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Debt (Schedule of long-term debt instruments) (Details) - USD ($)
1 Months Ended 3 Months Ended
Feb. 29, 2020
Mar. 31, 2020
Dec. 31, 2019
Debt Instrument      
Finance leases   $ 146,000,000 $ 127,000,000
Total debt   11,597,000,000 11,428,000,000
Less short-term portion   (854,000,000) (997,000,000)
Total long-term debt   10,743,000,000 10,431,000,000
Term loan facility expiring 2025      
Debt Instrument      
Long-term debt   $ 977,000,000 979,000,000
Annual repayment rate   1.00%  
Line of Credit | $3.75 billion ABL Facility expiring 2024      
Debt Instrument      
Long-term debt   $ 1,179,000,000 1,638,000,000
Maximum borrowing capacity   3,750,000,000.00  
Borrowing capacity, net of letters of credit   2,508,000,000  
Letters of credit   $ 52,000,000  
Interest rate at March 31, 2020   2.20%  
Average month-end debt outstanding   $ 1,097,000,000  
Weighted-average interest rate on average debt outstanding   2.70%  
Maximum month-end debt outstanding   $ 1,494,000,000  
Senior notes | 5 1/2 percent Senior Notes due 2025      
Debt Instrument      
Long-term debt   $ 795,000,000 795,000,000
Stated interest rate   5.50%  
Senior notes | 4 5/8 percent Senior Notes due 2025      
Debt Instrument      
Long-term debt   $ 743,000,000 742,000,000
Stated interest rate   4.625%  
Senior notes | 5 7/8 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   $ 1,089,000,000 1,089,000,000
Stated interest rate   6.50%  
Senior notes | 5 1/2 percent Senior Notes due 2027      
Debt Instrument      
Long-term debt   $ 993,000,000 992,000,000
Stated interest rate   5.50%  
Senior notes | 3 7/8 percent Senior Secured Notes due 2027      
Debt Instrument      
Long-term debt   $ 741,000,000 741,000,000
Stated interest rate   3.875%  
Senior notes | 4 7/8 percent Senior Notes due 2028      
Debt Instrument      
Long-term debt   $ 1,653,000,000 1,652,000,000
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%  
Senior notes | 5 1/4 percent Senior Notes due 2030      
Debt Instrument      
Long-term debt   $ 742,000,000 741,000,000
Stated interest rate   5.25%  
Senior notes | 4 percent Senior Notes due 2030      
Debt Instrument      
Long-term debt   $ 741,000,000  
Stated interest rate   4.00%  
Line of Credit | Accounts Receivable Securitization Facility expiring 2020      
Debt Instrument      
Long-term debt   $ 795,000,000 $ 929,000,000
Borrowing capacity, net of letters of credit   $ 62,000,000  
Interest rate at March 31, 2020   2.10%  
Average month-end debt outstanding   $ 804,000,000  
Weighted-average interest rate on average debt outstanding   2.40%  
Maximum month-end debt outstanding   $ 811,000,000  
Collateral amount   857,000,000  
Line of Credit | Term loan facility      
Debt Instrument      
Borrowing capacity, net of letters of credit   $ 0  
Interest rate at March 31, 2020   2.70%  
Average month-end debt outstanding   $ 987,000,000  
Weighted-average interest rate on average debt outstanding   3.20%  
Maximum month-end debt outstanding   $ 988,000,000  
Subsidiaries | Senior notes | 4 percent Senior Notes due 2030      
Debt Instrument      
Debt instrument, face amount $ 750,000,000    
Proceeds from debt, net of issuance costs $ 741,000,000    
Subsidiaries | Redemption Period Two | Senior notes | 4 percent Senior Notes due 2030      
Debt Instrument      
Debt instrument, redemption price, percentage 104.00%    
Debt instrument, redemption price, percentage of principal amount redeemed 40.00%    
Subsidiaries | Redemption Period Three | Senior notes | 4 percent Senior Notes due 2030      
Debt Instrument      
Debt instrument, redemption price, percentage 101.00%    
Minimum | Subsidiaries | Redemption Period One | Senior notes | 4 percent Senior Notes due 2030      
Debt Instrument      
Debt instrument, redemption price, percentage 102.00%    
Maximum | Subsidiaries | Redemption Period One | Senior notes | 4 percent Senior Notes due 2030      
Debt Instrument      
Debt instrument, redemption price, percentage 100.00%