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Debt (Schedule of long-term debt instruments) (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Feb. 28, 2019
Dec. 31, 2018
Oct. 31, 2018
Debt Instrument        
Finance leases $ 119,000,000      
Capital leases     $ 122,000,000  
Total debt 11,606,000,000   11,747,000,000  
Less short-term portion (930,000,000)   (903,000,000)  
Total long-term debt 10,676,000,000   10,844,000,000  
Term loan facility expiring 2025        
Debt Instrument        
Long-term Debt $ 986,000,000   988,000,000  
Annual repayment rate 1.00%      
Line of Credit        
Debt Instrument        
Maximum borrowing capacity       $ 1,000,000,000
Line of Credit | $3.0 billion ABL Facility expiring 2024        
Debt Instrument        
Long-term Debt $ 1,516,000,000   1,685,000,000  
Borrowing capacity, net of letters of credit 2,176,000,000      
Letters of credit $ 45,000,000      
Interest rate at March 31, 2019 3.90%      
Average month-end debt outstanding $ 1,609,000,000      
Weighted-average interest rate on average debt outstanding 4.00%      
Maximum month-end debt outstanding $ 1,691,000,000      
Maximum borrowing capacity   $ 3,750,000,000    
Senior notes | 4 5/8 percent Senior Secured Notes due 2023        
Debt Instrument        
Long-term Debt $ 994,000,000   994,000,000  
Stated interest rate 4.625%      
Senior notes | 5 3/4 percent Senior Notes due 2024        
Debt Instrument        
Long-term Debt $ 842,000,000   842,000,000  
Stated interest rate 5.75%      
Senior notes | 5 1/2 percent Senior Notes due 2025        
Debt Instrument        
Long-term Debt $ 794,000,000   794,000,000  
Stated interest rate 5.50%      
Senior notes | 4 5/8 percent Senior Notes due 2025        
Debt Instrument        
Long-term Debt $ 741,000,000   741,000,000  
Stated interest rate 4.625%      
Senior notes | 6 1/2 percent Senior Notes due 2026        
Debt Instrument        
Long-term Debt $ 999,000,000   999,000,000  
Stated interest rate 5.875%      
Senior notes | 6 1/2 percent Senior Notes due 2026        
Debt Instrument        
Long-term Debt $ 1,087,000,000   1,087,000,000  
Stated interest rate 6.50%      
Senior notes | 5 1/2 percent Senior Notes due 2027        
Debt Instrument        
Long-term Debt $ 992,000,000   991,000,000  
Stated interest rate 5.50%      
Senior notes | 4 7/8 percent Senior Notes due 2028        
Debt Instrument        
Long-term Debt $ 1,651,000,000   1,650,000,000  
Stated interest rate 4.875%      
Senior notes | 4 7/8 percent Senior Notes due 2028        
Debt Instrument        
Long-term Debt $ 4,000,000   4,000,000  
Stated interest rate 4.875%      
Line of Credit | Accounts Receivable Securitization Facility expiring 2018        
Debt Instrument        
Long-term Debt $ 881,000,000   $ 850,000,000  
Borrowing capacity, net of letters of credit $ 23,000,000      
Interest rate at March 31, 2019 3.40%      
Average month-end debt outstanding $ 860,000,000      
Weighted-average interest rate on average debt outstanding 3.40%      
Maximum month-end debt outstanding $ 882,000,000      
Collateral amount 922,000,000      
Line of Credit | Term loan facility        
Debt Instrument        
Borrowing capacity, net of letters of credit $ 0      
Interest rate at March 31, 2019 4.20%      
Average month-end debt outstanding $ 997,000,000      
Weighted-average interest rate on average debt outstanding 4.30%      
Maximum month-end debt outstanding $ 998,000,000