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CONDENSED CONSOLIDATING FINANCIAL INFORMATION - Condensed Consolidating Balance Sheets (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Assets [Abstract]        
Total current assets $ 356 $ 491    
Investments in consolidated subsidiaries 0 0    
Total property, plant and equipment, net 4,538 6,352    
OTHER ASSETS 80 115    
TOTAL ASSETS 4,974 6,958    
Liabilities and Equity [Abstract]        
Total current liabilities 543 709    
LONG-TERM DEBT 4,860 4,877    
DEFERRED GAIN AND ISSUANCE COSTS, NET 135 146    
OTHER LONG-TERM LIABILITIES 715 720    
Amounts due to (from) affiliates 0 0    
Mezzanine equity 816 802    
Total equity [1] (2,095) (296) $ (289) $ (247)
TOTAL LIABILITIES AND EQUITY 4,974 6,958    
Eliminations        
Assets [Abstract]        
Total current assets (7) (13)    
Investments in consolidated subsidiaries (4,435) (6,179)    
Total property, plant and equipment, net 0 0    
OTHER ASSETS 0 0    
TOTAL ASSETS (4,442) (6,192)    
Liabilities and Equity [Abstract]        
Total current liabilities (7) (13)    
LONG-TERM DEBT 0 0    
DEFERRED GAIN AND ISSUANCE COSTS, NET 0 0    
OTHER LONG-TERM LIABILITIES 0 0    
Amounts due to (from) affiliates 0 0    
Mezzanine equity 0 0    
Total equity (4,435) (6,179)    
TOTAL LIABILITIES AND EQUITY (4,442) (6,192)    
Parent | Reportable Legal Entities        
Assets [Abstract]        
Total current assets 9 8    
Investments in consolidated subsidiaries 4,304 5,956    
Total property, plant and equipment, net 25 35    
OTHER ASSETS 1 1    
TOTAL ASSETS 4,339 6,000    
Liabilities and Equity [Abstract]        
Total current liabilities 139 248    
LONG-TERM DEBT 4,860 4,877    
DEFERRED GAIN AND ISSUANCE COSTS, NET 135 146    
OTHER LONG-TERM LIABILITIES 158 167    
Amounts due to (from) affiliates 1,230 951    
Mezzanine equity 0 0    
Total equity (2,183) (389)    
TOTAL LIABILITIES AND EQUITY 4,339 6,000    
Combined Guarantor Subsidiaries | Reportable Legal Entities        
Assets [Abstract]        
Total current assets 289 436    
Investments in consolidated subsidiaries 131 223    
Total property, plant and equipment, net 4,039 5,846    
OTHER ASSETS 65 82    
TOTAL ASSETS 4,524 6,587    
Liabilities and Equity [Abstract]        
Total current liabilities 404 469    
LONG-TERM DEBT 0 0    
DEFERRED GAIN AND ISSUANCE COSTS, NET 0 0    
OTHER LONG-TERM LIABILITIES 553 549    
Amounts due to (from) affiliates (1,232) (953)    
Mezzanine equity 0 0    
Total equity 4,799 6,522    
TOTAL LIABILITIES AND EQUITY 4,524 6,587    
Combined Non-Guarantor Subsidiaries | Reportable Legal Entities        
Assets [Abstract]        
Total current assets 65 60    
Investments in consolidated subsidiaries 0 0    
Total property, plant and equipment, net 474 471    
OTHER ASSETS 14 32    
TOTAL ASSETS 553 563    
Liabilities and Equity [Abstract]        
Total current liabilities 7 5    
LONG-TERM DEBT 0 0    
DEFERRED GAIN AND ISSUANCE COSTS, NET 0 0    
OTHER LONG-TERM LIABILITIES 4 4    
Amounts due to (from) affiliates 2 2    
Mezzanine equity 816 802    
Total equity (276) (250)    
TOTAL LIABILITIES AND EQUITY $ 553 $ 563    
Maximum        
Condensed Balance Sheet Statements, Captions [Line Items]        
Percentage of holding assets by subsidiaries in consolidated assets 1.00%      
[1]
The above tables exclude amounts related to redeemable noncontrolling interests reported as mezzanine equity. See Note 6 Joint Ventures for more information.