Debt (Schedule of Long Term Debt) (Details) (USD $)	12 Months Ended					1 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012	Apr. 30, 2014	Oct. 31, 2012	Mar. 31, 2012	Mar. 31, 2014	Oct. 31, 2010	Nov. 30, 2009
Debt Instrument [Line Items]
Total debt	$ 8,052,000,000		$ 7,173,000,000
Less short-term portion	(618,000,000)		(604,000,000)
Long-term debt	7,434,000,000		6,569,000,000
Gains (losses) on extinguishment of debt	(80,000,000)		(1,000,000)		(72,000,000)
Accounts Receivable Securitization Facility
Debt Instrument [Line Items]
Unused borrowing capacity amount	2,000,000
Interest rate at period end	0.80%
$2.3 billion ABL Facility
Debt Instrument [Line Items]
Unused borrowing capacity amount	946,000,000
Letters of credit outstanding	50,000,000
Interest rate at period end	2.20%
5 3/4 percent Senior Secured Notes
Debt Instrument [Line Items]
Stated interest rate	5.75%
9 1/4 and 10 1/4 Senior Notes
Debt Instrument [Line Items]
Gains (losses) on extinguishment of debt	(70,000,000)
10 1/4 percent Senior Notes
Debt Instrument [Line Items]
Stated interest rate	10.25%
9 1/4 percent Senior Notes
Debt Instrument [Line Items]
Stated interest rate	9.25%
Gains (losses) on extinguishment of debt						64,000,000
7 3/8 percent Senior Notes
Debt Instrument [Line Items]
Stated interest rate	7.375%
8 3/8 percent Senior Subordinated Notes
Debt Instrument [Line Items]
Stated interest rate	8.375%
8 1/4 percent Senior Notes
Debt Instrument [Line Items]
Stated interest rate	8.25%
7 5/8 percent Senior Notes
Debt Instrument [Line Items]
Stated interest rate	7.625%
6 1/8 percent Senior Notes
Debt Instrument [Line Items]
Stated interest rate	6.125%
Debt instrument, face amount							400,000,000
5 3/4 percent Senior Notes
Debt Instrument [Line Items]
Stated interest rate	5.75%
4 percent Convertible Senior Notes
Debt Instrument [Line Items]
Stated interest rate	4.00%		4.00%		4.00%
URNA and subsidiaries
Debt Instrument [Line Items]
Total debt	8,020,000,000		7,037,000,000
URNA and subsidiaries | Capital leases
Debt Instrument [Line Items]
Total debt	105,000,000	[1]	120,000,000	[1]
Credit facility | URNA and subsidiaries | $2.3 billion ABL Facility
Debt Instrument [Line Items]
Total debt	1,304,000,000	[2]	1,106,000,000	[2]
Senior secured notes | 5 3/4 percent Senior Secured Notes
Debt Instrument [Line Items]
Debt instrument, face amount								750,000,000
Senior secured notes | URNA and subsidiaries | 5 3/4 percent Senior Secured Notes
Debt Instrument [Line Items]
Total debt	750,000,000	[3]	750,000,000	[3]
Senior notes | 7 3/8 percent Senior Notes
Debt Instrument [Line Items]
Debt instrument, face amount								750,000,000
Senior notes | 7 5/8 percent Senior Notes
Debt Instrument [Line Items]
Debt instrument, face amount								1,325,000,000
Senior notes | 6 1/8 percent Senior Notes
Debt Instrument [Line Items]
Debt instrument, face amount	925,000,000
Senior notes | 5 3/4 percent Senior Notes
Debt Instrument [Line Items]
Total debt	850,000,000	[4]	0	[4]
Debt instrument, face amount									850,000,000
Senior notes | URNA and subsidiaries | 10 1/4 percent Senior Notes
Debt Instrument [Line Items]
Total debt	0	[1],[5]	220,000,000	[1],[5]
Senior notes | URNA and subsidiaries | 9 1/4 percent Senior Notes
Debt Instrument [Line Items]
Total debt	0	[5]	494,000,000	[5]
Senior notes | URNA and subsidiaries | 7 3/8 percent Senior Notes
Debt Instrument [Line Items]
Total debt	750,000,000	[3]	750,000,000	[3]
Senior notes | URNA and subsidiaries | 8 1/4 percent Senior Notes
Debt Instrument [Line Items]
Total debt	687,000,000	[1]	692,000,000	[1]
Senior notes | URNA and subsidiaries | 7 5/8 percent Senior Notes
Debt Instrument [Line Items]
Total debt	1,325,000,000	[3]	1,325,000,000	[3]
Senior notes | URNA and subsidiaries | 6 1/8 percent Senior Notes
Debt Instrument [Line Items]
Total debt	951,000,000	[4]	400,000,000	[4]
Senior subordinated notes | 8 3/8 percent Senior Subordinated Notes
Debt Instrument [Line Items]
Debt instrument, face amount										750,000,000
Senior subordinated notes | URNA and subsidiaries | 8 3/8 percent Senior Subordinated Notes
Debt Instrument [Line Items]
Total debt	750,000,000		750,000,000
Accounts receivable facility | URNA and subsidiaries | Accounts Receivable Securitization Facility
Debt Instrument [Line Items]
Total debt	548,000,000	[2]	430,000,000	[2]
Convertible debt | 4 percent Convertible Senior Notes
Debt Instrument [Line Items]
Total debt	32,000,000		136,000,000
Stated interest rate	4.00%		4.00%		4.00%						4.00%
Debt instrument, face amount	$ 34,000,000										$ 173,000,000

[1] Upon consummation of the RSC merger, we assumed certain of RSC's debt, including capital leases. See below for additional detail regarding the assumed RSC debt.

[2] $946 and $2 were available under our ABL facility and accounts receivable securitization facility, respectively, at December 31, 2014. The ABL facility availability is reflected net of $50 of letters of credit. At December 31, 2014, the interest rates applicable to our ABL facility and accounts receivable securitization facility were 2.2 percent and 0.8 percent, respectively.

[3] In connection with the RSC merger, on March 9, 2012, we issued the merger financing notes. See below for additional detail regarding each of the merger financing notes.

[4] Contemporaneous with the National Pump acquisition discussed in note 3 to our consolidated financial statements, in 2014, URNA issued $525 principal amount of 6 1/8 percent Senior Notes as an add on to our existing 6 1/8 percent Senior Notes and $850 principal amount of 5 3/4 percent Senior Notes. See below for additional detail.

[5] During 2014, we redeemed all of our 10 1/4 percent Senior Notes and 9 1/4 percent Senior Notes. The 10 1/4 percent Senior Notes were part of the debt assumed upon consummation of the RSC merger. Upon redemption, we recognized an aggregate loss of $70 in interest expense, net. The loss represented the difference between the net carrying amount and the total purchase price of the notes.