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Debt (Long Term Debt Narrative) (Details) - USD ($)
1 Months Ended 12 Months Ended 18 Months Ended
Nov. 30, 2016
May 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Oct. 31, 2012
Mar. 31, 2012
Jun. 30, 2008
Dec. 31, 2016
Mar. 31, 2014
Dec. 31, 2015
$2.5 billion ABL Facility                    
Debt Instrument [Line Items]                    
Line of credit facility, maximum borrowing capacity               $ 2,500,000,000.0   $ 2,500,000,000.0
Maximum revolving credit amount percentage               10.00%    
$2.5 billion ABL Facility | Credit facility | Line of credit                    
Debt Instrument [Line Items]                    
Debt instrument, term             5 years      
Line of credit facility, maximum borrowing capacity             $ 1,250,000,000.000 $ 2,500,000,000.0    
Line of credit facility, average outstanding amount               $ 1,400,000,000    
Line of credit facility, interest rate during period               2.10%    
Line of credit facility, maximum month-end outstanding amount               $ 1,700,000,000    
7 5/8 percent Senior Notes | Senior notes                    
Debt Instrument [Line Items]                    
Debt instrument, face amount           $ 1,325,000,000        
Proceeds from issuance of long-term debt           $ 1,295,000,000        
Redemption of principal amount of debt               850,000,000    
Outstanding principal amount of debt               475,000,000    
Debt redemption percentage           101.00%        
7 5/8 percent Senior Notes | Senior notes | Period commencing in 2017                    
Debt Instrument [Line Items]                    
Debt redemption percentage           103.813%        
7 5/8 percent Senior Notes | Senior notes | Period commencing in 2020                    
Debt Instrument [Line Items]                    
Debt redemption percentage           100.00%        
6 1/8 percent Senior Notes | Senior notes                    
Debt Instrument [Line Items]                    
Debt instrument, face amount         $ 400,000,000          
Proceeds from issuance of long-term debt                 $ 939,000,000  
Debt redemption percentage         101.00%          
Debt instrument, unamortized premium               $ 21,000,000    
Effective interest rate               5.70%    
6 1/8 percent Senior Notes | Senior notes | Period commencing in 2017                    
Debt Instrument [Line Items]                    
Debt redemption percentage       103.063%            
6 1/8 percent Senior Notes | Senior notes | Period commencing in 2020                    
Debt Instrument [Line Items]                    
Debt redemption percentage       100.00%            
Add-on to Senior Notes 6 1/8 percent | Senior notes                    
Debt Instrument [Line Items]                    
Debt instrument, face amount       $ 525,000,000         525,000,000  
4 5/8 percent Senior Secured Notes | Senior secured notes                    
Debt Instrument [Line Items]                    
Debt instrument, face amount     $ 1,000,000,000              
Proceeds from issuance of long-term debt     $ 990,000,000              
Debt redemption percentage     101.00%              
4 5/8 percent Senior Secured Notes | Senior secured notes | Period commencing in 2018                    
Debt Instrument [Line Items]                    
Debt redemption percentage     103.469%              
4 5/8 percent Senior Secured Notes | Senior secured notes | Period commencing in 2021                    
Debt Instrument [Line Items]                    
Debt redemption percentage     100.00%              
5 3/4 percent Senior Notes | Senior notes                    
Debt Instrument [Line Items]                    
Debt instrument, face amount       850,000,000         $ 850,000,000  
Proceeds from issuance of long-term debt       $ 837,000,000            
Debt redemption percentage       101.00%            
5 3/4 percent Senior Notes | Senior notes | Period commencing in 2019                    
Debt Instrument [Line Items]                    
Debt redemption percentage       102.875%            
5 3/4 percent Senior Notes | Senior notes | Period commencing in 2022                    
Debt Instrument [Line Items]                    
Debt redemption percentage       100.00%            
5 1/2 percent Senior Notes due 2025 | Senior notes                    
Debt Instrument [Line Items]                    
Debt instrument, face amount     $ 800,000,000              
Proceeds from issuance of long-term debt     $ 792,000,000              
Debt redemption percentage     101.00%              
5 1/2 percent Senior Notes due 2025 | Senior notes | Period commencing in 2020                    
Debt Instrument [Line Items]                    
Debt redemption percentage     102.75%              
5 1/2 percent Senior Notes due 2025 | Senior notes | Period commencing in 2023                    
Debt Instrument [Line Items]                    
Debt redemption percentage     100.00%              
5 7/8 percent Senior Notes | Senior notes                    
Debt Instrument [Line Items]                    
Debt instrument, face amount   $ 750,000,000                
Proceeds from issuance of long-term debt   $ 741,000,000                
Debt redemption percentage   101.00%                
5 7/8 percent Senior Notes | Senior notes | Period commencing in 2021                    
Debt Instrument [Line Items]                    
Debt redemption percentage   102.938%                
5 7/8 percent Senior Notes | Senior notes | Period commencing in 2024                    
Debt Instrument [Line Items]                    
Debt redemption percentage   100.00%                
5 1/2 percent Senior Notes due 2027 | Senior notes                    
Debt Instrument [Line Items]                    
Debt instrument, face amount $ 750,000,000                  
Proceeds from issuance of long-term debt $ 741,000,000                  
Debt redemption percentage 101.00%                  
5 1/2 percent Senior Notes due 2027 | Senior notes | Period commencing in 2022                    
Debt Instrument [Line Items]                    
Debt redemption percentage 102.75%                  
5 1/2 percent Senior Notes due 2027 | Senior notes | Period commencing in 2025                    
Debt Instrument [Line Items]                    
Debt redemption percentage 100.00%