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Debt (Schedule of Debt) (Details) - USD ($)
1 Months Ended 12 Months Ended
Nov. 30, 2019
May 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Oct. 31, 2018
Sep. 30, 2017
Aug. 31, 2017
Mar. 01, 2017
Feb. 28, 2017
Nov. 30, 2016
May 31, 2016
Mar. 31, 2015
Debt Instrument [Line Items]                          
Total debt     $ 11,428,000,000 $ 11,747,000,000                  
Finance leases     127,000,000                    
Capital leases       122,000,000                  
Less short-term portion     (997,000,000) (903,000,000)                  
Long-term debt     10,431,000,000 10,844,000,000                  
Loss on extinguishment of debt     61,000,000 0 $ 54,000,000                
Accounts receivable securitization facility expiring 2019 | Line of credit                          
Debt Instrument [Line Items]                          
Total debt     929,000,000 850,000,000                  
Borrowing capacity, net of letters of credit     $ 46,000,000                    
Interest rate at December 31, 2019     2.60%                    
Average month-end debt outstanding     $ 915,000,000                    
Weighted-average interest rate on average debt outstanding     3.10%                    
Maximum month-end debt outstanding     $ 967,000,000                    
$3.75 billion ABL facility expiring 2024 | Line of credit                          
Debt Instrument [Line Items]                          
Total debt     1,638,000,000 1,685,000,000                  
Borrowing capacity, net of letters of credit     2,045,000,000                    
Letters of credit     $ 56,000,000                    
Interest rate at December 31, 2019     3.10%                    
Average month-end debt outstanding     $ 1,601,000,000                    
Weighted-average interest rate on average debt outstanding     3.70%                    
Maximum month-end debt outstanding     $ 1,727,000,000                    
Term loan facility expiring 2025                          
Debt Instrument [Line Items]                          
Total debt     $ 979,000,000 988,000,000                  
Debt repayment installment rate     1.00%                    
Term loan facility expiring 2025 | Line of credit                          
Debt Instrument [Line Items]                          
Borrowing capacity, net of letters of credit     $ 0                    
Interest rate at December 31, 2019     3.50%                    
Average month-end debt outstanding     $ 993,000,000                    
Weighted-average interest rate on average debt outstanding     4.00%                    
Maximum month-end debt outstanding     $ 998,000,000                    
4 5/8 percent senior secured notes due 2023 | Senior notes                          
Debt Instrument [Line Items]                          
Total debt     $ 0 994,000,000                  
Stated interest rate     4.625%                    
5 3/4 percent senior notes due 2024                          
Debt Instrument [Line Items]                          
Loss on extinguishment of debt   $ (32,000,000)                      
5 3/4 percent senior notes due 2024 | Senior notes                          
Debt Instrument [Line Items]                          
Total debt     $ 0 842,000,000                  
Stated interest rate     5.75%                    
5 1/2 percent Senior Notes due 2025 | Senior notes                          
Debt Instrument [Line Items]                          
Total debt     $ 795,000,000 794,000,000                  
Stated interest rate     5.50%                    
4 5/8 percent Senior Notes due 2025 | Senior notes                          
Debt Instrument [Line Items]                          
Total debt     $ 742,000,000 741,000,000                  
Stated interest rate     4.625%                    
5 7/8 percent Senior Notes due 2026 | Senior notes                          
Debt Instrument [Line Items]                          
Total debt     $ 999,000,000 999,000,000                  
Stated interest rate     5.875%                    
6 1/2 percent Senior Notes due 2026 | Senior notes                          
Debt Instrument [Line Items]                          
Total debt     $ 1,089,000,000 1,087,000,000                  
Stated interest rate     6.50%                    
5 1/2 percent Senior Notes due 2027 | Senior notes                          
Debt Instrument [Line Items]                          
Total debt     $ 992,000,000 991,000,000                  
Stated interest rate     5.50%                    
3 7/8 percent senior secured notes due 2027 | Senior notes                          
Debt Instrument [Line Items]                          
Total debt     $ 741,000,000 0                  
Stated interest rate 3.875%   3.875%                    
4 7/8 percent Senior Notes due 2028 | Senior notes                          
Debt Instrument [Line Items]                          
Total debt     $ 1,652,000,000 1,650,000,000                  
Stated interest rate     4.875%                    
Loss on extinguishment of debt $ 29,000,000                        
4 7/8 percent Senior Notes due 2028 | Senior notes                          
Debt Instrument [Line Items]                          
Total debt     $ 4,000,000 4,000,000                  
Stated interest rate     4.875%                    
5 1/4 percent Senior Notes due 2030 | Senior notes                          
Debt Instrument [Line Items]                          
Total debt     $ 741,000,000 $ 0                  
Stated interest rate     5.25%                    
Subsidiaries | 5 1/2 percent Senior Notes due 2025 | Senior notes                          
Debt Instrument [Line Items]                          
Debt instrument, face amount                         $ 800,000,000
Subsidiaries | 4 5/8 percent Senior Notes due 2025 | Senior notes                          
Debt Instrument [Line Items]                          
Debt instrument, face amount             $ 750,000,000            
Subsidiaries | 5 7/8 percent Senior Notes due 2026 | Senior notes                          
Debt Instrument [Line Items]                          
Debt instrument, face amount                   $ 250,000,000   $ 750,000,000  
Subsidiaries | 6 1/2 percent Senior Notes due 2026 | Senior notes                          
Debt Instrument [Line Items]                          
Debt instrument, face amount           $ 1,100,000,000              
Subsidiaries | 5 1/2 percent Senior Notes due 2027 | Senior notes                          
Debt Instrument [Line Items]                          
Debt instrument, face amount                 $ 1,000,000,000.0 $ 250,000,000 $ 750,000,000    
Subsidiaries | 3 7/8 percent senior secured notes due 2027 | Senior notes                          
Debt Instrument [Line Items]                          
Debt instrument, face amount $ 750,000,000                        
Subsidiaries | 4 7/8 percent Senior Notes due 2028 | Senior notes                          
Debt Instrument [Line Items]                          
Debt instrument, face amount               $ 925,000,000          
Subsidiaries | 4 7/8 percent Senior Notes due 2028 | Senior notes                          
Debt Instrument [Line Items]                          
Debt instrument, face amount             $ 750,000,000            
Subsidiaries | 5 1/4 percent Senior Notes due 2030 | Senior notes                          
Debt Instrument [Line Items]                          
Debt instrument, face amount   $ 750,000,000