$ 494,000,000	$ 494,000,000	$ 750,000,000	$ 750,000,000	$ 750,000,000	$ 750,000,000	$ 693,000,000	$ 695,000,000	$ 1,325,000,000	$ 1,325,000,000	$ 400,000,000	$ 400,000,000	$ 125,000,000	$ 148,000,000	$ 7,448,000,000	$ 7,172,000,000			$ 134,000,000	[4]	$ 137,000,000	[4]
Less short-term portion	(630,000,000)	[5]		(630,000,000)	[5]																																											(134,000,000)	(137,000,000)
Total long-term debt	6,952,000,000			6,679,000,000																																												0	0
Stated interest rate								5.75%	10.25%	9.25%	7.375%	8.375%	8.25%	7.625%	6.125%	4.00%		6.50%
Face amount																156,000,000	173,000,000							1,900,000,000.0
Maximum borrowing capacity																																																								475,000,000	550,000,000
Unused borrowing capacity under facility						29,000,000	370,000,000
Interest rate at end of period						0.90%	2.20%
Average outstanding amount under facility						443,000,000
Weighted average interest rate						0.80%	2.30%
A/R Securitization maximum month-end outstanding amount						493,000,000
Collateral amount						491,000,000
Letters of credit outstanding							52,000,000
Average outstanding amount							1,167,000,000
ABL Facility maximum month-end outstanding amount							1,478,000,000
Unamortized discount																22,000,000
Convertible, conversion price (in dollars per share)																$ 11.11
Proceeds from Issuance of Private Placement																																																						300,000,000
Liquidation value (in dollars per security)																																																							$ 50
Extinguishment of debt																		55,000,000
Loss on retirement of subordinated convertible debentures	2,000,000		0															2,000,000
Subordinated convertible debentures	$ 0			$ 55,000,000															$ 55,000,000																														$ 55,000,000

[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 were non-voting securities, carried a liquidation value of $50 (fifty dollars) per security and were convertible into Holdings’ common stock. During the nine months ended September 30, 2013, an aggregate of $55 of QUIPS was redeemed. As of September 30, 2013, there were no QUIPS outstanding. In connection with these redemptions, during the nine months ended September 30, 2013, we retired $55 principal amount of our subordinated convertible debentures and recognized a loss of $2, inclusive of the write-off of capitalized debt issuance costs. This loss is reflected in interest expense-subordinated convertible debentures in our condensed consolidated statements of income. As of September 30, 2013, there were no subordinated convertible debentures outstanding. Total debt at December 31, 2012 excludes $55 of these Debentures, which were separately classified in our condensed consolidated balance sheets and referred to as “subordinated convertible debentures.” The subordinated convertible debentures reflected the obligation to our subsidiary that issued the QUIPS. As of December 31, 2012, this subsidiary was not consolidated in our financial statements because we were not the primary beneficiary of the Trust. As of September 30, 2013, the Trust was liquidated.

[2] In February 2013, we amended our accounts receivable securitization facility to increase the facility size from $475 to $550. An additional purchaser was also added to the facility, and the facility was not otherwise amended. In September 2013, we renewed the facility which now expires on September 18, 2014. At September 30, 2013, $29 was available under our accounts receivable securitization facility. The interest rate applicable to the accounts receivable securitization facility was 0.9 percent at September 30, 2013. During the nine months ended September 30, 2013, the monthly average amount outstanding under the accounts receivable securitization facility, including the former facility and the amended facility, was $443, and the weighted-average interest rate thereon was 0.8 percent. The maximum month-end amount outstanding under the accounts receivable securitization facility, including the former facility and the amended facility, during the nine months ended September 30, 2013 was $493. Borrowings under the accounts receivable securitization facility are permitted only to the extent that the face amount of the receivables in the collateral pool, net of applicable reserves, exceeds the outstanding loans. As of September 30, 2013, there were $491 of receivables, net of applicable reserves, in the collateral pool.

[3] In June 2013, our ABL facility was amended to reduce the minimum borrowing period and to increase the number of available loan tranches. At September 30, 2013, $370 was available under our ABL facility, net of $52 of letters of credit. The interest rate applicable to the ABL facility was 2.2 percent at September 30, 2013. During the nine months ended September 30, 2013, the monthly average amount outstanding under the ABL facility was $1,167, and the weighted-average interest rate thereon was 2.3 percent. The maximum month-end amount outstanding under the ABL facility during the nine months ended September 30, 2013 was $1,478.

[4] The difference between the September 30, 2013 carrying value of the 4 percent Convertible Senior Notes and the $156 principal amount reflects the $22 unamortized portion of the original issue discount recognized upon issuance of the notes, which is being amortized through the maturity date of November 15, 2015. Because the 4 percent Convertible Senior Notes were redeemable at September 30, 2013, an amount equal to the $22 unamortized portion of the original issue discount is separately classified in our condensed consolidated balance sheets and referred to as “temporary equity.” Based on the price of our common stock during the third quarter of 2013, holders of the 4 percent Convertible Senior Notes have the right to redeem the notes during the fourth quarter of 2013 at a conversion price of $11.11 per share of common stock. Since October 1, 2013 (the beginning of the fourth quarter), none of the 4 percent Convertible Senior Notes were redeemed.

[5] As of September 30, 2013, our short-term debt primarily reflects $462 of borrowings under our accounts receivable securitization facility and $134 of 4 percent Convertible Senior Notes. The 4 percent Convertible Senior Notes mature in 2015, but are reflected as short-term debt because they are redeemable at September 30, 2013.