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.