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LONG-TERM DEBT - Schedule of Debt (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Feb. 05, 2019
Dec. 31, 2018
LONG-TERM DEBT AND LEASE OBLIGATIONS      
Finance leases and mortgage notes $ 473   $ 500
Unamortized issue costs and note discounts (183)   (184)
Total long-term debt 14,972   14,826
Less current portion 158   182
Long-term debt, net of current portion 14,814   14,644
5.500% due 2019      
LONG-TERM DEBT AND LEASE OBLIGATIONS      
Interest rate, stated percentage   5.50%  
7.500% due 2022      
LONG-TERM DEBT AND LEASE OBLIGATIONS      
Interest rate, stated percentage   7.50%  
6.250% due 2027      
LONG-TERM DEBT AND LEASE OBLIGATIONS      
Interest rate, stated percentage   6.25%  
Senior Notes | 5.500% due 2019      
LONG-TERM DEBT AND LEASE OBLIGATIONS      
Carrying amount $ 0   468
Interest rate, stated percentage 5.50%    
Senior Notes | 6.750% due 2020      
LONG-TERM DEBT AND LEASE OBLIGATIONS      
Carrying amount $ 0   300
Interest rate, stated percentage 6.75% 6.75%  
Senior Notes | 8.125% due 2022      
LONG-TERM DEBT AND LEASE OBLIGATIONS      
Carrying amount $ 2,800   2,800
Interest rate, stated percentage 8.125%    
Senior Notes | 6.750% due 2023      
LONG-TERM DEBT AND LEASE OBLIGATIONS      
Carrying amount $ 1,872   1,872
Interest rate, stated percentage 6.75%    
Senior Notes | 7.000% due 2025      
LONG-TERM DEBT AND LEASE OBLIGATIONS      
Carrying amount $ 478   478
Interest rate, stated percentage 7.00%    
Senior Notes | 6.875% due 2031      
LONG-TERM DEBT AND LEASE OBLIGATIONS      
Carrying amount $ 362   362
Interest rate, stated percentage 6.875%    
Senior Notes | 4.750% due 2020      
LONG-TERM DEBT AND LEASE OBLIGATIONS      
Carrying amount $ 500   500
Interest rate, stated percentage 4.75%    
Senior Notes | 6.000% due 2020      
LONG-TERM DEBT AND LEASE OBLIGATIONS      
Carrying amount $ 1,800   1,800
Interest rate, stated percentage 6.00%    
Senior Notes | 4.500% due 2021      
LONG-TERM DEBT AND LEASE OBLIGATIONS      
Carrying amount $ 850   850
Interest rate, stated percentage 4.50%    
Senior Notes | 4.375% due 2021      
LONG-TERM DEBT AND LEASE OBLIGATIONS      
Carrying amount $ 1,050   1,050
Interest rate, stated percentage 4.375%    
Senior Notes | 4.625% due 2024      
LONG-TERM DEBT AND LEASE OBLIGATIONS      
Carrying amount $ 1,870   1,870
Interest rate, stated percentage 4.625%    
Senior Notes | 7.500% due 2022      
LONG-TERM DEBT AND LEASE OBLIGATIONS      
Carrying amount $ 0   750
Interest rate, stated percentage 7.50%    
Senior Notes | 5.125% due 2025      
LONG-TERM DEBT AND LEASE OBLIGATIONS      
Carrying amount $ 1,410   1,410
Interest rate, stated percentage 5.125%    
Senior Notes | 6.250% due 2027      
LONG-TERM DEBT AND LEASE OBLIGATIONS      
Carrying amount $ 1,500   0
Interest rate, stated percentage 6.25%    
Letter of Credit Facility      
LONG-TERM DEBT AND LEASE OBLIGATIONS      
Carrying amount $ 190   $ 0